1934-46

1938 GMC 1/2 Ton Engine

Tuesday, March 20th, 2012

It’s 1938 and the GMC division of General Motors is entering its third year of small truck production.  Prior to 1936, the GMC line consisted of only larger trucks normally bought by businesses and government agencies for heavy hauling.  The Great Depression was in full swing and GMC needed more sales to add to their financial bottom line.  To help sales and even save some of their dealers from bankruptcy, GMC began to market light trucks in 1936.

When GMC developed their first 1/2 and 3/4 ton pickups (T14 and T16), they had no smaller engines that would fit these light weight trucks.  They wanted no part of using the low oil pressure six cylinder engine in the Chevrolet trucks.  Knowing their own small light weight full oil pressure six cylinder was under development (to be introduced in 1939) they had to find a temporary engine.

The answer was in the Oldsmobile Division.  Their strong inline six cylinder flat head engine was just what GMC needed.  It was used for the three years prior to the introduction of GMC’s own overhead valve full pressure engine in 1939.

One exception to this rule was in the 1/2 ton 1938 pickup.  Possibly for economic reasons, the Pontiac inline six cylinder flat head engine was used in the small 1/2 ton during 1938.  It was hoped this would lower the retail price on the 1/2 ton just enough to help GMC dealers better compete with the small pickup competition that were all fighting for the limited sales during the depression years.

The following two photos show a rebuilt 1938 GMC engine owned by Ron Loos of Redding, California.  This Pontiac engine will soon be returned to his 1938 GMC.  The most interesting part of this engine block is the Pontiac Indian head crest cast in the right side.  GMC used it just as they bought it from the Pontiac Division of General Motors in 1938!

Photos by Ron Loos, Redding, CA

1938 GMC 1/2 Ton Engine 1938 GMC 1/2 Ton Engine

1941 – 1946 Chevy / GMC Steering Wheel

Wednesday, December 21st, 2011


We have received so many requests over the years for the 1940 – 1946 Chevrolet / GMC steering wheels, we decided to make an exact replica. They are now finished and soon to be shipped from the factory. These steering wheels are complete with correct metal internal parts, non-metal exterior with ridges, and even the two proper colors available 65 years ago.

The result is a show quality copy of the GM original steering wheels. We already have complete the horn parts that fit in the steering wheel hubs.

To go directly to the steering wheel on our website, please click the buy parts now button.

1939-46 1/2 Ton Suburban/Panel Gas Tanks

Tuesday, November 29th, 2011


The gas tanks are totally different on the more common pickup versus the panel truck/suburban bodie, though the two frame rails, drive train, and front sheet metal are the same on each 1939-46 ½ ton.

On pickups the 18 gallon tank sets comfortably and safely within the seat riser and below the seat cushion. Over a million of these pickups were sold during this production period.

The panel truck and suburban were totally different animals. They had no protective seat riser. In fact, there was not even a passenger seat in most panel trucks. For protection, their 16 gallon gas tank was placed inside of the right frame rail and under the body. This gives the tank the safety of the frame rail and being in front of the rear axle. In the attached photos, the totally different shape is quite obvious.

In the following photos, the totally different shape of the panel truck and Suburban gas tank is quite obvious.

Gas tank removed from a 1941 panel truck.

1939-46 1/2 Ton Suburban/Panel Gas Tanks 1939-46 1/2 Ton Suburban/Panel Gas Tanks
1939-46 1/2 Ton Suburban/Panel Gas Tanks 1939-46 1/2 Ton Suburban/Panel Gas Tanks
Under the seat tank (usually on smaller trucks)

Chevrolet Engine Oil Pump Screens

Thursday, October 27th, 2011

In the days when car and truck owners as well as mechanics did maintenance, GM made these responsibilities much less complicated.  An excellent example was the screen below the engine oil pump.

Due to no oil filters and no detergent additive in the motor oil (to keep dirt in suspension), the oil pump screen was necessary.  Tiny dirt particles settled to the bottom of the oil pan as was expected.  The small dirt particles finally became dirt chunks stuck to the bottom of the oil pan.

GM wanted no chance that a chunk or clot of dirt might be drawn to the pump.  Thus, oil pulled into the pump had to pass through this screen.

These photos show several early screens used by various Chevrolet six cylinder engines.  Note the used screen on the 1937-53  216 engine.  Its rounded screen is held in place by a single wire.  The wire can easily be unhooked from the housing.  The screen then drops out for easy cleaning.

Chevrolet Engine Oil Pump Screens
1929-36
Chevrolet Engine Oil Pump Screens Chevrolet Engine Oil Pump Screens
1937-53 wire holding screen 1937-53 wire unhooked to remove screen

An Inner-Line Oil Filter

Monday, October 10th, 2011

An Inner-Line oil filter from Long Island, New York!  Rarely seen today but a popular early aftermarket option.  It secures to the engine block after removing the oil distribution cover.  No oil lines.  No moving the horn forward to make room for the intake manifold mounted oil canister.

Inner-Line Oil Filter Inner-Line Oil Filter
Inner-Line Oil Filter

Mice Love Old Chevy Trucks

Wednesday, September 21st, 2011

Short of cats? When older vehicles are left unattended, mice find a way to get inside. It’s their natural instinct! The damage they do with their families over a few years is a disaster to metal. They don’t seem to leave the nest when their bladder says “it’s time”.

This nest was recently found inside a 1941 Chevrolet ½ ton door when the inside panel was removed. There it was as you see it, the past home for many generations of mice. They must have damaged many surrounding textile items to gather this size of a nest.

Mice Love Old Chevy Trucks Mice Love Old Chevy Trucks

See below this 1940 Chevy upper air dam under the hood and floorboard section in front of the seat riser. What a perfect place for a mouse house. Out of the reach of cats, hawks, snakes, wind and rain! The little guys just keep bringing in more nesting materials. They make more and more babies and of course we know what else they do that rusts out the sheet metal.
Mice Love Old Chevy Trucks

1941 Chevrolet Panel Truck Interior

Friday, September 9th, 2011

I found these pictures among some papers stored 16 years ago. The owner of this 1941 panel truck is forgotten, however it is understood why these pictures were taken and placed in storage. Even that long ago, a very original ’41 panel was almost never found.

In this case, it was the interior that was the attention getter. Yes, the inside had been repainted. That was the easy part! It is the seat, bedwood, and storage compartment lid that are so pure. The seat is not only 1941, but the upholstery is very important. It is the same as when it came off the assembly line. Even the threads are still secured well to the vinyl panels. A unique small storage compartment in the floor to the right of the seat has a wood lid! Could this be due to cost cutting on a lower production work vehicle? Yes, it is the correct cover!

The wood planks in the bed from the rear of the seat panel to the back door are black, not varnished. Note: The metal bed strips. The two outer ridges extend slightly above the wood surface. This protects the wood from being continually rubbed by sliding miscellaneous boxes.

For the perfectionist, these photos are proof of how it was when the dealer offered the panel trucks 70 years ago!

1941 Chevrolet Panel Truck
Driver’s seat in correct position
1941 Chevrolet Panel Truck
Bottom side of wood toolbox lid.
1941 Chevrolet Panel Truck
Right side of driver’s seat.
1941 Chevrolet Panel Truck
Wood toolbox lid beside toolbox.
1941 Chevrolet Panel Truck
Driver’s seat moved forward. Dangerous during stops. Hauled merchandise can slide forward pinning driver to steering wheel.
1941 Chevrolet Panel Truck
Wooden lid (with finger hole) over toolbox. On right side of drivers seat. Covered if there is an optional passenger seat.

1937 to Early 1938 Chevrolet /GMC Gas Tank and Seat Cushions

Monday, August 22nd, 2011

So unusual to place a gas tank under the seat with no fill pipe outside the cab! To engineer this big change for 1937 was expensive and very different from earlier years when it was under the bed. Why was this done? What advantages could this have been over an outside fill spout? Was gasoline theft during the depression years a big problem?

To add gasoline on a 1937, the right lower cushion half was raised up toward the back which exposed the threaded ‘bung’ on the surface of the tank. It meant a person stood outside by the right side of the cab, raised the cushion half and added fuel. This is how it was done! If it was raining or snowing, the driver or the attendant stood there fueling. Maybe you kept an umbrella stored in this small cab for emergencies. Maybe gas station employees knew that when a 1937 Chevrolet or GMC truck drove in to get gas in the rain, a raincoat was needed. If some gasoline was spilled while filling, the vapor was smelled throughout the cab. If you were a cigarette smoker, well—–!!!

We were fortunate to recently obtain a set of 1937 original seat cushions. Even the upholstery on the two lower halves was still intact. The non-spout gas tank from the same truck came in the set.

Before they were requested by a serious collector, pictures had to be taken. Finding a pure set again in one place would probably be impossible.

An interesting feature is the plywood bottom on the right side removable cushion. The rectangular hole in the plywood prevented the springs from ever sagging and touching the electric gas sending unit. This must have been placed there to also protect the gas tank and bung from contact with a passenger’s weight on the seat. Engineers knew that a spark from an electric short near gas vapor would be a disaster!

We think these photos will be very interesting to the 1937 GM truck enthusiast. This way of tank filling continued into early 1938. Probably during the depression years, the manufacturer used their extra bodies and tanks that were left over from 1937 until supplies were depleted. Of course, this changeover would vary depending on the assembly plant.

The in- cab gas tank is also unique. It lies neatly inside the seat riser. The twist cap (bung) hole for adding fuel is at least 10′ away from the sending unit (protection from a gasoline pump add nozzle). For some reason the tank is built with two drain holes. One is always plugged and therefore the tank can be used in two type cabs. Maybe the gasoline outlet is different for right or left hand drive trucks!

Both Cushions have original upholstery Easily removable wood bottom half cushion. Note: the 2 small blocks to keep cushion secure on the seat riser.
Open spring half cushion for driver Both cushions raised above gas tank.
Plywood notch fits above gasoline sending unit. Sending unit in place.
Gasoline add bung and adjacent air vent. Open bung during refueling.
Top of tank. Note: Sending unit, bung, and air vent. Bottom of tank. Note: 2 Gas outlets.

Speedometers to Go…

Monday, August 15th, 2011

Rebuilt Speedometers for Chevy Trucks & GMC Trucks


Quality Rebuilt Speedometers

When your older truck needs a rebuilt speedometer, think of us! Our company, in combination with a local specialized shop, provides a quality product that you will be proud to place in your vehicle.

With most new repair parts, no longer available, we obtain used speedometers from across the country. Only the best parts are removed. These are combined with available new components to create a quality finished product. The following photos show various stages in the repair process.

Speedometers

Work Bench

Parts Inventory

Finished Products

1941-1946 Park light and Headlight Assemblies

Monday, June 20th, 2011


At the beginning of the 1941 Chevrolet and GMC truck body style, the parking light assembly was placed on top of the headlight bucket.  This was the first time both were placed on the fender as a pair.  All worked well together.  To save tooling costs, GM chose to add a pre-existing assembly from the year before on the 1940 Pontiac car.  No changes were made from this Pontiac park light assembly except its long sheet metal top was now painted and not chromed.

Overseas during World War II, when civilian front fenders were used on GM military trucks (instead of the more famous flat fender ‘army truck’ style) General Motors created a parking light that emitted a small strip of light to be seen at a shorter distance.

Beginning in 1942 and continuing through mid 1947 (when this body design was discontinued), GM used a much less expensive park light housing on civilian trucks.  A one piece stamped metal cover was attached to the headlight bucket for a fraction of the cost as in 1941.  This also used a smaller less expensive glass lens.

Therefore during this 6 ½ year truck production (1941-Mid 1947) the same headlight buckets were on Chevrolet and GMC trucks.  The difference was their hole punching which adapted to changes in parking light assemblies.

1942-45 Military

1942-45 Military

NOTE:   THE 1941 PHOTO WILL FOLLOW SOON

1936-37 GMC Grills

Wednesday, April 27th, 2011


What a rare occurrence! At the 2011 America Truck Historical Society Convention in South Bend, Indiana, we found both a 1936 and a 1937 restored GMC truck with the correct grill — each at different booths. You can go to every truck show for many years and never see even one. Therefore, we just had to get a few photos and make some comments. After all, this may never happen again.

The 1936 grill consists of seven vertical .3′ wide hollow chrome bars all the same size. The length is 25 1/4′. The notches in the receiving die cast pieces (hold the verticals in place) in the top and bottom are the same for each bar.

By 1937-38 there was a change in the center vertical bar. It became wider. It changed from .3′ in 1936 to .625′. It was also tapered back to align with the positioning of the other side bars. The overall length was shortened to 24′.

The notches in the die cast top and bottom receiving pieces are therefore different due to the width change in the center bar. They may look the same on the outside but are not where they attach to the vertical bars. See photo. Chrome was not used to add to the appearance. These bars were painted silver.


1936 GMC Grill

1937 GMC Grill

1937 upper grill bar extension front view

1937-38 bottom view

1936 1/2 Ton Wheels

Wednesday, March 30th, 2011


General Motors was coming out of the wire wheel era by 1936. This as well as wood spokes had been a standard with most cars and light trucks since the beginning at the turn of the century. The new stamped steel wheels on Chevrolet 1/2 tons were easier to produce, and was less susceptible to side damage on rough terrain or in an accident.

We find that both 17′ design 1/2 ton wheels were available in 1936, the transition year. In 1935 all 1/2 ton used wires and all 1937′s had stamped steel wheels.

The two attached photos are Chevrolet promotional pictures from 1936. These 1/2 tons are the same except for the wheels.

NOTE: GMC’s first entry into the 1/2 ton market was 1936. These used the new stamped steel artillery wheels like the later 1936 Chevrolet.

Technical Articles

Friday, March 18th, 2011

Over the many years we have collected a wealth of knowledge working with Chevrolet and GMC trucks from the years 1934 – 1972. We have gathered our Tech Articles, write-ups and how to’s and divided them into categories. You will find a list of helpful Articles that will help you get your old truck looking and running like new again.

1934, 1946 Chevy, GMC Trucks 1947, 1955 Chevy & GMC Trucks 1955, 1966 Chevy & GMC Trucks 1967, 1972 Chevy & GMC Trucks

Jim Carter Truck Parts….

Your #1 Source for 1934 – 1972 Chevy & GMC Truck Parts!

1938 Complete Wood Bed

Wednesday, March 2nd, 2011



In the Chevrolet truck assembly plant in Petone, New Zealand near the capital city of Wellington, a bed was not part of the pickup. This was in the 1930′s through mid 1940′s. The reason was to keep cost lower and to sell more trucks. The two rear fenders were wired flat to the frame for the new owner’s future use. This new owner could then have a deck or bed of his choice made locally. Most were made as a flat platform.

Robert O’Keeffe of Wanganui, New Zealand decided he wanted a bed on the 1938 pickup he was restoring like those seen on US trucks. He went a little further than many restorers. As a woodworker, he decided to make a ‘total’ wood bed and even use an exotic wood!

Check these photos. Rob is obviously a woodworking artist. The truck is a ‘head turner’ at any show.

What a project!

With the interest he received from the recent article on our website, he is considering offering these wood beds to others. The price in US dollars will be about $4,000.00 but this depends on the year and length.

Rob even knows a special freight company that sends merchandise weekly from only New Zealand to Los Angeles by ship. They arrange all truck line connections. The low price is surprising!

You can contact Rob @ okjoiner@xtra.co.nz

1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed 1938 complete wood bed

 

1934-1936 Side Mount Spare Tire

Friday, December 17th, 2010



During the early years, most roads were not paved and the quality of tires was far from that of today. Thus, tire repair was very big business. It was necessary for vehicle manufacturers to provide the easiest access to the often needed spare tire. Part of driving a car or truck was knowing how to change a tire.

On the 1936 and older light trucks, the tire storage space was limited. GM chose to place a well in the front fender and a long vertical rod from the frame rail to the cowl for the tire and wheel support clamp. A long nut is threaded to the top of the rod and tightens a curved metal.

This nut could be quickly removed by the wheel lug nut wrench. The tire and wheel was then quickly removed from the fender well.

Replacement hard parts for this side mount system are not being reproduced. Originals must be restored. The rubber grommet that protects the cowl and fender metal from the side mount hardware is available from Jim Carter Truck Parts along with a few other full stocking dealers.

NOTE: The Chevrolet 1/2 ton (1934-1936) placed the well in the right front fender. The 1936 GMC (first year for the 1/2 ton) was in the left front fender. The support hardware is the same. Just another way of the two marquis showing their individuality with limited expense.

1934 1936 side mount spare tire

1934 1936 side mount spare tire

1934 1936 side mount spare tire

1934-1936 Vacuum Wiper Motor

Friday, December 17th, 2010



This little vacuum wiper motor has such a unique appearance! They have become quite rare in recent years.

Manufactured by Trico for just this truck, it fits above the windshield frame on the left side of cab. A dealer accessory for the right side.

They have sometimes been called a “sweetheart” wiper motor due to their strange appearance.

