STUDEBAKER PARTS INTERCHANGE WITH CCKW

[joel gopan]

The Split Axle CCKW has a lot in common with the US-6
I have a NOS Studebaker Transmission Cover on my CCKW along with a mixture ofNOS GMC and Studebaker boxed parts in a Warner Transmission Case. I also have NOS Timken marked Pillow Block out of STUDEBAKER Box.

[armydriver]

cool

[joel gopan]

What's cool?

[armydriver]

That parts are interchanageable between the two trucks.

[joel gopan]

WWII Army Ordnance had personnel who took a common sense approach to parts commonality whenever possible. Post war there was a lot of deception where the same part could be found with a half dozen Ord Numbers. One example is the Pioneer rack as found on the M-35 series truck, it could be found with several numbers on different applications, especially on Armor.

[armydriver]

Thanks.

[dr deuce]

Joel stated:

>Post war there was a lot of deception where the same part could be >found with a half dozen Ord Numbers.

I believe that the same happened in WW2 with GM with a slightly different twist.

If you look at some of the things they did with the CCKW, 1.5t chevy and later M135/211, you will see a lot of strange things.

Just in Generator pulleys, there are quite a few with some not fitting the other WW2 product.

Chev and GMC had different locations for the added mil switches. That creates 2 different wiring harnesses.

Fenders: why are they different? They interchange but are built different and have different pn's.

Fuel filter location

Why is the REO M35 master the same as a GM CCKW, but the GM M135/211 is different due to the location of the check valve.

I could go on, but some of these differences make no sense especially when they made some major changes to the CCKW and Chev during their production runs.

[joel gopan]

As for Check valves removed. The CCKW 3rd Series (Fat) Hydravac required the removal of the Check Valve from the Master Cylinder, as having two check valves can cause lock up. The design of the Bendix Air Over Hydraulic Booster used in the M-211 included the check Valve in the booster, which required that the Master Cylinder be without one. I am going to venture that GM used an existing booster from the market when it designed the M-133 series line of trucks. The M-35 used a Midland booster which had no check valve, thus the Master Cylinder included the Check valve. Why did the M-35 use a different booster than the M-135? I will bet that it had something to do with the M-35 having 6 Wheel cylinders, and the GMC M-135 having 12 Wheel Cylinders. These are not the identical parts using different numbers, as they are for two different systems. The Pioneer rack was an example I used as the ones for the M-series are identical, but change numbers several times when applied to the different applications on other wheeled and tracked vehicles. I am going to guess that there was some sort of a retirement gift for the Officer in procurement for arranging the mix up.

The M- Series REO, CCKW and M5H6 all use the same Master Cylinder Design. M-series Reo has a different Ord number because of the cap that is designed for Deep Water Fording systems that Post War Tactical Vehicles had.
Another tidbit is that the MBT/BT3/M-417 Trailer all use the same backing plates and brake shoes along with some other parts. Six decades of Army Truck experience gives one a lot of little secrets on all Army trucks. We are getting a little off topic, aren't we?

[joel gopan]

I believe that the difference in Chevrolet 4X4 Generator pulley and the CCKW pully is due to the physical characteristics of the Chevrolet and GMC Block and RPM differences.

[peter de vries]

Does anybody know just how many parts are in common between the CCKW and the Studebaker US6 ? For some reason the GMC trucks are quite outnumbered down this end of the world by the US6 trucks. I wonder if the Timken axle GMC trucks and US6 trucks share the same interchangable axle assemblies... A neighbour of mine is looking at buying a US6 for farm use. Any help appreciated, regards, Pete.