i run 355 powerglide in my rampy. i run 205x70r14 which seem as big as i want stuffed under there. yup it runs at higher rpm than i like but need the poop sometimes also. product of 2 spd trannys. if engine is ok it should go a long ways. i have put a lot of miles on it at 65-70 mph this year with no real problems. regards tim colson put N2VZD in your browser window for pictures