1934-1936 vacuum wiper motor

1934-1936 vacuum wiper motor

Lost Engine Numbers

Thursday, February 11th, 2010

GM trucks titled prior to the mid-1950′s were usually registered using the stamped engine number not the body digits pressed in the door ID plate. This practice has created many problems in later years as states became stricter in titling.

Unfortunately, many older vehicles outlast their engine and owners rarely rebuild the originals. To save time and certainly expense, a rebuilt unit or a used one from another vehicle would often be installed. This worked great until years later when state safety inspections began or the vehicle was sold out of state. With a prior engine transplant, there was no ID numbers that would match the title.

Even today, this problem occurs as older trucks with different engines are pulled out of barns and from the property line of a farmer’s back field.

Lost Bumper Bolt

Thursday, February 11th, 2010

On 1937-55 1/2 and 3/4 ton rear bumpers there exists an unused center square bumper bolt hole that sometimes brings up questions from restorers. “Why does this hole exist and what is it purpose?” The answer relates to the attitude toward trucks during those years. They were for work and keeping their production cost low was a priority.

The bumpers during 1937-47 were the same front and rear. The center hole at the front held a vertical steel bracket which was needed if the truck was hand cranked. Rather than make a 4 hole rear bumper, GM simply used their front on the rear. Even in 1947-55 with a slightly different horizontal shape, the factory 5 hole punch was used on front and rear. Therefore, the rear bumper hole has no purpose. To cover this hole, GM produced a special bumper bolt that has become very rare. To save costs (it is a surprise that anything was used) GM created a one inch long stud held in place with a sheet metal speed nut. It has no threads and its head is covered with a stainless cap so it looks like the other bumper bolts from a distance.

Most of these original rare filler bolts will have dents and scrapes on the stainless cap. A skilled person can place a new stainless cover from a more common replacement bolt and make this rare unit look like new.

lost bumper bolt

GMC Long Bed

Thursday, February 11th, 2010

Of the many differences between the Chevrolet and GMC 1/2 ton during the early years (1936-54), the GMC offering of a long bed pickup box was one of the more noticeable. Only GMC provided this option. To obtain this extra bed length on a Chevrolet, the buyer ordered a 3/4 ton.

This difference existed with the first GMC pickup in 1936 and continued through the end of the Advance Design series in 1955. Possibly the reasoning for this was the horsepower difference between these two marquis. The base 216 six cylinder Chevrolet engine provided 92 hp. The standard 228 GMC six boasted 100 hp.

To get the approximately nine inch extra GMC chassis length not only were the two frame rails longer but the drive shaft was extended. GMC engineers did this by developing an extension which was the connecting length between the standard short bed closed drive shaft and the rear of the transmission. None of this interchanges with a Chevrolet and both makes use a totally different drive shaft design on their 3/4 ton series.

The adjacent photo shows this unique connector link installed in its GMC. A 7 3/8 inch steel jack-shaft is surrounded by a cast iron housing (it is still a closed drive shaft) and includes an extra u-joint, bearing, and seal. Though, a strongly built drive shaft system, this portion becomes the long bed 1/2 ton’s weak link after 50 years of use and abuse. Without a doubt this link has performed almost flawlessly beyond the miles expected by its designers. However, it does have its long term limitations. The many prior miles, lack of regular maintenance, and occasionally overloading the truck makes the failure of an original in today’s world a definite possibility. Watch for sources for the rare replacement parts in this connector link just in case. Otherwise surprise damage in this area can keep your GMC 1/2 ton long bed out of service for quite some time.

long bed 1

long bed 2

long bed 3

Home Made Garage

Thursday, February 11th, 2010

When you would like to restore your truck and no workshop is available, there is a solution. Most all the repairs can occur in a temporary shop and at a very low cost.

Jim Valano of Marion, Indiana is a true example of ‘American Ingenuity.’ He purchased a ‘canvas storage tent’ and assembled it at a convenient location. He even made the floor using the backside of used carpet on top of sheet plastic. Its roll-up sides are adjusted for the weather.

Jim’s 1957 Chevrolet ½ ton is now almost restored and most of the work occurred in this canvas enclosure. It can later be removed and stored in the original box.

If you need a building for your restoration, this may be your answer. Just check with your city for possible zoning restrictions!

home made garage 1

home ,ade garage 2

home made garage 3

First GMC Light Duty Pick Up Truck

Thursday, February 11th, 2010

Prior to the mid-1930′s, the two truck divisions of General Motors, Chevrolet and GMC, were mostly independent companies. If you wanted a 1-1/2 ton and smaller truck, Chevrolet (since 1918) could provide the model just right for your needs. If you needed a 2-ton and larger, GMC was the division to contact. They had been a large truck specialist even before 1920.

A gradual overlap began in mid-1936 with the introduction of the new “low cab” body. GMC brought out a line of light trucks in direct competition with Chevrolet. They were to give the current GMC dealerships additional sales by fulfilling their customer’s light duty hauling needs. These new trucks shared most sheet metal with Chevrolet as well as transmissions, front suspension, wheels and differentials. A few minor changes were the grille, hood sides, lettered tailgate and hubcaps; however, the major difference was the engine.

At that time GMC did not produce a small engine that could fit their new light duty trucks. Their totally new small six-cylinder overhead valve power plant was still three years away. The solution was to use a pre-existing engine from one of the General Motors other divisions. They adopted the 213 cubic inch six-cylinder flat head engine from Oldsmobile. Its power, size and reliability in cars made it the best choice and replacement parts were already available from the Oldsmobile division.

This proven engine in combination with the new low cab body proved successful and allowed GMC to begin gaining ground in the small truck market.

This 213 full oil pressure insert bearing engine (updated by Oldsmobile in 1937 to 230) was main source of power during the early years of smaller GMC trucks, 1936-38. One exception was in the half-ton pickup in 1938. For this model and year only GMC now used a different smaller flat head six-cylinder. It came from the Pontiac car division and is said to even have the Pontiac Indian head symbol cast in the right side of the engine block. It had 223 cubic inches. The 230 was retained on GMCs larger than 1/2-tons.

Few of these light duty GMC survive today. They not only experienced the usual heavy work jobs as trucks, but with World War II new truck shortages meant few GMCs were set idle in storage.

first gmc light duty 1

1937 GMC, Drawing by Bryant Stewart, farley, MA.

first gmc light duty 2

1936 GMC
(Photo compliments of Patrick Kroeger at dv200@aol.com)
Not to be used without written permission.

Demise of the GM Panel Truck

Thursday, February 11th, 2010

Even before the 1920′s, light commercial hauling using panel trucks had found a loyal growing customer base. With increasing numbers of small businesses and the population gradually moving to the cities, the panel truck found a place in our society. By the 1930′s, most all truck manufacturers had designed a panel body to fit on their existing pickup truck chassis.

Advantages of the panel over other trucks for small business are numerous. Their weather-tight body protects cargo from rain, snow, driving wind and summer sun. Very important is the security feature. Merchandise is out of sight and can be locked. They are economical over big trucks and much more maneuverable than the larger commercial vehicles. Panel trucks are just right for moving in crowded streets and narrow alleys.

demise panel truck 1

Retired panel trucks used for storage (above)

Even at the end of the panel truck’s life, auto wrecking yards often kept a few for storage. The bodies were excellent for protecting used parts (starters, generators, bearings, clutches, etc.) from the weather.

During the mid 1960′s, a major drop in panel truck popularity began. The vehicle that was once wanted by most every business in America was now being overlooked because of a ‘new kid on the block.’ The General Motors G-series van had arrived! This new van with short nose, had better turning radius, more cargo space on a like wheelbase, and a side freight door. It was the truck to buy. On most models the price was even lower.

The panel truck could not compete! It’s sales began dropping almost every year. Their popularity became so low that GM discontinued the vehicle even before the end of the 1967-1972 body style. This tells how the sales had dropped. Production was stopped even though the assembly line was operating and the tooling was able to continue stamping the body panels. In 1970, General Motors called it quits. The panel truck was history!

demise panel truck 2

1970 G Series Van (above)

With the major sales decline during the final years, you will see less of the 1967-70 units than of the earlier designs.

Even finding a rough final series panel is a rare occurrence. The newest is now over 30 years old. They were built for work responsibilities. Few were kept out of the weather. Most were owned by companies and driven by their employees.

demise panel truck 3

Believe It or Not

Thursday, February 11th, 2010

It’s the height of World War II. The Japanese have control of the rubber plantations in Indonesia. The few tires available are reserved for military use.  And, the rationing of gasoline stops most U.S. vehicle operation.  But, there were still trucks needed on farms, keeping telephone lines operational, and supplying store commodities for their city.  For these selected truck uses, new tires could sometimes be available.

What did individuals do with no replacement tires for their trucks and cars?

We have talked with several elderly people over the years.  They recall using real ‘American Ingenuity’ to keep tires on their limited-use vehicles.  It was called ‘booting’.  Essentially, they searched for non repairable tires in salvage yards.  Then, they removed the bead that touched the rim with a small hand saw.  The tread part was then wrapped around the mounted tire that was still holding air.  Wear stopped on the inner tire and the once worthless outer tire could now be placed back in service.

It was said to work well at slower speeds. This was a creative idea that helped keep our country mobile during a time of great sacrifices and shortages. Sorry, we wish we had a picture!

1941-1946 1 1/2 Ton Front Bumper

Thursday, February 11th, 2010

A major change in large truck Chevrolet front bumpers occurred during there years. Prior to 1946 the 1 1/2 ton bumpers and braces were little more that a heavier guage design of the smaller 1/2 ton.

The big bumper change was in 1946. (Possibly this was because Chevrolet introduced its first 2 ton model that year.) Now it was nothing like those on the 1/2 and 3/4 ton.

This new heavier, stronger bumper design continues on GM’s larger trucks to this day.

1941 front bumper

1941 Front Bumper (above)

1946 front bumper

1946 Front Bumper (above)

1939 Right Hand Drive

Thursday, February 11th, 2010

General Motors right hand drive trucks, though unusual in the United States, have always been very popular in specific countries such as Britain, New Zealand, South Africa, and Australia. These vehicles were not produced in the U.S. but came from GM’s large assembly plant in Oshawa, Ontario. Due to reversed dash boards, the change in steering components, differences in starter linkages, and tail light locations, etc., the lower numbers of right hand drive production was kept at this one Canadian assembly plant.

In New Zealand, special marketing laws required at least 25% of each new truck had to be assembled or produced in that country. This was mostly to help provide more local jobs. Thus for many years the GM Canadian facility exported truck parts only to the New Zealand assembly plant in Petone near the capital city of Wellington. Hundreds of freight containers supplying GM truck parts regularly arrived at this New Zealand assembly plant. The specialized parts from Canada were engines, frames, suspension components, disassembled cabs and front sheet metal. The New Zealand plant then assembled the truck and furnished parts they could provide locally. This included (at least in the 1940′s) the wiring harnesses, window glass, a wood cab floor, some rubber parts, an optional flat wood deck, etc.

To keep within the 25% government parts and labor requirement, a truck bed with sides as supplied on U.S. vehicles was not included. A locally made wood deck could be added during assembly. Either with or without this deck, the two rear pickup metal rear fenders from the Canadian plant were wired or otherwise secured at the rear of the cab. The finished vehicle was delivered this way to local New Zealand GM dealers. The lack of a bed would also allow the budget minded buyer to construct his own deck or hauling platform and better afford the new truck.

A New Zealand trailer manufacturer during these early years used pickup rear fenders on their finished product. Their small general purpose trailers were usually equipped with these new metal pickup fenders. A retired 88 year old manager of this company remembers having standing orders with all New Zealand pickup dealers (not just GM) to purchase their extras. This saved additional expense on their completed trailers.

The photos below are of three excellent 1939 Chevrolet 1/2 ton’s, all assembled at the New Zealand plant.

Their right hand drive feature is unique to American readers, however, these Chevrolets have another very unusual characteristic. As with most 1939 New Zealand Chevrolet trucks, their cab was assembled in the New Zealand Petone plant from pre-stamped pieces, and are a mixture of two types of trucks. The rear of the cabs and door outer sheet metal are of the U.S. 1936-1938 design. The cowl, windshield frame, hood and grill are the 1939-40 style. Yes, they do weld together nicely into a single unit but the horizontal door and hood lines do not match. Reasons for the GM ‘cab mixture’ are not known at this writing, however, it is assumed keeping New Zealand’s costs low was the main factor. Quantities of older 1936-38 style rear cabs, roofs, and door stampings were either already available or the prior tooling still had much remaining life. The lower cost could then be passed on to the retail truck buyer. Just another way of producing the New Zealand 1939 GM truck at the lowest possible price!

Another theory for this unusual combination cab is due to the beginning of World War II. Because of New Zealand’s connection with Great Britain, they entered the war September 2, 1939 over two years before the United States became formally involved. No doubt being in the war created an immediate demand for all trucks in New Zealand. Rather than lose sales while the cab tooling changeover occurred at the Canadian supply plant (1938 to the new design 1939 body) GM continued with the prior sheet metal for their in demand export truck. Exact new styling was not necessary to overseas buyers when the war demand was so high!

Truck #1 – Owned and restored by Steve Jones, Palmerston North, New Zealand

Contact Steve at chevytrucks49@e3.net.nz

A local newspaper ad brought Steve to this basically complete 1939 pickup. It had great potential for a complete restoration and was just what Steve had been wanting. It’s major two year rebuilding started in 1999 and most all work was done personally by the owner, Steve Jones. It is now authentically restored from the ground up. The only observable differences from its 1939 beginning are the addition of a non-New Zealand GM bed with sides and its whitewall tires. Steve even picked an original Chevrolet truck color, Armour Yellow.

One of Steve’s pictures, with this article, features the inside of the cab top without the headliner. Note: the factory welds where the early and late style sheet metal have been joined.

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive


Truck #2 – Owned and restored by Steve Bright, Feilding, New Zealand

This 1939 was bought new by Steve’s grandfather. He used it for it’s first five years on a rural mail delivery route (during World War II) as well as helping with the family sheep and cattle farm. After the war it continued with farm duties plus collected cream from surrounding dairies for a local butter factory. This was done until 1950 when this little ’39 had reached a mileage of 200,000. It was then used for the next 25 years by members of the family on the farm or for trips to town.

Retirement occurred in about 1978 when major mechanical problems developed. It was placed in a barn after having logged over 350,000 miles!! It sat in this same storage place until 1990, when Steve decided to give it a major restoration in honor of his grandfather.

He has now rebuilt it to look like it’s off the assembly line. All worn parts were repaired or replaced. The exception is the hand made bed built during the restoration which results in a longer overhang in the back. The tonneau cover protects the bed bottom and merchandise being transported.

Though the truck looks and drives almost new, it is not a “trailer queen”. Steve Bright has driven it 14,000 miles in the past six years.

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

Editors Note:The above trucks were closely observed and personally driven during a recent trip to New Zealand. Each has the same unique features, so it can be assumed, they are correct from the factory.

An additional feature of these New Zealand 1939 Chevrolets: The gas tanks were below the bed and cab from the factory, not under the seat as in the U.S.A. The right side of the cab is even notched out to allow the tank to fit higher above the ground.

Steve Bright’s truck still has the original tank. Steve Jones truck gas tank was missing so he placed a replacement unit under the seat as on U.S. built 1939′s.


Truck #3 – Owned and restored by Graham Stewert, Wyndham, New Zealand

Contact Graham at 2 R.D., Wyndham 9892, New Zealand

This little 1939 1/2 ton is on New Zealand’s South Island. Its owner, Graham Stewert, has personally given it a complete restoration with all parts disassembled and then put back in place. Other than engine rebuilding and body repair, the owner did the work!

Graham bought this 1/2 ton un-restored in 2003 with only 76,350 miles. It immediately caught his attention because it was the same as his grandfather bought new in 1939. He well remembers grandfather using it for regular deliveries by the family dairy to homes and a dairy processing plant.

Thus, he decided to build it “bone stock” in memory of his grandfather and how it looked in 1939.

It is now the exact color as grandfather’s 1939 and the engine, transmission, differential, and interior, etc. is like Graham remembers in his younger days. It runs like new and is a pleasure to drive for fun transportation as well as to many vintage auto rallies.

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1939 GMC Right Hand Drive

1937-1946 Deluxe Heaters

Thursday, February 11th, 2010

Keeping the passenger area warm in cars and trucks during the winter was always a problem in the early years. Not only were the heater fans and cores small but the vehicles used recirculator heaters. Thus, the air in the cab was recirculated rather than using dry outside cold air being brought inside and warmed. This helped for quicker warming but with more passengers, the additional humidity from breathing caused the windows to fog inside. A wiping cloth would have been needed to clear the windshield.

To address this issue, GM provided an extra feature with the pictured “deluxe” heater. A blower motor attached to the top of the standard heater made it a “deluxe” model. This separate optional motor on top forced warm air into the defroster nozzles and onto the windshield. There were two switches under the dash, one for each motor. In colder climates, it is doubtful the small heater core could supply warm air from the two motors both at the same time! Although this is antiquated by today’s standards, it did allow some relief on colder days.

