I have an illustrated parts catalogue for 1978 that covers light trucks defined as 10 series through 30 series. The C40 is probably called a medium duty truck and in a different book.

But I don't know, I'm just guessing based on my 1978 book.

How close to the correct location are ths spring pads on the C40 axle? Or could you perhaps swap the C40 springs too?


1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble...