wanted: Chev CMP chassis views

[Hanno Spoelstra]

Originally Posted by Tony Wheeler

Getting back to your question Hanno - the CGT frame is nothing more than a C15A frame. Unlike the FGT frame, which is a modified F15A frame, there's no difference between the CGT and C15A frame. Likewise throughout the whole CMP 4x4 range, because unlike Ford frames, all Chev frames were built with a winch crossmember. It's sometimes suggested the CGT frame is different by virtue of double skinned midsection, but that's standard on the C15A frame.

"It's sometimes suggested the CGT frame is different by virtue of double skinned midsection, but that's standard on the C15A frame"....

.... but according to the information in Is the FAT a 60cwt or 15cwt truck?, none of the frame side rails listed in the CGT parts manual match the parts listed in the C15A parts manual.

The CGT parts list lists 4 types of frame rails, without and with reinforcements, while the C15A one lists 2 types of frame rails, without and with reinforcements.

H.

[Tony Wheeler]

Originally Posted by Hanno Spoelstra

The CGT parts list lists 4 types of frame rails, without and with reinforcements, while the C15A one lists 2 types of frame rails, without and with reinforcements.

Very interesting Hanno, I wonder where the variation occurs. The parts list description "MEMBER AND REINFORCEMENT ASSY" suggests to me it's related to riveted crossmember fishplates, rather than welded double skin midsection, which may have been present universally. In other words the siderail part may have been supplied with fishplates already riveted in place. I notice they're listed as 1st type, 2nd type, etc., which normally indicates design changes over the years. This occurred with F60S/L frames too, with late production frames featuring additional rear crossmember fishplates. I guess the only way to know is to inspect surviving vehicles. We need C15A and CGT owners to submit chassis photos for comparison.

As you point out, the rear crossmember fishplate differs on winch equipped chassis, to accommodate the rear fairlead assembly. This applies to both Ford and Chev frames.

[Keith Orpin]

Hi Hanno,

Apologies for the late response, been a bit busy recently. Having read the conclusions on the differences between C30 and C60S chassis, I have to add that certain C30 chassis were actually fitted with brake booster systems, although it's NOT shown in MBC1 or 2, nor is it mentioned in the parts catalogue!

My C30 LAAT (20/08/1942) has the following :

• Small 5" knuckles
• 11 leaves in the front springs
• 12 leaves in the rear springs, + 4 helper springs
• Brake booster and additional riveted brackets on the chassis.

I have to say that the brakes work really well on stopping 4.5 Tons of Chevy.
I'm sure Rob Fast in Canada has a C30 of a similar year, so maybe he can verify the above info.

Best regards
Keith

[Hanno Spoelstra]

Originally Posted by Keith Orpin

Having read the conclusions on the differences between C30 and C60S chassis, I have to add that certain C30 chassis were actually fitted with brake booster systems, although it's NOT shown in MBC1 or 2, nor is it mentioned in the parts catalogue !

Keith,

Thanks for letting us kwow about your C30, the brake booster is definitely a variation on a theme.

Thanks,