GM Deluxe Heater 1
Optional Defroster Motor on Top-Estimated 1939
Front GM Deluxe Heater
1940-46
GM deluxe Heater 2
Air intake, back view ‘ Estimated 1939
GM deluxe Heater 2
1940-46
Optional Defroster Assembly- Estimated 1939
Optional Defroster Assembly- Estimated 1939

1940-46

1937-1938 Australian Half Ton

Thursday, February 11th, 2010

The Australian 1937-38 Chevrolet trucks are much like those in the U.S., however on close observation, one can certainly see unique differences. This United States relative is obviously GM but not quite the same.

These Down-Under truck’s final assembly point was in the Holden plant in New South Wales, Australia. (Holden is a branch for GM in that country.) Much of the sheet metal was stamped at the GM Canadian plant in Oshawa, Ontario. Most all the GM trucks in the 1930′s and 1940′s that reached overseas assembly plants were from this Canadian location but unassembled.

In Australia and even in nearby New Zealand, local governments required a certain percentage of truck parts to be manufactured in those countries. This provided jobs for the local population. Parts supplied in Australia would be wiring harnesses, glass, tires, seats, a different design bed, etc.

The current photos we have of Australian 1937-38 1/2 tons are these furnished by Luke Randall from auto gatherings in Eastern Australia. He owns a 1938 to be restored so he has an interest in others of this design. You can contact Luke at lukerandall@hotmail.com.

Items of special interest on these 1937 and 1938 Australian trucks are:

  • The 3 stamped ribs on the can roof
  • A different bed design
  • The wide horizontal panel below the door
  • The double stamped belt on the cowl and door stop near the handle (In the U.S. the belt continues around the cab beghind to the rear under the window)
  • The windshield is two piece not like the one piece 1937-1938 in the U.S.
  • Doors are more rounded at the top
  • Right hand drive

1937-1938 Chevrolet Half Ton

1937-1938 Chevrolet Half Ton 2

1937-1938 Chevrolet Half Ton 3

1937-1938 Chevrolet Half Ton 4

1937-1938 Chevrolet Half Ton 5

Luke and passenger

1937-1938 Chevrolet Half Ton 6

Luke’s 1938 to be restored

1936-1942 Coupe Pick Up

Thursday, February 11th, 2010

1936-1942 Chevy Coupe Pick Up

During the great depression of the 1930′s, almost half of the automakers ceased business forever. Most remaining manufacturers modified their vehicles and advertising techniques to appeal to a very conservative buyer. With limited disposable income the few people willing to purchase a car or truck were very careful.

To help boost or at least hold sales steady, the Chevrolet Division introduced a new model in 1936. It was referred to as the Coupe Pickup. With a small corporate investment a dual purpose vehicle was created to appeal to the buyer with a need for both a car and a pickup.

The new model was a standard coupe with a miniature pickup truck bed placed in the trunk area. This small new bed included wood planks, metal strips, sides, and tailgate much like larger ½ ton pickups. It extended out of the trunk about the distance of the rear bumper. To keep out dust and rain water, a custom made canvas snapped in place between the small bed sides and the coupe trunk edges.

To appeal to the conservative new car buyer during the depression years this vehicle even included a painted coupe deck lid wrapped in several coverings of butcher paper. In this way if the mini-bed was removed, the deck lid could be attached and the owner then had a car.

This unique model was available each year from 1936 through early 1942 when World War II stopped domestic car production. There is almost no survival of the original coupe pickups. The few that made it even to the 1950′s were almost always given their deck lid to transform them to a pure coupe. Few people wanted an older pickup with such limited hauling capacity when they could have a coupe with a somewhat youthful sporty appearance.

No doubt the major weakness of this model was the canvas between the bed and body. It soon deteriorated when the vehicle set outside leaving the trunk area exposed to rain and snow. This was just the beginning of major rust problems which in time totaled the trunk area and maybe even the complete vehicle!

Today, if one of these beds would appear at an antique auto swap meet, almost no one would remember it’s original application. When the Chevrolet lettering was not on the gate, most would pass by thinking it is probably home made for a forgotten use.

1936-1942 coupe puick up 1

1936-1942 coupe pick up 2

1936-1942 coupe pick up

1936-1942 coupe pick up

1934-1946 Truck Tech

Thursday, February 11th, 2010

1934-1946 Chevy Truck Model I.D.

We hope the following information on Axle, Transmission and Model identification will help many of you with your questions. Accuracy was a concern as we compiled this information. Because GM made so many scheduled as well as unscheduled changes, there is much discussion about these changes.

The following is used by permission from Pickups and Panels Magazine and artist Bryant J. Stewart

1934

Series DB…Wheelbase 112…1/2 ton pickup and canopy top pickup, panel, canopy express, spc. pickup/panel, chassis

Series PA/B…..Wheelbase 131..1 1/2 ton truck – single/dual wheels

Series PB…Wheelbase 131…1/2 ton pickup dual wheels

Series PC/D…..Wheelbase 157..1 1/2 ton truck – single/dual wheels

Series PD……Wheelbase 157….1 1/2 ton truck, dual wheels


1935

truck tech 1935

Series EB…Wheelbase…112…1/2 ton pick up panel,canopy express,suburban, spc, pickup/panel chassis and cab.

Series QA/B…..Wheelbase…131…1 1/2 ton truck single and dual wheels

Series QC/D…..Wheelbase…157…1 1/2 ton truck single and dual wheels


1936

truck tech 1936

Series FB…Wheelbase 112…1/2 pick up panel, canopy express, suburban, spc. pickup/panel, chassis and cab.

Series RA…..Wheelbase 131…1 1/2 ton truck single wheels

Series RB…Wheelbase 131…1 1/2 ton truck dual wheels.

Series RC…..Wheelbase 157…1 1/2 ton truck single wheels

Series RD…..Wheelbase 157…1 1/2 ton truck dual wheels


1937

Series GC…Wheelbase 112……1/2 ton pick up, panel, canopy express, suburban carryall, chassis and cab

Series GD…..Wheelbase 122-1/2……3/4 ton pick up, panel, flatbed, stake rack (11″ brakes)

Series GE…..Wheelbase 122-1/2……3/4 ton pick up, panel, flatbed, stake rack (14″ brakes)

Series SA/B…..Wheelbase 131-1/2…..1 1/2 ton chassis and cowl, open express, canopy express

Series SC/D…..Wheelbase 157……1 1/2 ton flatbed, stake rack, single/dual wheels


1938

Series HC…Wheelbase 112…………1/2 ton panel, canopy express, suburban

Series HD…..Wheelbase 120-1/4……3/4 ton pick up, panel, flatbed, stake rack, (11″ brakes)

Series HE…..Wheelbase 122-1/4……3/4 ton pick up, panel, flatbed, stake rack (14″ brakes)

Series TA…Wheelbase 131-1/2……..1 1/2 ton panel canopy express, flatbed, stake rack, single wheels

Series TB…..Wheelbase 131-1/2……1 1/2 ton panel, canopy express, flatbed, stake rack, dual wheels

Series TC…..Wheelbase 157……….1 1/2 ton flatbed, stake/stock dual wheels

Series TD…..Wheelbase 157……….1 1/2 ton flatbed, stake/stock dual wheels


1939

Series JC…Wheelbase 113-1/2………1/2 ton pick up, canopy express, panel, suburban

Series JD…..Wheelbase 123-3/4…….3/4 ton pick up, stake rack, panel, flatbed (11″ brakes)

Series JE…..Wheelbase 123-3/4…….3/4 ton pick up, panel, flatbed, stake rack, (14″ brakes) heavy duty

Series VA/B…..Wheelbase 133………1 1/2 ton panel, canopy express, flatbed, stake rack, single/dual wheels

Series VC/D…Wheelbase 158-1/2……..1 1/2 ton flatbed, stake/stock rack, single/dual wheels

Series VE/F…..Wheelbase 107-5/8……1 1/2 ton COE flatbed, stake rack single/dual wheels

Series VG/H…..Wheelbase 131-1/8……1 1/2 ton COE flatbed, stake rack single/dual wheels

Series VM/N…..Wheelbase 156-5/8……1 1/2 ton COE m-single/n-dual wheels


1940

Series KC…..Wheelbase 113-1/2………1/2 ton pick up, panel, canopy express, suburban

Series KD…..Wheelbase 123-3/4………3/4 ton pick up, stake rack, panel, flatbed (11″ brakes)

Series KE…..Wheelbase 123-3/4………3/4 ton pick up, panel, flatbed, stake rack (14″ brakes) heavy duty

Series KF…..Wheelbase 133………….1 ton panel

Series WA…..Wheelbase 133………….1 1/2 ton panel, canopy express, flatbed, stake rack, single/dual wheels

Series WB…..Wheelbase 158-1/2………1 1/2 ton flatbed, stake/stock rack, single/dual wheels

Series WC…..Wheelbase 193-5/8………School Bus chassis, dual wheels

Series WD…..Wheelbase 107-5/8………1 1/2 ton COE flatbed, stake rack

Series WE…..Wheelbase 131-1/8………1 1/2 ton COE flatbed, stake rack

Series WF…..Wheelbase 156-5/8………1 1/2 ton COE flatbed, stake rack


1941

truck tech 1941

Series AK…..Wheelbase 115………….1/2 ton pick up, panel, canopy express, suburban

Series AL…..Wheelbase 125-1/4………3/4 ton pick up, panel, flatbed, stake rack (11″brakes)

Series AM…..Wheelbase 125-1/4………3/4 ton pick up, panel, flatybed, stake rack (14″ brakes) heavy duty

Series AN…..Wheelbase 134-1/2………1 ton panel

Series YR…..Wheelbase 134-1/2………1 1/2 ton flatbed, canopy express, flatbed, stake rack, single/dual wheels

Series YS…..Wheelbase 160………….1 1/2 ton flatbed, stake/stock rack, single/dual wheels

Series YT…..Wheelbase 195………….School Bus chassis, dual wheels

Series YU…..Wheelbase 109………….1 1/2 ton COE flatbed, stake rack

Series YV…..Wheelbase 132-1/2………1 1/2 ton COE flatbed, stake/stock rack

Series YW…..Wheelbase 158………….1 1/2 ton COE flatbed, stake rack


1942

Series BK…..Wheelbase 115………….1/2 ton pick up, panel, canopy express, suburban

Series BL…..Wheelbase 125-1/4………3/4 ton pick up, panel, flatbed, stake rack (11″ brakes)

Series BM…..Wheelbase 125-1/4………3/4 ton pick up, panel, flatbed, stake rack, (14″ brakes) heavy duty

Series BN…..Wheelbase 134-1/2………1 ton panel, canopy express, flatbed, stake rack

Series MR…..Wheelbase 134-1/2………1 1/2 ton panel, canopy express, flatbed, stake rack, single/dual wheels

Series MS…..Wheelbase 160………….1 1/2 ton flatbed, stake/stock rack , single/dual wheels

Series MY…..Wheelbase 160………….1 1/2 ton school bus chassis

Series MT…..Wheelbase 195………….1 1/2 ton school bus chassis

Series MU…..Wheelbase 109………….1 1/2 ton COE

Series MV…..Wheelbase 132-1/2………1 1/2 ton COE flatbed, stake rack

Series MW…..Wheelbase 158………….1 1/2 ton COE flatbed, stake/stock rack


1946

truck tech 1946

Series 1st CK 2nd DP…..Wheelbase 115………..1/2 ton pick up, panel, canopy express, suburban (1st only)

Series 1st DR…………Wheelbase 125-1/4…….3/4 ton pick up, panel, flatbed, stake rack

Series 1st DS…………Wheelbase 134-1/2…….1 ton pick up, panel, flatbed, stake rack

Series 1st OR 2nd PJ…..Wheelbase 134-1/2…….1 1/2 ton panel, canopy express, flatbed, stake rack

Series 1st OS 2nd PK…..Wheelbase 160………..1 1/2 ton flatbed, stake/stock rack

Series 1st OW 2nd PL…..Wheelbase 160………..1 1/2 ton school bus chassis

Series 1st OY…………Wheelbase 195………..1 1/2 ton school bus chassis

Series 1st OE 2nd PV…..Wheelbase 134-1/2…….1 1/2 ton flatbed, stake rack

Series 1st OF 2nd PW…..Wheelbase 160………..1 1/2 ton flatbed, stake/stock rack

Series 1st OG 2nd PX…..Wheelbase 195………..2 ton school bus chassis

Series 1st OH 2nd PP…..Wheelbase 109………..2 ton COE flatbed, stake rack

Series 1st OI 2nd PR…..Wheelbase 132-1/2…….2 ton COE flatbed, stake/stock rack

Disclaimer: This truck I. D. information is correct and complete to the best of our knowledge and is only to be used as a guide. Pickups ‘n panels and/or the National Chevy/GMC Truck Association, and Jim Carter Truck Parts, make no guarantee of accuracy, and disclaim any liability incurred in the use of this information.

Buy Parts for 1934 to 1946 Trucks

 

1918-1933 Truck Tech

Thursday, February 11th, 2010

1918-33 Chevy Truck Model I.D.

We hope the following information on Axle, Transmission and Model identification will help many of you with your questions. Accuracy was a concern as we compiled this information. Because GM made so many scheduled as well as unscheduled changes, there is much discussion about these changes.

The following is used by permission from Pickups and Panels Magazine and artist Bryant J. Stewart

1918-1933 truck tech

1918

Series 490…Wheelbase 102…1/2 ton light delivery chassis, wagon

Series T…..Wheelbase 125…1 ton worm drive chassis, flare board and curtain top express


1919

Series 490…Wheelbase…102…1/2 ton light delivery chassis, wagon.

Series T…..Wheelbase…125…1 ton worm drive chassis, flare board and curtain top express


1920

Series 490…Wheelbase 102…1/2 ton light delivery chassis, delivery wagon 1 and 3 seat

Series T…..Wheelbase 125…1 ton chassis and cowl, flare board and covered flare express


1921

Series 490…Wheelbase 102…1/2 ton chassis and cowl, open express, covered express 3 seat

Series G…..Wheelbase 120…3/4 ton chassis and cowl, open express, canopy express

Series T…..Wheelbase 125…1 ton chassis, open express, canopy express, canopy express 3 seat


1922

truck tech 1922

Series 490…Wheelbase 102…1/2 ton panel delivery, station wagon

Series G…..Wheelbase 120…3/4 ton cowl cab chassis, express, canopy express

Series T…..Wheelbase 125…1 ton chassis, open express, canopy express, canopy curtain express


1923

Series A/B…Wheelbase 103…1/2 ton chassis, canopy express, panel, station wagon

Series D…..Wheelbase 120-5..1 ton chassis, stake, utility express, delivery, cattle body


1924

Series B/F…Wheelbase 103…1/2 ton chassis, light delivery, panel

Series D/H…Wheelbase 120…1 ton chassis, stake, flare board express, dump, enclosed cab


1925

Series F…..Wheelbase 103…1/2 ton chassis, light delivery (early 1925)

truck tech 1925

Series H…..Wheelbase 120…1 ton chassis (earlt 1925)

Series K…..Wheelbase 103…1/2 ton chassis, light delivery (late 1925)

Series M…..Wheelbase 120…1 ton chassis (late 1925)


1926

Series K…..Wheelbase 103…1/2 ton chassis, light delivery (early 1926)

Series R…..Wheelbase 124…1 ton chassis (early 1926)

Series V…..Wheelbase 103…1/2 ton chassis, light delivery (late 1926)

truck tech 1926

Series X…..Wheelbase 124…1 ton chassis, springfield suburban, screenside, stake rack (late 1926)


1927

Series V…..Wheelbase 103…1/2 ton chassis, light delivery (early 1927)

Series X…..Wheelbase 124…1 ton chassis, springfield suburban, screenside (early 1927)

Series AA….Wheelbase 103…1/2 ton chassis, light delivery (late 1927)

Series LM….Wheelbase 124…1 ton chassis, panel delivery, stake bed (late 1927)


1928

Series AB….Wheelbase 107…1/2 ton chassis, pick up, canopy, panel, screenside and sedan delivery, roadster pick up

Series LO….Wheelbase 124…1 ton panel delivery, stake bed, chassis


1929

truck tech 1929

Series AC….Wheelbase 107…1/2 ton chassis, pickup, canopy, panel, screenside and sedan delivery

Series LQ….Wheelbase 131…1 and 1 1/2 ton chassis


1930

Series AD….Wheelbase 107…1/2 ton chassis, delivery, canopy, deluxe, panel, roadster, screenside, sedan

Series LR….Wheelbase 131…1 1/2 ton truck 1st half

Series LS….Wheelbase 131…1 1/2 ton truck 2nd half


1931

truck tech 1931

Series AE….Wheelbase 109…1/2 ton open/closed cab chassis/puickup, panel, canopy express

Series LT….Wheelbase 131-157…1 1/2 ton truck-single and dual wheels 1st half

Series MA/B…Wheelbase 131…1 1/2 ton truck-single and dual wheels 2nd half

Series MC/D…Wheelbase 157…1 1/2 ton truck-single and dual wheels 2nd half


1932

Series BB….Wheelbase 109….1/2 ton closed cab pickup and canopy top pickup, panel,open and closed cab canopy express, spc. sed. delivery/panel/chassis

Series NA/B..Wheelbase 131….1 1/2 ton truck- single/dual wheels

Series NC/D..Wheelbase 157….1 1/2 ton truck – single and dual wheels


1933

truck tech 1933

Series CB….Wheelbase 109….1/2 ton pickup and canopy top pickup, panel, open and closed cab canopy express, special pickup/panel chassis

Series OA/B..Wheelbase 131….1 1/2 ton truck – single and dual wheels

Series OC/D..Wheelbase 157….1 1/2 ton truck- single and dual wheels


Disclaimer: This truck I. D. information is correct and complete to the best of our knowledge and is only to be used as a guide. Pickups ‘n panels and/or the National Chevy/GMC Truck Association, and Jim Carter Truck Parts, make no guarantee of accuracy, and disclaim any liability incurred in the use of this information.

