I have 3.08 gears in my 55 1st Suburban. It cruises at 55 turning about 1500 RPM. I don't remember what the tach says at 70, but with the GMC 270 it will easily run 70+.


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...