CMP C60 chassis number?
 

Yet again I am having trouble verifying a vehicle for the DVLA.

According to the plate it is a General Motors C60 S built in 1943 but I cannot find any verifying printed evidence. The prefix of the chassis number does not correspond with any shown on https://hotrod.gregwapling.com/chev-...dian-chev.html and so I am stuck.

Can anyone help?

The number is CH 483035W1S1923

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In trying to read your chassis plate photo it looked that it actually read CH 48?35W1S1923 whereas you had put in 30 in place of my ?. I couldn’t see what the number was in the space but it did not look wide enough for two numbers, so I put in a 0.

I searched Google under “WW2 Chevrolet CMP chassis number 48035W1S1923” and got this AI overview. I saved it to a Word document.

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The Chevrolet CMP (Canadian Military Pattern) chassis number
48035W1S1923 decodes as a 1944 model year, 60-cwt (3-ton), 134-inch wheelbase truck. The components of the serial number are broken down as follows:
• 4: The first digit indicates the model year is 1944 (as GM Canada used '3' for 1943 models, the subsequent digit '4' indicates 1944).
• 8035: These four digits represent the model number, which corresponds to a Chevrolet 60-cwt (3-ton) truck.
• W1S1923: The final sequence is the specific serial number for that chassis, possibly indicating assembly information or a sequential build number. The 'S' typically indicates assembly in Sydney, Australia. The 'W1' likely indicates a specific assembly plant or contract detail specific to Australian production.
For more detailed information and a potential database of serial numbers, you can consult the Maple Leaf Up Forum, which is a key resource for CMP vehicle information.
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Lucky I did, because I could not get it to repeat.

I hope this might help.

I then looked at the number stamped on the chassis frame which looked like 43035W1S1923 and got another AI hit.
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The Chevrolet CMP (Canadian Military Pattern) chassis number 43035W1S1923 decodes as a vehicle built in 1943.
Chassis Number Breakdown
The number structure follows the general format for GM of Canada CMP chassis serials, typically including the model year, model number, and sequential serial number.
• 4: Indicates the model year of manufacture, 1943.
• 3035W1: This segment likely denotes the specific vehicle model type (e.g., C15A, C30, etc.) and potentially a plant or contract code. Australian-produced Chevrolet CMPs often had numbers stamped on the left chassis rail.
• S: Could be a plant code or a further model variant indicator.
• 1923: The sequential production number for that specific model type within the production run.
For more detailed information or to connect with other enthusiasts, you may find the Maple Leaf Up Forum a valuable resource, as they specialize in the specifics of these historic military vehicles.

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Maybe a useful clue too?

Hello Tony, here is my take on it:

The listed chassis number is not a regular one as used during WW2. It may well be your Chevrolet was assigned a number sometime after WW2, as Chevrolet usually did not stamp the chassis number in the chassis frame rails - only on the data plate, which has a habit of going missing.

If you are missing data to stamp on the data plate, you may want to use the technique informally referred to as "counting heads." It is based on the ongoing study of period documents and photographs, as well as surviving vehicles. See the thread Looking for Date of Mfg and Chassis S/N information for C15 where we basically did the same exercise for a C15 4x2 truck.

You already found the particular useful source, David Haywards webpage with CANADIAN CHEVROLET GMC/PONTIAC SERIAL NUMBERS AND ENGINE NUMBERS found at https://hotrod.gregwapling.com/chev-...dian-chev.html. It lists a number of chassis numbers for "C.60L".

The basic configuration of the Chevrolet CMP vehicle chassis number is a follows:

• Digit 1: Model year
• Digit 2-5: Model number
• Digit 6-10: five digit serial number

The CMP model number was built up as follows:

• First digit: CMP series "8"
• Second digit: number of wheels
• Third digit: number of driven wheels
• Fourth digit: chassis type (applied sequentially and arguably chronologically as each chassis type was signed-off)

The photo of your truck shows a C60L with 158" wheelbase, correct? The C60S has a 134"wheelbase (see CMP Specifications). The C60S is Model 8442, C60L is Model 8443.
Assuming the date of Mfg is correct, your truck is a C60L built in 1943, so the chassis number should read 3844312345 (where 12345 stands for a 5 digit consecutive serial number).

Hope this helps!


PS: John Carmichael did a nice try using artificial "intelligence". Happy to see "it" is referring to MLU Forum, so it is on the right path to become intelligent ;-)
Here's hoping this type of tooling will learn more from our collective knowledge, so it can help to learn others about CMP vehicles.