Screw On ID Plates

Thursday, February 11th, 2010

screw on ID plates

The body I.D. plate – every GM truck had one attached at the factory. Basically it states the vehicle’s gross weight limit (weight of truck plus its maximum allowed load) plus stamped digits that give the assembly plant year, size of truck, month built, and sequential numbers as it came off the production line. These plates are necessary for positive vehicle identification.

A unique characteristic of the 1950 and older GM truck is that the I.D. plate was not riveted at the factory but rather held in place by two small clutch head screws with a hexagon perimeter. Thus a wrench or a clutch driver can tighten or remove them.

Over the years if the two screws begin to loosen, the owner would either retighten them from time to time or often remove the plate for safe keeping. Usually this plate stayed in the glove box or at home and just never got reattached. Thus we find some of these pre-1951 GM trucks with no I.D. plates. In the early years this was often of little concern as most trucks were titled on the engine number.

After 1950 these I.D. Plates were riveted to the door post. Probably not so much to prevent vehicle theft (we lived in a different era) but just to keep them from being lost.

In today’s world this can cause big problems in registering particularly if the transfer is to another state and an I.D. number verification is necessary. Even if the I.D. plate remains secure with screws as it left the factory, a problem may still exist. Unfortunately most inspectors today weren’t even born when these trucks were built. Sometimes an officer refuses to OK the truck, saying that I.D. plates do not come with attaching screws and it is not legal. You now have an uphill battle with an inspector that really believes he is correct.

Yes, you can attach this original scratched and painted-over I.D. plate with rivets. However, what is this inspector going to say when he sees this worn and painted on I.D. plate attached with two new shinny pop rivets? Have you ever been accused of car theft? It is then you wish the truck was titled to the engine!

Remember, on a left hand drive truck (1947-55) the I.D. plate attached to the left door post. It is attached to the opposite side on the right hand drive truck. The two holes for the plate screws or rivets are punched at the factory in both door posts.

Trees and Trucks

Thursday, February 11th, 2010

There couldn’t be an easier place for a tree to grow. If you don’t move your truck for a few years, trees will find it. As they grow wider, the truck bends to fit!

Here no one steps on a tree at the beginning. Lawn mowers can’t reach it.

It’s free to grow.

tree trucks 1

trees trucks 2

trees trucks 3

White Wall Tires

Thursday, February 11th, 2010

Prior to the 1960′s, trucks were used as work vehicles. On Friday nights, most were parked for the weekend and the family sedan was the transportation vehicle.

It was a conservative era when you bought only basic necessities. A $5.00 grocery purchase was more than most could carry. Finding white wall tires on a truck would have been a rare sight, indeed. Very few cars, except for most luxurious models, would have had white walls even as an option. It should be remembered, that most roads, except highways and those in the main part of town were gravel, dirt, or sprayed annually with tar.

Of course, a dealer would have been happy to install aftermarket white wall tires, if the customer made a specific request. For a price, the dealer would provide any option to keep a satisfied customer and make a few dollars.

On GM trucks, white walls became a factory option in mid-1955, partially because of the introduction of the Chevrolet Cameo and GMC Suburban carrier and also due to more roads becoming paved. These very deluxe pickups, as well as several of the other well appointed 1/2 tons justified a white wall tire for those wanting it all!

Almost none of these deluxe models would have been given their second set of white wall tires. By then, the pickup was older and being used more as a hauler, not for appearance.

Buy Parts for 1934 to 1946 Trucks

 

Wider Wheels on 3/4 Tons

Thursday, February 11th, 2010

When you need more room for wider 8 bolt non-split rim wheels on your stock 1946-1959 Chevrolet or GMC ¾ ton, there is a solution. (The long tie rod ends prevent the use of wheels much wider than the original split rims.) Customers have given us an answer! It is not difficult and uses all original GM parts.

After the left and right tie rod ends from a 1 or 1-1/2 ton. They are about one inch shorter. As their threads are reversed from the ¾ ton design (these replacement ends have male ends), you will need a tie rod from a 1 or 1-1/2 ton with female ends. Yes, they fit into the original arms beside the ¾ ton backing plates.

The tie rod ends are still available new, however, the long tie rod will need to be from a used truck. If you are lucky, the tie rod with ends will come together from the older truck. There is even a good chance the ends will be in great shape and won’t need replacing. If so, mark the position of the ends on the tie rod if you remove them. Another end can be replaced in the exact prior position. In this way your front suspension should stay in alignment and save you money and time in an alignment shop.

Note: If the used tie rod ends are good, remove the old grease. It probably contains road grit and will cause premature wear. Put some heat on the ends before adding new grease through the zirk fitting. This will soften the old grease. It will then come out when new lubricant is added under pressure.

Casting Numbers

Thursday, February 11th, 2010
Casting Number Make Year CID
1970 Chevrolet 1964-1967 292
2135412 GMC 1946-1954 248,270
2193980 GMC 1952-1954 302
2324003 GMC 1955-1963 270
2324004 GMC 1955-1962 302
2404929 GMC 1955-1963 270
2192402 GMC Military 302
289890 Chevrolet 1963-1977 292
328575 Chev/Buick/Olds/Pontiac 1968-1984 250
328576 Chev/Buick/Pontiac 1968-1976 250
328880 Chevrolet 1963-1977 292
329990 Chevrolet 1963-1977 292
358825 Chevrolet 1966-1976 250
3629703 Chevrolet 1950-1952 235
366855 Chev/Buick/Olds/Pontiac 1966-1984 250
3692703 Chevrolet 1950-1952 235
3692708 Chevrolet 1950-1952 235
3692713 Chevrolet 1950-1952 235
3693374 Chevrolet 1942-1949 235
37001481 Chevrolet 1953-1955 235
3701946 Chevrolet 1953 235
3703414 Chevrolet 1954-1956 261
3733340 Chevrolet 1955-1957 261
3733813 Chevrolet 1958 261
3733946 Chevrolet 1954-1955 235
3733949 Chevrolet 1953-1955 235
3733950 Chevrolet 1954-1955 261
3737012  Chevrolet 1955-1957 261
3738307  Chevrolet 1958-1962 235
3738365 Chevrolet 1960-1962 261
3738476 Chevrolet 1958-1962 235
3738813 Chevrolet 1955-1963 261
3739365 Chevrolet 1958-1962 261
3739716  Chevrolet 1958-1962 235
3759365  Chevrolet 1959 261
3764476  Chevrolet 1958-1962 235
3769716  Chevrolet 1958-1962 235
3769717  Chevrolet 1959-1962 261
3769925  Chevrolet 1958-1962 261
3773949  Chevrolet 1954 235
3782856  Chevrolet 1962-1967 194
3782858  Chevrolet 1962-1967 194
378307  Chevrolet 1960-1962 235
3783949  Chevrolet 1953-1954 235
3788378  Chevrolet 1962-1974 292
3788406  Chevrolet 1962-1969 230
3788514  Chevrolet 1962-1970 153
3788813  Chevrolet 1955-1959 261
3789404  Chevrolet 1963-1976 292
3789412  Chevrolet 1963-1966 292
3789716  Chevrolet 1963-1972 292
3792852  GMC 1962-1966 194
3792858  Chevrolet 1962-1967 194
3821970  GMC 1967-1972 292
3833057  Chevrolet 1962-1970 191
3833067  Chevrolet 1963-1970 194
3833340  Chevrolet 1955-1957 261
383340  Chevrolet 1955-1957 261
3835253  Chevrolet 1942-1953 216
3835309 Chevrolet 1942-1949 235
3835335  Chevrolet 1942-1949 235
3835353 Chevrolet 1948-1952 216
3835363  Chevrolet 1954 235
3835374  Chevrolet 1942-1949 235
3835491  Chevrolet 1954 235
3835497  Chevrolet 1942-1953 216
3835527  Chevrolet 1951 216
3835692 Chevrolet 1950-1952 235
3835794  Chevrolet 1942-1953 216
3835846  Chevrolet 1953 235
3835849  Chevrolet 1942-1953 216
3835894  Chevrolet 1953 216
3835911  Chevrolet 1953-1955 235
3835917  Chevrolet 1954-1955 235
3835946  Chevrolet 1953 235
3835949  Chevrolet 1954 235
3836012  Chevrolet 1955-1957 261
3836223  Chevrolet 1955-1957 235
3836233  Chevrolet 1955-1957 235
3836340  Chevrolet 1955-1958 261
3836386  Chevrolet 1955-1957 235
3837004  Chevrolet 1955-1957 235-261
3837012  Chevrolet 1955-1957 261
3843363  Chevrolet 1953-1955 235
3850817  Chevrolet 1962-1978 230-250
3851656  Chevrolet 1963-1972 292
3851659  Chevrolet 1963-1976 292
3851859  Chevrolet 1963-1972 292
3854036  Chevrolet/Olds/Pontiac 1962-1976 230-250
3855914  Chevrolet 1963-1966 292
3855987  Chevrolet 1963-1971 292
3855991  Chevrolet 1963-1970 230
3856233  Chevrolet 1955 235
3858190  Chevrolet 1954-1955 235
3877178  Buick/Olds/Chev/Pont/GMC 1962-1978 230-250
3879875  Chevrolet 1962-1970 194
3886061  Chevrolet 1963-1966 292
3890011  Buick/Chev/Olds/Pontiac 1968-1972 250
3890013  Chevrolet 1968-1972 250
3892858  Chevrolet 1964-1967 194
389770  Chevrolet 1942-1951 216
3897702  Chevrolet 1942-1953 216
3921770  Chevrolet 1966-1976 292
3921967  Chevrolet 1964-1969 230
3921968  Chevrolet 1964-1976 230-150
3921970  Chevrolet 1963-1976 292
828575  Chevrolet 1972-1977 250
837751  Chevrolet 1942-1949 235
839770  Chevrolet 1942-1953 216
8397715  Chevrolet 1942-1949 235
839910  Chevrolet 1942-1951 216
839931  Chevrolet 1942-1949 235
8994256  Chevrolet 1964-1977 292
9890043 Pontiac 1968-1969 250

Fan Blade Change

Thursday, February 11th, 2010

At the beginning years of the 216 engine (1937-1938) the fan blade that cooled the radiator was made with a center hub plus four blades. Each blade was attached to the hub with three rivets.

This combination worked well when new, however, it was certainly more expensive to produce. A dangerous part of the design was the blades attached by rivets. Rain water while driving and sometimes a leaking radiator allowed dampness to get between the blades where they overlapped the center hub. As rust continued, the chance of a blade coming loose increased. Even with deterioration, the four blades stayed in balance while the vehicle was moving. Then all #*!# broke loose when a blade went through the hood, radiator, or where-ever!

A new design fan was introduced in 1939 and used through all the remaining 216 years and early 235 year, 1954. This blade was used on Chevrolet cars and pickup trucks. It is simply two identical blades welded together that held tight against the water pump with four fasteners. Much less expensive to produce and so much safer!!!

fan blade

Close-Up of 1937-1938 Fan Blade with Rivets. (above)

fan blade

1937-1938 Fan Blade with rivets. (above)

fan blade

Close-Up of the new improved safer 1939-1954 Fan Blade (above)

fan blade

1939-1954 Fan Blade (above)

1936 – 1946 Engine Dust Pans…Pure GM

Thursday, February 11th, 2010

1936 - 1946 GM

During the 1930′s and 1940′s our Nations roads were dirt and gravel. Paving had been underway for many years but there was still a long way to go.

To protect engine componants from a constant attack of dirt, GM designed metal stamped panels that attached to an area where the engine block and oil pan connect. This slowed dust from collecting on moving parts and for certain around the engine air breather.

1936 1946 engine dust pan 1936 1946 engine dust pan 1936 1946 engine dust pan 1936 1946 engine dust pan
1936
1936 ?
1937- 1938
1939-1946


Over the years, these gradually fell from their attaching fasteners and found their way to the roads. Potholes and ruts were often the culprits. The vehicle owners and even hired mechanics tended to remove them during maintenance. They were rarely paced back into position.

Today finding a pair of these engine dust pans is almost impossible. Newer generations have no knowledge of their existance. These photos of the different years should be about 1936 and 1946.

If someone is in disagreement on the years, email us at info@jimcartertruckparts.com

Early Gas Tank Changes

Thursday, February 11th, 2010

During the three years of this cab design, subtle changes occurred as GM engineers learned better ways to construct this truck. The gas tank changes on the pickup body style was probably the most obvious and it was different each of the three years.

In 1936, the new mid year low cab pickup continued with the earlier practice of securing the tank under the bed and behind the rear axle. The gas add spout extended through a hole in the lower bed side behind the right rear fender. Thought it might seem like a good location, it was not. Considering the trucks stiff suspension the poor roads of the 1930′s, and how rough trucks were treated, this location resulted in tanks leaks and cracked fuel lines that were over 6 feet from the engine.

The answer to this problem came out in the 1937 trucks. The tank was moved to the protected area under the cab seat cushion. This solved prior problems but the improvement did not go far enough. The fuel add hole was in the top of the tank on the passenger side. To gain access to the threaded plug to add fuel, the right side of a new split bottom cushion was raised or removed. Rain or shine, the passenger would stand outside and wait for fueling so the seat cushion could be replaced. Of course, any accidental spills or splashing from the spout would give fumes within the cab till the evaporation was complete. What if you lit a cigarette out of habit? What about a small electrical short under the dash? Your imagination can tell you what probably happened a few times over the years.

The engineers seem to have got it together in mid 1938. They redesigned the 1937 tank and cab so that gasoline was added through a spout that now extended out the cab corner. The bottom seat cushion was then one piece, however, for several months two piece bottoms were still used on the assembly line until supplies were exhausted. Therefore, the late 1938 tank was used less than one year and is very rare today. The new designed 1939 body style continued with this type tank and cab design but the 39 tank will not interchange in the earlier cab.

early gas tank changes 1

1937 ( above)

early gas tank changes 2

1937 (above)

early gas tank changes 3

1937 (above)

early gas tank changes 4

1937 (above)

early gas tank changes 5

1938 (above)

early gas tank changes 6

1938 (above)

early gas tank changes 7

Gas Spout Hole from Outside

early gas tank changes 8

Gas Spout Hole from Inside

Chevy and GMC Engines

Thursday, February 11th, 2010

Though the major cab and fender sheet metal change began in mid 1947 (Advance Design), both the Chevrolet and GMC trucks kept their same proven six cylinder engines as used in prior years.

The base engine in GMC light trucks was the 228 cubic inch inline six introduced in 1939. This overhead valve unit had a full pressure oil system with its rod and main bearings lubricated from drilled lines within the crankshaft. This high pressure is reflected on the dash gauge reading 0-50 pounds.

This family of engines during the Advance Design years also produced the 248 and 270 cubic inch units. The cylinder diameter in their main difference. They all share the same overhaul gaskets, water pumps, oil pans, distributors and side plates. On GMC, not Chevrolet, the cubic inch is the first three digits of the stamped serial number on the flat surface behind the distributor.

Chevrolet’s six cylinder used during most of the Advance Design years was very different from that in the GMC. Its standard 216 cubic inch engine was a result of continual improvements since the first Chevrolet six cylinder began in 1929. The 1940′s 216 truck engines were almost identical to that in the Chevrolet car. Therefore, millions of 216′s were on the road by the beginning of 1947. Their basic design and easy maintenance made them one of the greats in lower priced vehicles. When used on the roads of that era, they provided dependable service both on the farm and in the city.

The 216 was the standard power plant in the 3000 and 4000 series trucks. Its big brother, the 235 was optional on the 4000 series and standard on the 5000 and 6000 series. It is almost identical to the 216 but the increased displacement gave the needed extra power to work trucks. The 235 truck engine was not used in pickups, however, was matched to the Powerglide transmission cars with some modifications between 1950-53.

These 216 and early 235 are designed to operate without oil lines drilled in the crankshaft to lubricate their bearings.

The early 235 is not to be confused with the more famous later 235 full pressure engine first introduced in Powerglide Chevrolet cars and the Corvette in 1953. During this transition year trucks continued to have the lower pressure design. By 1954 the full oil pressure 235 became the standard of the Chevrolet fleet. It was modified for trucks by using solid valve lifters in place of the hydraulics in cars. The camshaft gear was changed from fiber to aluminum.

