I have a 1-ton frame with a 14-bolt and 3.70 gears I got from a guy who used the cab on a hot rod he'd built.

He said the 216 with an SM420 just didn't have enough beans once he installed the 3.70 gears.


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...