50 years ago I put overdrives with a .70 OD in 3/4 tons and thy were fun to drive. I am in the process of putting a 302 in a 50 GMC 3/4 ton like I drove in high school. I am having serious reservations about an overdrive. There is too much traffic these days to be going something that has such a long stopping distance. 50 years ago the big danger was going around a corner too fast and turning over.