Closed Drive Shafts

Thursday, February 11th, 2010

Occasionally we hear owners condemning the closed drive shaft system used in the 1/2 ton trucks prior to 1955. After questioning the negative comment, we almost always discover the real criticism is the low gearing of the ring and pinion in the differential. Yes, this lower gear ratio was created more for slower roads of year gone by, but it is by far not a poorly designed system. In fact, it is questioned if there has ever been drive shaft and u-joint combinations that exceed the durability of this GM quality engineered closed unit.

Over 50% of the surviving older 1/2 ton pickups continue to use their original closed systems. Of these, the majority have had little or no servicing other than keeping lubrications in the transmission and differential.

Consider this when you realize the last GM closed drive shaft system was produced in 1954. Many others have been in irregular service prior to the 1920′s. Also remember that many 1/2 ton pickups were often given abuse far in excess of the manufacturer’s recommendations.

What modern open drive shaft system has been able to compare with this unsurpassed record? None!! Sure, the newer open u-joints are easier to change. They better be. They require attention or replacement so much more frequently!

Another Example of GM Quality!!!

We recently received the following comment from John Berkeley Ball. He also confirms the quality of the General Motor’s 1/2 ton closed drive shaft and differential.

Dear Jim Carter

Thanks for your excellent articles. One very pertinent point I feel that you should mention about closed drive shafts is their absolute impervability to rear spring wind up. Used on the farm over soft ground with heavy loads, you could not afford to send your rear end into drive breaking pulsations every time you lost traction, whether the shocks were worn out or not (some were single action any way). What a huge advantage over the Hotchkiss rear end! this is an often unknown design attribute that Chevy engineers were unfoundedly maligned for – at least by today’s city slickers…

John Ball

You may relate comments to this web site or Mr. Ball direct at john_ball@telus.net.

216 Oil Leaks

Thursday, February 11th, 2010

And now we’ve seen it all! A real example of American ingenuity.

Designed by an aftermarket company to keep an over tightened valve cover from leaking motor oil down the engine sides.  A metal band is pushed over and around the base of the valve cover.  Brass U-brackets are then secured by the two valve cover studs.  This creates equal pressure around the valve cover perimeter to stop the leaks down the side of the engine. 

Scott states he has seen these brackets on another 216 engine. Maybe a company in that area once offered them at local auto parts stores.

This photo was taken by Scott Golding, a resident of Western Nebraska.


216 Oil Leaks

E-mail scottandbetty@hotmail.com. Scott states he has seen these brackets on another 216 engine. Maybe a company in that area once offered them at local auto parts stores.

Your opinion is welcomed.

 

1937 or Older Chevrolet Pressure Plate

Thursday, February 11th, 2010

1937 Chevrolet

Rebuilding the 1937 and older pressure plate can be a little tricky. The early design (activated with a carbon throw out bearing under pressure) requires extra steps when being rebuilt. With the help of an older shop manual (see below) the final details can be successful.

The personal letter is from Richard Wright of Westtown, NY. He did not receive the necessary final touches in the rebuilding procedure and he made the final adjustments. Fortunately, the 1935 Chevrolet shop manual has a description of how to complete this procedure. The following letter, pictures and shop manual page should be of help in the rebuilding procedure. A more advanced pressure plate was introduced in 1938. A new diaphragm design then became a standard in Chevrolet for 30 years.

NOTE:

The “X” mark on the clutch cover should be lined up as near as is possible with the “X” mark on the flywheel. These “X” marks are balance marks.

Place clutch pilot tool, Fig.99 into position. This tool properly lines up to the disc so that when the transmission is assembled the splines on the main drive gear shaft will line up and enter easily the splines in the clutch disc.

Assemble the nine cap screws holding the clutch cover to the flywheel, tightening each one , one turn at a time until the cover is assembled into position. Remove the clutch disc aligning tool. Assemble throwout bearing sleeve.

CLUTCH LEVER HEIGHTS

It is very important that the clutch levers be of the same height to assure correct clutch operation. In addition to the clutch levers being the same height, the maximum run-out of the clutch throw-out bearing plate should not exceed .020″ when measured with an indicator guage placed on the clutch housing.

clutch adjustments 1937 chevrolet

The checking and correcting may be done after the transmission and clutch throw-out collar have been removed.

To check run-out, place the indicator guage on the clutch housing through the transmission hole as shown in Fig 100. Set the dial guage at zero and check run-out while turning engine. If run-out exceeds .020″ the high lever plate should be shimmed-up by placing a shim under each side of the plate at the attaching bolts, which will result in dropping the high finger. Connecting rod shims with the ends trimmed may be used.

REPLACEMENT OF TRANSMISSION

These operations are just the reverse of the removal operations. The tool shown in Fig 101 can be used to hold the universal joint rings in position while assembling the nuts.

1937 clutch adjustments chevrolet

CLUTCH PEDAL ADJUSTMENT

There are two very important adjustments to the clutch pedal. The first is for obtaining the proper clearance between the clutch pedal and the floor board and the second for obtaining 1″ of the pedal travel before the clutch begins to disengage. These two adjustments compensate for wear of the clutch parts, and if these two operations are performed when necessary, long trouble free clutch operation can be expected.

1937 clutch adjustments chevrolet

To obtain 1/2″ clearance between the clutch pedal and the floor board, loosen nuts “A” and “B” in Fig 102 and move the pedal stop either forward or backward until the clutch pedal clears the floor board 1/2″


1937 Chevrolet 1

1937 Chevrolet 2

1937 Chevrolet 3


Below is a letter from Richard Wright of Westtown, NY.

1937 Chevrolet 1937 Chevrolet

1938-1953 Clutch

Thursday, February 11th, 2010

Chevrolet introduced their basic nine inch single disc clutch and corresponding diaphragm pressure plate in 1938. This pair was used in their cars and most 1/2 ton pickups with three speed transmissions through 1953. With about one million of these vehicles sold annually, one can quickly realize the high numbers of this clutch system that was at one time on the highway.

Even in 1954 with the introduction of the larger ten inch clutch disc and modified pressure plate on the new 235 six cylinder, the original design continued to sell very well as aftermarket replacements. Today, they still have a strong demand even though the majority of these over fifty year old vehicles are history. Most auto part stores now keep a pair in inventory for their walk-in customers.

1938-1953 Clutch

To add even more validity to this clutch’s durability, GM reintroduced it in the late 1960′s. General Motors was a major producer of full size passenger buses and the demand for most having the optional air conditioning was becoming strong. Almost all new buses would now be equipped with the option. The original small nine inch clutch was combined with the newly engineered large bus AC compressor. Once again, this proven clutch was serving automotive needs!

Therefore, if you find a source for new or core clutch assemblies used from the late 1960′s to at least the mid 1970′s in GM buses, they will also fit 1938-53 cars and small trucks.

Ghost Windows

Thursday, February 11th, 2010

The door window is cranked up tight in the cloth channel and off you go on your daily errands. Suddenly, the glass begins to slowly lowers as you drive over side roads or contact a rough surface. In comes cold air, rain, and wind! Even the window handle turns. What’s this all about? Do you tape the window closed or wire the handle so it will not turn?

You have a window regulator spring problem! This large 2″ diameter round spring has either broken or become disconnected.

With no spring tension on the regulator, the weight of the glass creates the lowering of the support arm and window. Sorry, there is no good fix other than removing the regulator from inside the door. The picture below shows this circular Clock spring. It must be large to hold the weight of the glass panel.

ghost window

1939-1946 Electric Wiper Motor

Thursday, February 11th, 2010

electric wiper motor 1

1939-1946 Electric Wiper Motor

Even if you prefer an original vacuum wiper motor for these years rebuildable cores have become very rare and most New Old Stock units are just not obtainable. Even new ones have their lubrication dry after 70 years.

For those that won’t except a slow moving or non-working used vacuum unit, an alternative does exist. New electric motors are now on the market in both 6 and 12 volt styles. The above photo shows a new unit before installation.

You will no longer need the original inside wiper cover plate with the indention. Replace it with the included non-indented style which gives a smooth finish.

The electric wires can be run inside the windshield post to a switch of your choice under the dash.

These kits can be obtained from Jim Carter Truck Parts at 1-800-842-1913.

Swing Out Windshield

Thursday, February 11th, 2010

During the early years of auto and truck design, most vehicles came with their windshields capable of tipping outward. This helped poorly insulated cabs to be more bearable during hot weather. Extra outside air would be forced into the cab and replaced some of the hot air radiating from the bare sheet metal firewall.

This idea was good but not without a few problems. Unfortunately, air movement depended on the speed of the vehicle. The faster the driving, the more air circulation. Too bad for the driver in stop and go city traffic during a hot summer day.

In GM trucks, water leaks into the cab developed as the rubber edge seal began to age. The under dash crank-out gear assembly (1936-46) was not easily reached and therefore almost never received lubrication. The gear would wear and later most became non-usable. It was then necessary to close the windshield frame permanently and the cab lost a major method of getting air flow on hot days.

The system was expensive to produce! A pair of swing hinges, a crank-out assembly, and two windshield halves added to production costs.

This windshield vent system was stopped with the introduction of the 1947 Advance Design cab. The two piece windshield now became permanently sealed. An insulated interior fire wall pad was standard. A left side cowl vent intake door forced outside air over the drivers feet and lower legs. (Of course, this was also when the truck was moving.)

A top cowl vent door (also on earlier trucks) now had a screen to prevent entry of insects. Thus, this was the end of the swing-out windshield. They were a great help on hot days when the vehicle was moving, but inevitable gear wear began a new set of problems for later years.

1939-1946 Door Windows

Thursday, February 11th, 2010

During 1939-40 Door window breakage on truck cabs became a problem. As the cloth fabric in the door window channel became worn, the large and now loose fitting side windows were susceptible to cracking when the door was slammed. Complaints from dealers resulted in an improvement on 1941-46 doors. A one piece metal frame was placed around the edges of the top and sides of the glass and the breakage was greatly reduced. To make room for these new metal frames, the glass on the 1941-46 doors was now slightly smaller.

Therefore, the 1939-40 door glass and 1941-46 with metal frame will interchange in total in all 1939-46 doors. The smaller 1941-46 door glass can not be used without it’s frame or it will not seal into the cloth channel at the top of the window opening.

1939 door window

Motor Oil in Old Engines

Thursday, February 11th, 2010

Prior to the mid 1960′s, motor oil did not have the modern detergent additive. Therefore this type engine oil didn’t keep dirt particles in suspension. Foreign material would slowly settle to the bottom of the oil pan and on other flat surfaces such as the valley of the head.

If you ever removed an oil pan from a 50 year old engine that has been setting, chances are good there can be up to 1/4 inch of sludge in the bottom. This is not a bad thing! The non detergent oil has allowed the dirt to settle. As most 60 year old engines did not have an oil filter, this dirt settling was what should happen to increase the engine life.

The problem begins when a new owner wants to get his old vehicle running. He installs plugs, points, back-flushes the cooling system and changes oil. Oops, he probably adds detergent motor oil! The dirt deposits now begin to slowly go back into suspension. Unfortunately with no oil filter the dirt stays in the oil and shortens the remaining life of the engine.

Moral: Add non-detergent oil if the engine has no oil filter.

Muffler Tech

Thursday, February 11th, 2010

muffler tech

Prior to about 1962, Chevrolet trucks were equipped with round straight through mufflers. These units reduced back pressure and allowed the engine to breathe to its full potential. This caused a little extra exhaust noise in comparison to the larger more engineered oval car mufflers but trucks were for work and power.

About 1950 truck mufflers were given slightly larger inlet and outlet pipes. This allowed increased air flow which related to the slightly larger carburetor installed that year.

During the late 1960′s the Chevrolet truck Master Parts Catalog no longer listed mufflers. It appears they discontinued these units and left them to be provided by auto parts stores. By about 1995 the larger 1950′s straight through muffler was the one style available and any remaining older pipes were modified to fit 2″ inlet and 1 7/8″ outlets. Length is about 20 ½ inches.

The cars were lower to the ground and thus, required an oval muffler.  This oval shape allowed it to be higher and less likely to hit an object on the road.  Trucks were high and a round muffler was satisfactory.

Correct copies of these mufflers are available from Jim Carter’s Classic Truck Parts and a few other full stocking GM truck dealers.

 

Okie Bushing Installation (Just Before Installing)

Thursday, February 11th, 2010

okie bushing

The Problem

The closed drive shaft ( on GM 1/2 ton, 1937-54) is supported at the front by two bushings. As these wear egg shaped over many miles, the drive shaft begins to move up and down. This ruins the grease seal and causes the u-joint to begin rubbing the “bell”. Thus noise and vibration!

Finally, with a bad seal, the differential fills with transmission grease running down the drive shaft starving the shifting gears. Then, the rear wheel seals leak, the brake shoes become oil soaked, and finally the u-joint flies apart from rubbing the bell.

The Solution

Catch the developing problem early and save much expense and down time. Install what is sometimes called an “Okie Bushing”, an aftermarket, non-GM repair. This is a quick, permanent fix that does not require tearing down the differential!

Instructions

Remove the u-joint bell retainer and slide this bell back, exposing the u-joint assembly. Disassemble the u-joint by removing the four bolts. The rear u-joint yolk can now be slid off the 17 drive shaft splines, exposing the grease seal in the drive shaft.

Pull out this seal and the front egg shaped bushing from the torque tube. Sometimes this bushing is difficult to remove and special pullers can be rented. Otherwise, call Jim Carter’s Truck Parts at (800) 842-1913.  They have these pullers made.

Press in the long Okie bushing – seal first. Placing a wood block over the bushing end and tap into the drive shaft housing (torque tube) with a hammer.  This action will then press the other original rear bushing back out of position. The new Okie bushing will now hold the drive shaft in perfect alignment, as when the vehicle was new.

They used to advertise this as a permanent half-hour fix.  This is optimistic but so much easier than disassembling the differential as the Chevrolet dealers did 50 years ago.

 

Original Engines Must Breathe

Thursday, February 11th, 2010

Before the modern Positive Crankcase Ventilating System (PCV) most automotive engines breathed externally and removed their excess products of combustion into the atmosphere. It was a standard of the industry!

The lower end of the engine (below the pistons) had an attached draft tube that extended outside and below the block. It released blow-by from worn piston rings and other pollutants created from the crankshaft turning in hot motor oil.

The upper end of the overhead valve engine also must breathe. On early Chevrolet and GMC inline six cylinder engines, the venting is usually in the valve cover through factory slots. When an add-oil cap exists on this cover, it seals tight. It does no breathing.

On 1955-62 Chevrolet 235 six cylinders the valve cover slots were illuminated. It is assumed badly worn engines at high RPM leaked oil at these slots. The venting requirement was now moved to the oil cap. These redesigned caps have two features. They cover the add oil hole and vent the upper end of the engine. Their disadvantage is their internal filter can clog with oil vapors and dirt from a badly worn engine. This type venting cap must be kept clean!

The following photos show venting methods on early Chevrolet and GMC engines. Note the oil and breathing cap on the later six cylinder Chevrolet engines.

original engine 1

1937 through 1953 216 sealed oil cap (above)

original engine 2

216 valve cover vent slot (above)

original engine 3

1954 Chevrlot Vents (above)

original engine 4

1955-1962 non vented cover (above)

original engine 5

1955-1962 vented oil cap (above)

original engine 6

1963-1972… 230 and 250 with PVC system (above)

Sloppy Floor Shift Lever

Thursday, February 11th, 2010

sloppy floor shift lever

Problem: Slop in the shift pattern on 1937-47 Chevrolet 3 speed transmissions.

When shifting into 2nd gear finds your knuckles contacting the glove box door, repairs are needed

Repairs:

Chevrolet did not plan on these 3 speed transmissions to be in use over 50 years so repairs in this area were not often discussed by GM. You can fix it anyway!

Remove the flat plate with the shift lever from transmission by taking out the 4 retaining bolts. (Be sure to replace this plate with cloth or cardboard so no foreign object falls inside.) Take the shift tower from the flat plate top by removing four retaining bolts. The shift lever and its 2 1/4 inch tension spring can now be taken from the tower.

Inside the top of the tower is the worn brass bushing causing most of the shift lever slop. A replacement with tension spring can be obtained from Jim Carter’s Truck Parts and most of their full stocking dealers.

1937-1947 3 Speed Shift Repair

Shift Pin

Sorry, exchanging the brass bushing will not solve all the problem. The long horizontal pin, through the shift lever ball, needs to be replaced. The pin will probably be worn on each end and needs replacement.

Using a drill bit is a good option for a new pin. If a 1/4 inch drill bit easily moves into the shift lever ball, move up to the next size. (Maybe as much as 9/32 inch drill bit). Use it to drill the hole oversize, then use this same drill bit as the new pin. After drilling, remove the drill portion on the bit, and you have a nice hardened pin! Note: do not cut the drill bit until you know the exact length needed. Get a correct size by turning the shift tower upside down and measuring the distance between the two notches to the tower walls.

