What are the differences in chassis between the 54 and 56 450 GMC's. I know the body is very different.
Both have 302's
Wheels and tires
brakes
Rear's (both 2 speed)
Tranny's
Frames
hoist and flatbed
Driveshaft
springs
The 56 had an automatic which was switched to a 4 speed. Wasn't there some frame changes that needed to be done to support the different transmissions.
The 56 might be more of a parts truck for the 54 in time.
I hope I am not asking to much.
