You might investigate changing the differential gears instead of putting in an overdrive. While you'll loose some of the low end it has now, you might be able to pick up some speed.
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...