Artillery Wheels

Thursday, February 11th, 2010

The term artillery wheel is a nickname adapted from a scalloped type wheel often seen on US military vehicles in World War I. The similar appearance at a distance to GM’s scalloped steel wheels quickly gave them the name artillery.

On GM trucks, this style was first used during 1934-36 as a stock six bolt 1/2 ton 17 inch wheel. It was much stronger than the existing wire style wheels due to it being less susceptible to bending when hitting a large pot hole or sliding against a curb.

Though this 17 inch unit was discontinued on 1/2 tons for 1937, a redesigned 15 inch artillery began as GM’s stock wheel on that year’s 3/4 ton truck. It was stronger and wider but was still a non-split rim design. This remained the GM 3/4 ton wheel through 1945. By 1946, six bolt wheels on trucks were limited to 1/2 tons. The 3/4 ton would now have 15 inch 8 bolt split rims which remained stock into the 1960′s.

Today, we sometimes see 1947-59 GM 1/2 tons equipped with these early 15 inch artillery 3/4 ton wheels even though they were not placed on factory trucks after 1945. To many, they provide a unique appearance on the later 1/2 tons and will still hold the trucks current hub cap.

atrillery wheel 1

Regular 16″ Wheel (above)

artillery wheel 2

1934-1936 17″ Artillery Wheel (above)

artillery wheel 3

1937-1945 15″ Artillery Wheel (above)

Timing Gear

Thursday, February 11th, 2010

About 10 years after the introduction of GMC’s new inline six cylinder engine in 1939, General Motors issued a ‘Product Service Bulletin’ in regards to a recommended improvement on the 228, 248, and 270. It appears the manufacturer discovered a weakness that shortened the life of the engine timing gears. This recommendation was made for enlarging the oil supply hole leading to the meeting point of the two gears. The attached dealer bulletin was issued January 31, 1949.

This is especially interesting considering over a million GMC trucks with these engines had been built prior to this. The number includes the five years of military large trucks that were used during WWII under very abusive off road conditions!

tming gear

After Market Wheels for Older GM Trucks

Thursday, February 11th, 2010

From 1934 to 1959 GM 1/2 tons came from the factory with a tie rod assembly that extended side to side to almost touch the front wheels. With everything stock, the tie rod sits about 3/4 inch from the inside of both original six hole wheels and all fits just right.

A problem exists when someone attempts to add a more modern wheel. For example, the mid 60′s and newer 4×4 wheels have this 6 hole bolt pattern but their width causes them to contact the end of original long tie rod. Changing from the approximate 4-1/2 inch original to at least a 6 inch width just won’t work.

Solutions for adding a more sporty wheel are very limited with the original suspension. One almost unknown method is to replace the original GM multi-piece tie rod ends with the more modern knuckle ends introduced in the 1960′s. There are currently available and are 3/8 inch shorter on the outer end giving that much extra room for a slightly wider wheel. (It is not recommended that flat washers be placed over the stud between the wheel and drum as this can cause breakage.)

This GM six bolt pattern is also shared with several Japanese pickups. Some very attractive more narrow aftermarket wheels have been produced for their imports in past years.

Water Pump Modification

Thursday, February 11th, 2010

If you use a recently manufactured 216 water pump and combine it with the optional larger OEM radiator fan, a slight modification is necessary. The fan rivets will not clear the edge of the pulley hub. You must cut four notches in the hub for rivet clearance. Water pumps in the last five years appear to lack these notches.

Note: These larger fans, 18″ long, were optional on smaller trucks and always came on the 1 1/2 ton’s. It is the 15″ fan that will usually be on small trucks and passenger cars.

Comments courtesy of:
Bob Adler, Stephentown, NY.
bobadler@nycap.rr.com

water pump modification

Notice the four notches cut on the outer rim of the hub. (above)

water pump modification

Hub and Fan. (above)

Venting the Differential

Thursday, February 11th, 2010

Sometimes overlooked by mechanics and restorers is a small vent in the rear axle housing. This part is necessary to keep internal pressure equal to the outside atmosphere. Thus, as the internal temperature of the differential warms during use, any expanding heated air is vented and no pressure occurs. This saves wheel and pinion seals from leaking.

Check for this vent in your truck. From years of abuse many vent assemblies are missing. A sliding log chain wrapped around the axle housing for pulling is a way many vent assemblies were accidentally removed. The owner usually didn’t know the damage has been done or that a vent ever existed. Now, the small hole that once held the vent assembly is able to take in water. This is certainly not good for the internal differential parts.

Differential Vent 1

Differential Vent 2

1946-1972 Ring and Pinion

Thursday, February 11th, 2010

One series of the famous “drop out” GM differentials was used between 1946 and 1972 on 3/4 and 1 tons. The complete assembly (often called a pumpkin) will interchange during these years with no alteration.

The highest gearing in this series is the 4.10 ratio and is found in most 1967-72 3/4 tons with automatic transmissions. Therefore, those “low gear blues” often associated with 3/4 and 1 tons during the late 1940′s and 1950′s can be greatly improved with no visible exterior changes. Originally these older trucks had a ratio of 4.57 in the 3/4 tons and 5.14 in the 1 tons.

Once a 4.10 pumpkin is located (usually in a local wrecking yard) it is a basic interchange requiring little more than new gaskets and gear grease. Your truck’s personality is now changed!

For those wanting a new 4.10 ring and pinion, production was begun again in April 2000 (at this time they also produced a 3.90 ratio). In order to use these assemblies in the 1940′s and 1950′s truck, they must be attached to the differential carrier from a 1964-72 3/4 ton. Only then can the complete pumpkin be installed in the older truck.

The only negative to this changeover is if you are hauling a ton of gravel up a mountain road with the original smaller six cylinder!! In this example a lower geared differential is best.

1939-1946 Replacement Seat Cushions

Thursday, February 11th, 2010

Locating a pair of seat cushions for the 1939-46 truck has become very difficult in recent years. These early trucks increased popularity is the main reason for the shortage. Even when a pair of cushions are located the asking price often does not justify the purchase because of the age damage to the springs and frame of the lower cushion.

It is this lower cushion that has received the most wear in its 60 years. In a salvage yard the door or window left open for even a year allows rain water to soak the seat padding and hasten the damage.

As your hunt continues, here is a practical substitute that fits the cab well and gives the appearance of a re-upholstered original. Locate the common rear seat (not the middle) in a 1984-90 Dodge Caravan or Plymouth Voyager mini-van. You can even pull the factory levers on the back and the seat is quickly removed. Most salvage yards have many extras and their pricing should be under $50.00. You will even get the seat belts!

With less use of this rear seat in the van, you can find one with no tears or permanent stains.

The next step is cleaning. Simply place it in the bed of your late model pickup and find a coin operated wand car wash. The hot soapy water will make the cloth covered cushion like new for less than $5.00. Leave it in your truck for a few hours until the water drip stops. Then place the cushion where it can dry. In about 24 hours, the job is done! The padding is closed cell foam and does not absorb water.

You won’t need most of the lower metal attaching brackets. Remove them and attach the remaining metal and cushions to your trucks original seat riser. Here is where you can be creative but it is done and the remaining metal will not be visible.

For the perfectionist, the cab tapers inward as it reaches the cowl. Thus, the two doors are slightly closer to each other at the front in a standard cab. This new van cushion will touch the front of the doors because of this taper. If you don’t like this contact with the door, an upholstery shop can place a taper in the lower cushion to parallel the inside door panel. A small portion of the foam edge can be removed from the front sides of the lower cushion.

Continue to search for the original 1939-46 seat cushions. In the meantime, you have very comfortable clean cushions with seat belts. Most people will think you had your originals reupholstered.

The following article and pictures were received from Brett Courcier. He personally used this type seat and is very satisfied.

My name is Brett Courcier. I live in Fremont Nebraska. I own a 1946 Chevy pickup street rod. I wanted to take a few pictures of how my seat fit in my truck. I was trying to find a seat for my truck. I found a Plymouth Caravan minivan rear seat. It fit great. I cut off the latching pieces that go in the minivan floor and welded on a piece of 2″ square tubing to the front legs and a piece of 1″ square tubing to the rear legs. The pictures show them. My upholsterer added lumbar support to the lower back area and also added 2″ in heigth to the back of the seat. The seat comes with three seat belts and folds forward from the back of the cab. We added a full length pouch across the back of the cab for storage. I hope the pictures show enough for you. If you have any questions please contact me.

Brett Courcier

402-727-7127 or e-mail baccourcier@team-national.com

seat 1 seat 2 seat 3

Early Park Light Assemblies

Thursday, February 11th, 2010

The introduction of factory sealed beam headlights came to the automotive industry in 1940. It was then necessary to create park light assemblies. (They could no longer be incorporated in the bulb and reflector style headlight as before).

To some, the first 1940 GM assemblies were simply “add-ons”, maybe a quick design due to the fast industry acceptance of the new sealed beam system. They sat on the front fender away from the headlights and were the same on Chevrolet and GMC trucks as well as Chevrolet cars. Right and left are identical.

By 1941 GM engineers had developed park light assemblies to flow more with the body lines. Most every GM vehicle had a newly designed unit. The exception was the Chevrolet and GMC trucks. Whether to save money or there was not time, GM’s 1941 commercial vehicles were given the same park light assembly as used on the Pontiac car the year before. These 1940 Pontiac assemblies secured very nicely to the top of the long truck headlight bucket in 1941 and provided the more modern look.

By 1942 GM trucks were finally given their own park light assemblies. They were similar to the 1940 Pontiac design but were more basic. What had required four die cast pieces with the early Pontiac style now could be accomplished with one stamped sheet metal cover. This of course, required a subtle change in their glass lenses. This 1942 design was continued through 1946.

Early Park Light Assemblies

Early GMC Tail Light

Thursday, February 11th, 2010

During the early years, GMC and Chevrolet pickup trucks shared many items to keep manufacturing costs manageable. Fenders, wheels, transmissions, cabs were the same. Engines, grills, hub caps, and tailgates were unique to each brand.

For some reason taillights were also made different. Extra expense was spent to keep this area individual for each made. GMC pickups from their beginning in 1936 through 1946 used a five inch diameter light that was nothing like their Chevrolet cousin. It even attaches to a different bracket and does not interchange with Chevrolet.

It was not until the new body style in mid 1947 that the two brands shared tail lights. When the larger GMC’s 4 1/2 inch light was discontinued on trucks in 1947, Chevrolet introduced it on their 1949 through 1952 station wagons. It was placed in the center of the gate and was the only factory light.

Even though this light was used for so many years, it is becoming very difficult to find. Most GMC pickup restorers use the reproduced Chevrolet rectangular design and only a few GMC perfectionists are aware that there is a difference.

The photo below shows the real GMC tail light of the early years 1936-46.

Early GMC Tail Light

Seat Cover Kits

Thursday, February 11th, 2010

Our seat cover kits are produced with an emphasis on originality. The materials are top quality for many year’s service. Seams, ribbing, etc., are based on original seats.

seat cover

We recommend that installation be done by a professional upholstery company. However, if you wish to do it yourself, here are several important steps to follow:

1. Seat springs must be in original condition. No breaks, sags, etc.

2. Over springs, place one layer of burlap.

3. Over burlap, place two layers of cotton padding. Cotton must extend down over edges of outer springs.

4. Place vinyl cover over padding. Stretch evenly to eliminate wrinkles. Press special C shape clips at rear of springs to permanently hold cover in place.

5. If clips are put in place with pliers, cover the end with tape or equivalent to lessen chances to vinyl tears.

6. Wrinkles from storage will normally disappear in several days.

6 Volt Bulbs

Thursday, February 11th, 2010

Two major changes occurred in 6 volt General Motors sealed beam bulbs since they were first installed on vehicle assembly lines in 1940. The perfectionist restoring his truck to exact original specifications must have the correct sealed beams for his year. In very competitive judging, it’s these details that can make a difference. No doubt, replacement bulbs from a GM dealership with slow sales could sometimes be placed on newer vehicles a few years after the units were discontinued, however this article is based on bulbs you would have bought new from the factory during that particular year.

1940 through about 1946 – These sealed beams had a double filament small bulb built inside. The large glass reflector in the back was sealed from the elements.  It stayed bright until the bulb burned out.  It was not like earlier open reflectors that could tarnish with age.  The assembly comes with a metal black back attached. If the outer glass gets a rock hole, the light continues to work well. The filament is still encased in the smaller argon gas filled glass bulb (see photo).

6 volt bulb

1940 through about 1946 (above)

About 1946 through 1955 (below)

The first sealed beam bulb, as we know it, was introduced after the end of World War II. Between the reflector and the outer glass covering is the open unprotected filament (no small internal bulb). The total interior is filled with argon gas to protect the filament from air which causes instant burn out. When a rock places a small hole in the glass the filament is ruined.

The big visible difference in this first real sealed beam bulb and today is there was no aiming bumps on the outside as in later years. The dealer aiming equipment had not been invented.

1955 and Newer 6 volt bulb

1955 and Newer 6 volt bulb

1955 and newer…(above)

Beginning in 1955 the 6 and 12 volt sealed beams have three glass aiming bumps molded in the edges of the lens. The bumps were needed by new light aiming equipment provided to GM dealerships. All of these GM bulbs with aiming bumps have the letters T-3 molded in the center of the glass lens. Most will also have the word Guide at the top of the lens.

Note: These modern bumps will interfere with properly attaching the chrome bezels on a 1940 headlight bucket as well as a 1937-1939 bulb light that has been converted to sealed beams. The bezels were not designed for the bulb still 15 years in the future. The 1940 GM vehicle owners will have a long hunt to find sealed beam bulbs without the three bumps.

4 Speed Back Up Light Switch

Thursday, February 11th, 2010

Four Speed Backup Light Switch – They Did Exist!

4 Speed Back Up Light Switch

The first design of the 4-speed synchronized truck transmission, introduced in 1948, was used through about 1965. About mid series, when the dealer installed backup light increased in popularity, a special switch was attached to the base of the floor shift lever. This was the only location possible as there is no external linkage on a 4-speed.

No doubt regular floor contact with shoes and boots shortened the life of this small electrical switch.

Buy Parts for 1934 to 1946 Trucks

Early Gas Tank Danger

Thursday, February 11th, 2010

On most all early GM trucks their fuel line exited on the bottom of the tank. It was usually attached to a brass shut-off valve which threaded into the tank. In case of fuel pump or line repair, a person had to lay under the truck to turn the tank valve and stop fuel flow.

No doubt, this design resulted in many building fires as the trucks aged. By design, the tank is above the fuel pump. Thus, an un-noticed fuel drip or worse will continue until the tank is drained by gravity. What a dangerous mix in the many homes at that time with basement garages and nearby gas fired water heaters.

In 1954 the needed change occurred. The gas pick-up line now leaves the tank on the top but extends down to almost the bottom. In this way, the gasoline does not drain due to a line leak and sediment stays in the tank bottom.

For the perfectionist wanting his truck authentic, the original system does not have to be a fire hazard. Regularly check the short neoprene flex line between the tank and fuel pump. There is a limit on how long the non-metal flex fuel line can last.

early gas tank danger 1

1954 and newer (above)

early gas tank danger 2

1953 and older (above)

1937 – 1972 In Cab Gas Tank – Friend or Foe

Thursday, February 11th, 2010

What’s this bad rap some people give the GM pickups with in-cab gas tanks? For 35 years GM protected these tanks from collisions by double wall reinforced cab metal, doors, and seat frames. The 1937-46 pickups even secured the tank under the seat and surrounded it on three sides by the welded to floor heavy metal seat riser.

If you and your truck are ever involved in a collision so major that the gas tank begins leaking, then imagine what could be occurring if the tank was in most other places on the truck. Unless you have found a narrow tank that fits inside the frame rail and away from the drive shaft, you haven’t located a safer location than what GM used between 1937 and 1972.

For approximately 18 months, beginning with the 1947, Advance Design body style, GM placed their pickup gas tanks under the bed inside the frame rail. This location, while protected from side impacts, was very susceptible to damage from road debris. Leaks from being hit by rocks and stumps soon caused GM to again place the tanks in the cab. Possibly, a protective panel would have given the tank a shield but GM did not use this option. The tank went back in the cab.

In these older trucks you instantly smelled gasoline if the sending unit gasket or gas filler hose began to fail. Trucks with under the bed tanks usually must be parked and dripping before a person smells the vapors.

If you critique the early in-cab GM gas tanks, don’t forget what the manufacturer did to the truck series beginning in 1973. Can you believe? They secured the tank in their pickups to the outside of the frame rail under the bed. The only separation from a broadside accident is the single layered sheet metal bedside! It doesn’t take much of a side impact to flatten the tank with disastrous results.

Currently, the nervous owners of some earlier pickups move the tank out of the cab and place it under the bed behind the rear axle. This new tank position is definitely exposed to major damage from a heavy hit at the rear. An original in-cab tank is nicely protected from most of these rear and side impacts.

Don’t make your truck more dangerous than it was originally!!

in cab gas tank 1

An in cab underseat gas tank as used between 1937 -1946…It lays inside a metal seat riser as well as being inside a heavy guage metal cab. (above)

in cab gas tank 2

The above photo wa taken of a 1952 Chevrolet 1/2 ton daily driven pickup. The owner was so concerned about the gas tank in the cab that he placed it under the bed behind the rear axle. The non metal tank is just waiting for a rear end hit at about 20 miles per hour. The original bumper will offer little protection and the contents of the tank will spread in all directions…Is this a moving bomb ready to explode?

Frame Horns

Thursday, February 11th, 2010

During 1941-46 a unique device was used in the front of both frame rails of Chevrolet/GMC trucks. It was designed to serve two purposes. This cast iron ‘horn’ was a spring hanger as well as a connection for front bumper braces.

These horns are securely riveted into the end of the frame and were designed to last for the life of the truck. Only more serious front-end wrecks will damage them. Usually the whole frame can bend before the cast iron horn breaks. Most were damaged due to lack of lubrication of the shackle pin and bushing. Finally, the pins wear through the bushing and then work on the casting. Finding usable frame horns in recent years have been very difficult. None are being reproduced.

Frame Horn 1

Left side with Frame Horn

Frame Horn 2

Right side with Frame Horn removed

Photos are by Judy and Dave Gaudet email: cohortva@shaw.ca

Early Ignition Wire Protection

Thursday, February 11th, 2010

During the 1930s and 1940s many auto and truck manufacturers protected the long ignition wire between the dash switch to the coil beside the engine. The technology of wire insulation wrap during these early years was a woven cotton covering and it was more susceptible to damage from oil and antifreeze in the engine compartment. For protection, a metal wrap was placed around this electrical wire. See attached photos from a 1941-46 GM truck. A metal cap even covers the connection on the top of the coil for protection. It unsnaps to disconnect the ignition wire from the coil.

The cable system was very good 60 years ago, however, today it can create much frustration. The cotton insulation on the inside wire has deteriorated and pieces can drop away. In time the hidden wire gets exposed and may touch the outer metal cable causing a dead short. The engine stops with no notice. It may occur only on a rough road or during a fast turn. The engine may run well at idle or not run at all. One can imagine how difficult locating the problem can be. Opening the two ends of the cable and replacing the original wire may be good insurance. A modern vinyl covered wire will never be seen inside the original metal wrap.

Early Ignition Wire Protection 1

Early Ignition Wire Protection

1941-1946 Horn Parts

Thursday, February 11th, 2010

One of the more asked questions on the 1941-46 GM trucks is regarding horn contact parts. Most have been damaged over the years and new owners are unsure how they were originally assembled.

Below, is a diagram from a 1940′s GM Master Parts Catalog and gives an excellent view of the parts used in the assembly.

Most items are currently reproduced, including the upper bearing, rubber bumper, cap assembly, steering wheel, mast jacket, 3 finger horn cap retainer, and internal cap spring.

Note: Added are the available part numbers from the Jim Carter Parts Catalog.

Horn Contact Parts

Speed Up 6 Volt Starting

Thursday, February 11th, 2010

One of the more common reasons for slow engine turnover using an original six volt system is under size battery cables. Most of today’s auto parts stores only stock the smaller diameter 12 volt design. Unknowing owners mistakenly replace their original worn cables with shinny new ones that are as much as half the diameter as needed. Two ground cables are also required: One from the battery to the frame and one from a starter mounting bolt to the frame.

Six volt starters require twice the electrical flow to operate properly. Don’t blame your six volt system for slow unacceptable starter motor speed! Many restorers go to the expense of changing their 6 volt system to 12 volts. They feel their original system was inferior and believe what they did was necessary. The problem could have been corrected with just adding the three proper cables.

Remember: Millions of cars and trucks were made with 6 volt electrical systems each year. If they had not operated correctly they would have been built with 12 volt systems!

Battery Cables 6 Volt

Buy Parts for 1934 to 1946 Trucks

Unique GMC Hood Ornaments

Thursday, February 11th, 2010

The big news for GMC in 1936 was the introduction of their first 1/2 ton pickup. Though GMC now shared cabs with Chevrolet trucks, the visual exterior differences were mostly noticeable in front of the hood.

The GMC grill was totally redesigned and did not resemble the Chevrolet truck. This unique grill was modified little between 1936 through 1938 but the top grill ornament was changed with each of these years.

Watch for these ornaments at swap meets, antique shops, and older vehicle trade shows. They are extremely rare! Even locating the real thing for the following photos was very difficult.

1936

hood ornaments 1

The first year for the newly designed GMC 1/2 ton (cab shared with Chevrolet trucks) and the last year for the exterior radiator cap. This example of flowing artwork rivals even nicer automobiles of that year.

1937

hood ornaments 2

hood ornaments 4

The hood must be raised to reach the hidden radiator cap but a fixed die cast logo (similar to 1936) remains the focal point at the top of the grill.

1938-1946

GMC extends the smooth front hood hold down upward several inches and eliminates the die cast letters. This chrome extension (not like Chevrolet) can be just as rare as the early style. Once off the truck at a salvage yard, it soon becomes mixed with scrap iron because of no identifying GMC letters.

hood ornaments 3

WWII Door Handles

Thursday, February 11th, 2010

Shortages during this major war was the reason for many modifications of Chevrolet and GMC door handles. War demands for die cast material changed handle designs on military trucks as well as the few commercial vehicles bought by civilians.

The attached photos show these war time designs. The exterior handles have a stamped steel outer cover. Their inner liner is thinner metal and much more susceptible to rust. The entire assembly at times holds moisture resulting in damage during below freezing temperatures.

Both the inside doors and window handles were made with flat steel. This was covered with a Bakelite or plastic type material in a mold. It prevented rust and gave the shape of the earlier die cast handles. Unfortunately, years of heat and cold caused shrinkage and cracks. Pieces broke away and finally the internal metal strip is all that remains of the original handle.

The door handles usually had a short life but did serve the purpose during a time when better material was not available. Most were exchanged, with the chrome die cast style, after the war.

WWII Door Handle 1

Exterior handles; Side view with one ferrule still attached.

WWII Door Handles 2

GMC Exterior handles; Side view of metal stamping.

WWII Door Handles 3

Interior handles; The full set. Middle windshield handle not used by military.

WWII Door Handles 4

Interior handles; Close up of a pair for a door.

1939-1946 Suburban and Panel Doors

Thursday, February 11th, 2010

The unusual side doors on these Suburban and Panel trucks will fit on the more common pickup cab, however, their looks will tell the observer that something is not correct. Across the top of the outer skin is a horizontal stamping or groove. This groove is a continuation of the stamping that runs the length of the body to help strengthening the long sheet metal sides.

The pictures below should help you is obtaining the correct used door for your panel or Suburban restoration project.

Suburban and Panel Door 1

Suburban and Panel Door 2

Hub Caps-Used 15 Years

Thursday, February 11th, 2010

Many of the tech articles on this web site emphasis’s the subtle ways that truck parts were made economically by GM. Truck often received Chevrolet car items that were used the year before. Sometimes even other GM brands sent their older items to be placed on assembly line trucks.

Of all the ways GM saved money on truck parts, none is more unique than the savings on 1/2 ton hub caps. Chevrolet pickups used the same baby moon style hub cap from 1940 through 1955. The skins and basis are the same. A relative inexpensive addition was simply changing the lettering or emblems on the outer brass skin. They required a change in tooling, not expensive for a company the size of the Chevrolet Motor Division. The stamping department just kept making the same base and skins. The skin surface stamping changed as was required by the design department each year.

Check the following pictures. The base hub caps are all the same. Some of the car hub caps are the same as the trucks. Even GMC trucks decided to use these caps between 1947-55. After all, just placing the three GMC letters on the skin added much savings to the company’s bottom line.

hub caps 1

1940 Chevrolet 1/2, 3/4 ton and car (above)

hub cap 2

1941-1946 1/2 ton, 1941- 1945 3/4 ton, and 1942 -1948 car (above)

hub cap 3

1947-1951 GMC, Chrome (above)

hub cap 4

1947-1951 Chevrolet, Chrome (above)

hub cap 5

1954-1955 1st Chevrolet (above)

hub cap 6

1952-1953 Chevrolet Painted (above)

1936-1946 Door Handle Mystery

Thursday, February 11th, 2010

Two different designs of inside door handles are seen when looking at 1939-46 Chevrolet and GMC trucks. This photo shows the attaching portion is the same. However, the opposite ends are much different.

Door Handle Mystery 1

Question: What are the years each design was used? We ask for your opinions. Our ideas are as follows:

1939-41 ‘ Small ends on handles

1942-46 ‘ Large ends on handles. This allows the palm of a hand to better push the handle and open the door. (A later aftermarket company also sold the 1942-46 style. Only GM produced the 1939-41 design.)

Early GMC Hood Side Trim

Thursday, February 11th, 2010

GMC entered the light truck market in 1936. They shared some sheet metal with Chevrolet including the two tops of the four piece butterfly hood. However, the hood sides were not the same and certainly their trim was totally different.

Two designs of the General Motors Truck logos were used during the years of the side opening hoods. The 1936-37 hood sides held a narrow horizontal logo plate above the air vent openings as in attached photo. The right and left were the same. A more streamline design began in 1938 and was carried through 1946. Its rounded point on only the front creates a different part on the right or left.

early gmc hood side trim 1

1936 – 1937 GMC Hood Side Trim (above)

early gmc hood 2

1938 – 1946 GMC Hood Side Trim (above)

1934-1946 Door Hidden Bumper Cushions

Thursday, February 11th, 2010

The mystery of where to find and replace the rubber door bumper cushions on 1934-46 GM trucks is solved by the following data:

During many restorations these bumpers are neglected or the owner doesn’t even know where these small units are hidden. They can not be seen unless the inner cab sheet metal panel at the rear door post is removed.

The purpose of these rubber bumpers are to cushion the door dove tail that has entered the receiver on the body post. (The dove tail is attached to the door and supports it when in the closed position.)

These bumpers are paired with small protective cups. The bumper gives the cushion to the door and the metal cups take the wear as the dove tail enters the cab post.

The old saying ‘a picture is worth a thousand words’ certainly applies here. The left cab rear door post in our example was removed from a very tired truck, however the dove tail mechanism was still good. Even the original Export Blue is still showing. The parts were carefully removed and some even cleaned of rust for better pictures.

Check the following data and pictures. They should help one even better understand GM’s heavy duty door support system.

Door Bumper Cushions 1

Removable components of the door cushion system. The Metal cups will cover the smaller part of the rubber cushion.

Door Bumper Cushion 2

The assembly as it sets in the cab post.

Door Bumper Cushion 3

The inside of the cab post. Much of the assembly fits inside the small box which is welded in place. Note how the ears on the cups connect to the larger bracket. This is not visible in an assembled truck.

Door Bumper Cushion 4

What you see on this cab post. These screws have been loosened prior to removal. Only the back side of the metal cups are visible.

Door Bumper Cushions 5

The back side of the cab post. The inner sheet metal has been removed exposing the retaining screws. Seevral very small screw holes ( about 5″ apart) are visible where the sheet metal panel is secured.

Counterfeit Hub Caps

Thursday, February 11th, 2010

Companies outside the Chevrolet Motor Division have always produced replacement parts for the aftermarket industry. Manufacturers begin reproducing non-original parts very soon after a new vehicle is introduced.

A problem occurs on decorative trim such as hub caps. Here, Chevrolet (and other manufacturers), display their logo to attract positive attention. To reproduce a Chevrolet hub cap, non-GM companies have at times altered the bow tie logo. In this way, they have avoided legal action by GM and market a hub cap that was close to the original. Their hope is that most people would not notice the small changes. These caps were usually produced in the 1930′s ‘ 40′s and marketed through auto parts stores or by mail order.

In today’s world, these caps have become very rare as few collectors use them on their vehicles. GM has now given approval for reproducing these obsolete correct logo caps and most collectors want the real thing. The few remaining ‘counterfeit’ caps have a place on your garage wall with their unique history.

counterfeit hub caps 1

counterfeit hub caps 2

counterfeit hub caps 3

Buy Parts for 1934 to 1946 Trucks

1934-1946 Door Handles

Thursday, February 11th, 2010

The two series of exterior door handles on GM trucks between 1934-46 are certainly different yet they share a few similar features of interest.

One characteristic which seems strange today is that the handles lock the right doors only, not on the left. This occurs on GM trucks from the early 1920′s to about 1959. At this time, we have no reason for this feature. Maybe it kept the driver from standing too near traffic as he locked the door!

The 1934-38 handles are the same. The left has no cylinder key but the right handles are the locking style. Yes, the right and left handle will interchange but this is not the way it was done by GM. Switching handles would prevent the right door from being locked. There is no inside lock on the right!

With the introduction of the new body style in 1939, the handle design also changed, however the locking and non-locking handles remained in the same position. The big change started in 1942.

GM decided that rough roads plus freezing in the North caused too much lock breakage. The die cast lock parts inside the handle were too easy to break. During that year, the lock was moved down into the door skin. Both right and left handles became the same non locking design. The following photos show this big change in door locking on Chevrolet and GMC trucks.

Door Handle Trivia

The locking key cylinder used between 1934 to 1941 is the same despite visual changes in the handle body. Of course, if the truck is right hand drive, all is reversed!

1934-1938 Right

1934-19938 Right Door Handle

1939-1941 Right Door Handle

1939-1941 Right Door Handle

1939-1946 Left and 1942-1946 Right

1939-1946 Left and 1942-1946 Right Door Handle

1942-1946 Right

1942-1946 Right Door Handle (lock in door skin)

Buy Parts for 1934 to 1946 Trucks

1939-1940 Chevrolet GMC Grills

Thursday, February 11th, 2010

The 1939-1940 Chevrolet and GMC grills may look the same when they are seen separately, however they are not! By sharing fenders, hood top, headlight stands, etc. , the grills overall dimensions had to be the same. To keep each marquee individual, GM made the grills different. When the two are compared side by side, what a difference!

1939-1940 GMC Grill
1940 Chevrolet Grill
1939-1940 GMC Grill
1940 Chevrolet Grill

1936 vs 1937-1938 GMC Grilles

Thursday, February 11th, 2010

Though at quick glance, the GMC grilles of these two years may seem the same, however, look close. Changes at the top show slight differences. The die cast assembly at the top of the 1937 grille gives the impression that the vertical grille bars extend through the emblem. They don’t! It’s an illusion and is die cast. The hood ornament above repeats the GMC letters.

The 1938 doesn’t have the upper die cast vertical bars. They even eliminated the GMC letters on the hood ornament.

All these emblems are extremely rare. If they have the GMC letters they usually go in a hobbyist collection. If they don’t have the letters most don’t know what they are once separated from the truck and they go to the iron pile.

1936 grill 1

1936 Grille (above)

1937 grill2

1937-38 Grille Bars (above)

1938 grill 3

1938 Upper Grille Bar Housing (above)

 

Low Cost Front Suspension Upgrade

Thursday, February 11th, 2010

The straight axle ½ ton GM pickups (1959 and older) were built tough! They served their purpose as the best in work vehicles for over 30 years. Other than an occasional kingpin replacement, they were almost ‘bullet proof’.

In today’s world, the reasons for owning an older truck, has generally changed. Most have been retired from work responsibilities and have become ‘fun trucks’ driven with care on smooth streets. Hauling merchandise is far down the list of their use.

The resulting demand for a smoother ride and better braking is the reason for many suspension options available from supply houses. For those willing to compromise on originality for an easier ride, one of the most proven and less expensive upgrades is the front suspension of the AMC Pacer. The price is right and the results are excellent. This coil spring rack and pinion front suspension assembly gives passenger steering and ride qualities.

A specialized adapter plate (available from the catalog on this web site, HP127) allows for the connection to your ½ ton truck. Instructions explain parts to remove from the Pacer assembly before the plate is welded in place. The total assembly is then bolted to the truck front cross member. No cutting on your truck! You can even trim the Pacer coil springs to get a lowered level on the total vehicle.

The adapter plate is not expensive. The main project is locating a good Pacer front suspension. This AMC vehicle was produced between 1975 and about 1982. The later years even had disc brakes.

low cost 1

AMC Pacer (above)

low cost 2

1947-1953 Advance Design (above)

Lever Action Shock Absorbers

Thursday, February 11th, 2010

Trucks of the early years were often exposed to the rough terrain of local gravel roads as well as the dirt ruts on the farm. Quality, long life shock absorbers were a necessity. Therefore, trucks from the mid 1930′s through 1949 continued with a proven design carried over from earlier vehicles.

The highly successful lever action shocks had been used since the 1930′s on GM cars and trucks. They should not be confused with knee action shocks on the front of mid 1930′s Chevrolet passenger cars. This is a totally different system.

Lever action shocks are simple in design but excellent in quality and long life. Their cast iron fist sized housing, bolted to the frame rail, contains hydraulic fluid and basic internal parts. The fluid is forced through a small internal orifice as the vehicle encounters uneven road surfaces. The slowness of the moving liquid inside the shock gives a cushion action that softens the ride.

The workmanship built into these lever action shocks are an excellent example of quality GM engineering. On many trucks throughout the country these factory shocks are continuing to serve after 50 years and with the abuse of no past servicing.

The weak point is the small rubber bushings at each end of the link, not the actual shock assembly. During many restorations the hydraulic fluid is changed, link bushings replaced, and the shock continues to operate like new.

Single action shock absorbers were standard equipment of the 1/2 ton and 3/4 ton trucks with an optional double action type available for more heavy duty requirements. A single action design has resistance only on the upward direction of the wheel while a double action style slows wheel movement on rough roads in both directions.

Basically the horizontal arm extending from the shock housing is attached to a vertical link that extends upward from the axle. The movement of the tire then causes this link and shock arm to also move, thus forcing of hydraulic fluid between chambers inside the shock housing giving a cushioning to road bumps.

In 1950, the lever action units were discontinued and replaced on new trucks with a modern tube type sheet metal shock. (This design continues to be used on today’s vehicles.) It should be strongly emphasized, the lever action shock absorber was not discontinued because it was inferior, but rather because the new style cost much less to produce and install. It was simply a matter of economics. The fact that lever action shocks had the potential to last 50 years over the 3 to 4 years of the modern unit did not prevent the change over!

lever action shock

Early Rear Axle Bumper

Thursday, February 11th, 2010

Mechanical components on trucks were usually kept for many years by GM. Unless an improvement was needed, there was no need to change a proven design.

early axle 1

An excellent example of this is the rear ½ ton axle bumper. The design was used from 1929 through 1946 on Chevrolet and GMC ½ tons. A rubber bumper is held down on the rear axle housing by a metal cover with two ears. These ears are firmly secured by the two u-bolts that connect the leaf spring to the round axle housing. If the truck is overloaded or the shock absorbers are worn, the rubber bumper prevents metal to metal contact between the axle and frame rail.

Two of the attached photos show an original used retainer with bumper in place. The black bumper (now reproduced) is how the rubber part looks when new.

early axle 2

early axle 3

early axle 4

early axle 5

WWII Cab Changes

Thursday, February 11th, 2010

With the US entry into World War II, trucks were quickly modified to be successful for military use. Pre-existing cabs, frames, and mechanical components were altered to be more usable when in everyday work duties or in battle.  NOTE:  The Chevrolet cab remains almost the same as those on civilian trucks.

WWII Cab 1
This photo shows a large military truck that was built by the Chevrolet Division of General Motors about 1941.  The items of much interest are the changes made for use overseas and when the truck was in the field.

WWII Cab 2

The horn button is of a very heavy duty basic design, not like on most civilian trucks.  Only the civilian ‘cab-over-engine’ body carried this style horn button on non-military vehicles.

WWII Cab3

Note: This is a civilian Chevrolet cab with many modifications. The windshield frame is operated differently. Its hinges are on the outside for easy repair. There is no crank-out assembly that is known for their short life. The frame is opened manually much like the trucks before 1936. The crank handle hole is not even punched in the dash panel.

WWII Cab 4

Identification tags showing the vehicle number and gross weight plus the operation plate of four wheel drive are screwed to the glove box door.  This box door lock uses no key!  There was always a chance of a driver losing his key.

WWII Cab 5

The crank handle hole is not punched in the dash panel.  The windshield frame is secured in the closed position by a simple wedge handle.

WWII Cab 6

The cab rear window is well protected with an exterior steel grill. We suspect many private owners would have liked this extra on their domestic trucks.

WWII Cab 6

The inside door and window handles are not die-cast due to the war time shortage of zinc. They are made of a steel stamping covered with a dull Bakelite molded material. This usually shrinks and cracks within a few years.

WWII Cab 7

The removable hood side panels are of extra thickness to protect the engine from enemy rifle fire.  The Chevrolet lettering was removed after 1941 to stop extra advertising.

WWII Cab 8

The different front sheet metal is always associated with a military truck. None of this is a part of civilian models. The hood has no center hinge at the top. Thus, it does not open on the sides as civilian trucks. The hood is hinged on the cowl and lifts upward at the front. The military wanted a heavy hood with much less complications as the side opening design.

WWII Cab 9

The windshield and hood have exterior hinges for easy accessibility if damaged overseas.

WWII Accelerator Pedal

Thursday, February 11th, 2010

During the war years, the US was plagued with a shortage of rubber. The Japanese occupied most of the islands that grew rubber producing plants. The majority of the rubber the U.S. could obtain was sent to the war effort.

WWII Pedal 1

Thus, manufacturers across the country were required to eliminate rubber and find substitutes. General Motors also felt the pressures on these non-war products. One of the more notable changed items was the redesigning of accelerator pedals on their trucks. All the rubber that had provided a non slip surface was removed. As a substitute, the metal surface was given three sharp edge slots. In this way the drivers shoe sole would not slip on the pedal surface. An excellent new design. (when you have a lemon, make lemonade).

WWII Pedal 2

No Pedal Pads

Thursday, February 11th, 2010

Maybe the rubber was of lesser quality. Maybe the GM truck division was saving money. For some reason Chevrolet and GMC trucks were not designed for rubber brake and clutch pads.

No Pedal Pads 1

To keep the driver’s foot from slipping on them, these pedals are equipped with small “bumps” in the metal. This gives many years of use by the soles of the driver’s shoes.

No Pedal Pads 2

These bumps are molded in the pedals during production.

Leather Gas Grommets

Thursday, February 11th, 2010

The United States and its allies suffered from major rubber shortages during World War II as the Japanese had control of most Indonesian rubber tree plantations. To survive without this material, much of the world was forced to settle on a limited supply of synthetic rubber of lesser quality. This material filled some needs but lacked the strength and durability of real rubber. Synthetic tires got half the mileage and this material had limited resistance with contact to solvents such as gasoline.

Leather Gas Grommet 1

This created immediate problems with the gas tank grommets on GM trucks. (This rubber ring seals the hole around the large gasoline add-pipe extending from the tank through the right side cab corner.) A synthetic rubber grommet was not practical in this location because of occasional gasoline spills during fill-ups.

Leather Gas Grommet3  3

A solution to the problem was using a proven material that was readily available in the U.S. It was leather! On the assembly line a punched leather disc was pressed over the gas add pipe and held in place against the body with a metal attaching ring. Four screw holes were punched in the body and ring at the factory for the screws. This leather grommet was not equal to the original rubber unit, but did hold its shape against the elements.

Leather Gas Grommet 2

Therefore, you can always identify a GM truck cab from this era because of the four punched holes beside the gas hole. The rubber gas grommets used before the war and after about mid 1946 will not totally cover these four small holes. Unless they are filled, by a body shop, the cab must remain the World War II type with the leather grommet.

Early Panel Truck Bumper

Thursday, February 11th, 2010

In designing the panel truck, engineers realized that this vehicle must have a bumper for body protection. This bumper however, created a slight problem! It held the person loading freight further away from the vehicle cargo floor. He was required to lean further forward to reach merchandise.

To help solve this problem, GM modified the standard bumper to come closer to the middle of the body. The bumper was simply given a stamping at the manufacturer and the solution was achieved. Though it gave the worker only a few more inches, it helped increase his reach.

In today’s world, the indented panel truck rear bumper (1946 and older) has become difficult to find. Most panel trucks are restored with a bumper from a pickup truck. Few owners are even aware that this specially formed bumper existed.

early panel bumper 1

early panel bumper 2

early panel bumper 3

1936 Side Mount Spare Differences

Thursday, February 11th, 2010

The 1934-36 half ton Chevrolet truck body style always placed their 17′ spare in the right fender. Even the Chevrolet car normally used the right side when only one side mount was added.

In mid 1936, GMC entered the ½ ton market for the first time. This light truck shared most all sheet metal and chassis components with Chevrolet except for the engine, hub caps, grille and tailgate lettering.

One of the more visual differences between the 1936 Chevrolet and the new GMC 1/2 ton is the location of the side mount spare. The GMC is on the left, not the right as with Chevrolet. This was done with little expense as the mounting brackets will fit the right or left side.

Why did GMC place their spare on the opposite side? The answer 70 years later is not known. We only assume it kept the two marques more individual with no extra expense.

1936 side 1

1936 Chevrolet (above)

1936 side 2

1936 GMC

1936 side 3

1936 GMC

1936 side 4

Mounting Hardware

Early Dash Panels

Thursday, February 11th, 2010

Gauges in Chevrolet truck dash panels during the mid through late 1930′s are very similar and are spaced, from each other, almost the same. Even their smaller chrome gauge rings interchange. The 1934-35 gauges are in the middle of the dash and there is no glove box. The 1936-39 instruments are centered above the steering column with the glove box on the right side.

Early Dash 1

When restoring these rare gauges, waterless decals are now available to help make them look like new. They are available from Jim Carter’s Classic Truck Parts as well as a few other full stocking dealers.

Early Dash 2

1940-1946 Dash Trim

Thursday, February 11th, 2010

A unique feature on GM truck cabs became standard equipment between 1940 and 1946. Before and after this, truck cabs were very basic. As they were made for work, almost no extras were on them. The idea was to keep manufacturing cost very low. There was much competition with other makes trying to also keep their sale price as low as possible.

Dash Trim 1

Therefore, it was a surprise in 1940 when GM trucks introduced an unusual feature on their commercial vehicle cabs. This was hammered paint plus a three piece set of narrow decorative horizontal chrome dash trim. It served no particular purpose but added to the appearance of the metal dash. This original trim was chrome on steel, so most show rust after 50 years.

Dash Trim 2

Re-plating of the trim is difficult. It can not handle much polishing before rust pits will leave holes in the trim surface. It is now being reproduced in mirror finished stainless steel. It looks the same but is resistant to rust. Contact Jim Carter Classic Truck Parts or other full stocking truck dealers.

1939-1946 Deluxe Cab

Thursday, February 11th, 2010

Deluxe Cab 1

Deluxe cab?  There is none!  Truck cabs during these early years all came the same from the factory. Accessories were dealer installed. You picked the factory installed color and transmission.  The dealership added the requested extras such as heater, inside sun visorright mirror arm, etc.

This changed on the Advance Design Cabs during 1947-55. The pickup had a deluxe cab because it was given factory rear corner windows, a right side sun visor, and door and windshield stainless trim.

1936-1946 Seat Adjuster

Thursday, February 11th, 2010

Some beginners tend to place 1936-46 cabs in the same category. Don’t do this! The 1936-38 and 1939-46 are a totally different design. Very little interchanges. The early style provided excellent building blocks for the new design 1939-46 trucks.

One major difference (when viewing a base cab) is the placement of the bottom seat cushion adjusters. On the early design a three prong bracket for a seat adjustment is attached in two places to the back of the cab. See Photo.

Seat Adjuster 1

The new 1939-46 design gives a totally different way the lower cushion adjusts. It sits on four front to back above the gas tank strips. Two of these have small pegs which fit into holes in the cushion bottom. In this way the cushion can be lifted at the front and moved forward or backward.

NOTE: On both body designs the lower and upper cushions connect where they meet. Thus, at least the lower part of the back will move with the lower cushion. Unfortunately, your shoulders and arms will always be same length from the steering wheel.

Seat belts? Unheard of in the 1930′s and 1940′s.

Seat Adjuster 2

Premature Body Rust

Thursday, February 11th, 2010

Did you ever wonder why the 1934-46 GM trucks show major rust on their horizontal flat sheet metal? The mystery is solved! These pictures show without a doubt what a wonderful home Chevy and GMC trucks provide for field mice.

After the truck has been abandoned at the edge of a pasture, placed in a salvage yard, or just stored in a shed after harvest season the little rodents soon find them. When the trucks are left alone for 5 or 10 years, just think of the 100′s of generations that have called them home.

This 1940 1/1/2 ton was recently trailered to our shop for a visit. It was removed from a Central Kansas field a few days before after years of waiting for a new home. It was being taken to Western Pennsylvania by its new owners Robert and his son Robert Galet of Jeannett, PA.

What a perfect place for a mouse house. No wind or rain and probably no snakes! The little guys just keep bringing in more nesting materials. They make more and more babies and of course we know what else they do that rusts out the sheet metal.

Attached is a picture of how this 1940 Chevy looked shortly after he got it to his home. The other photos show what was in place when they raised the hood and opened the doors. It looks like Robert Galet and his son will have a big clean up project. We don’t need to guess what the sheet metal will be like!

You can contact Robert Galet at rgalet@hotmail.com

premature 1

premature 2

premature 3

premature 4

Premature 5

1936-1939 Glove Box Lock

Thursday, February 11th, 2010

This early glove box lock assembly has a weak point that makes it difficult to find complete. Its die-cast vertical pointer is held in place by a small steel tension spring. After the truck sets outside abandon several years the spring rusts, breaks, or otherwise looses its tension. This allows the pointer to fall out and the glove box lid will no longer stay closed.

Most all locks you find will be without their pointer. The enclosed photos show a complete lock with pointer as it must be to operate.

Glove Box Lock 1

These locks do not have the ‘push button’ mechanism as the later design.  A small spring button attached to the dash moves. With this style, you pull on the key knob in the door when it is unlocked to overcome this spring button.  You don’t have to use the key to open the door.  Just pull the lock knob.  To lock the glove box door, just turn the key and the pointer moves forward.  The door is now locked.

During the beginning months of this 1936-39 lock, a different key blank was used. This blank has not been available for many years. If you need the early style your local locksmith may not be able to provide a key! (And the search begins.)

Glove Box Lock 2

Glove Box Lock 3

1936 Fender Change

Thursday, February 11th, 2010

It is quite surprising to realize that for 20 years auto and truck makers did not make a simple needed change to their vehicle front fenders.

Somehow major car and truck companies picked 1936 as the year it would be introduced. Did they all get together and make the decision, was it government encouragement, or ____?

The addition was side extensions or skirts. Prior to this pedestrians, side walks, pets, and building fronts received more than their share of mud and water from passing vehicles. With more and faster vehicles on the road, the problem must have been very annoying. The greater the speed when you hit mud or a puddle, the further the slop was thrown. No doubt many diaries had a page that described the results of this while walking to church in the Sunday best.

The modification in 1936 was not a cure-all but it did help the problem. The following pictures show the open sided fenders on a 1934-35 Chevrolet truck and the 1936 with the change.

1936 fender change 1

1935 and Older (above)

1936 fender change 2

1936 Fender Change (above)

1936-1938 Cab Windlace

Thursday, February 11th, 2010

It is so unusual to find an unmolested mid 30s truck! When this all original 21,000 mile 1937 GMC appeared at a recent New England truck show, we had to take notice having never seen the correct installation of the small 3/8′ bead cab windlace on an early model. Our camera did some recording.

Left Side Cab Lace

Left Side Cab Lace (Above)

Right Side Cab Lace

Right Side Cab Lace (Above)

Rumors from a few past customers were correct, the attaching position at the upper front door corner changes. Take note of the way the two pointed windlace ends meet when the door is closed. On the top and back side of the door opening the windlace is attached to the cab. At the front, the vertical piece is secured to the door edge

Gap Cab Lace

Note the gap between the two pointed ends of the welt. Some shrinkage after 70 years.

1936 Cabs

Thursday, February 11th, 2010

1936 Cabs

Three times during Chevrolet truck history there were mid-year body changes. This was in 1936, 1947, and 1955. These changes involved very few modifications to the bed and mechanical components, but it was the cabs that received the near total facelifts.

In mid 1936 a major cab change occurred. Prior, they are referred to as high cab (mid 1936 and older) and later the low cab (mid 1936 and newer). The earlier style is a more square cab and has few style differences from trucks of the 1920′s. Structurally, they used internal wood frames to which much of the sheet metal was attached with nails and screws. This makes a strong, solid quiet cab when new but often results in a shortened life as dampness, dry rot, and loose fasteners take their toll.

A few other specifics on the 1936 high cab.

  • 3 Door Hinges
  • Rectangular Rear Window Frame
  • Windshield Frame has two lower rounded corners and two upper square corners
  • Windshield Frame is swing out manually with a slide on each side. A hand turned screw tightens down on the side to hold the frame open
  • Built in Body Exterior Sun Visor over Windshield (see diagram)

The newer low cab reflects the modern rounded body, a styling that had been introduced in all mid 30′s cars and most of the competition’s trucks. The only cab wood remaining was two front vertical internal posts and two horizontal side sections to help reinforce the door weight.

A few other specifics on the 1936 low cab

  • 2 Door Hinges
  • Round Corners on Rear Window
  • Windshield Fram opened bt crank handle in center of dash
  • Windshield Glass 12″ high with all four corners rounded
  • No changes in the cream colored dash guages

 

Brake Pedal Pads, True or False?

Thursday, February 11th, 2010

The rubber quality on Pre-World War II vehicles was fair at best. Its useful life was limited. Thus, GM engineers did not add rubber pedal pads to early trucks. They were aware of the heavy abuse so many commercial vehicles would receive. In an era of limited income, GM knew few truck owners would never replace their pedal pads.

The solution was to add rows of bumps on the pedal surface. The leather shoe soles of the driver then prevented his foot from sliding across the pedal while driving. These bumps usually outlasted the life of the truck.

Brake Pedal Pads

Brake drum Wear 2

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