Hello everyone! I am trying to get some info on how difficult (and expensive) it would be to put a new transmission in a 1965 fleetside longbed. It currently has the stock 4 on the floor and I'd like to swap it out for something will let me go over 65 without redlining the motor. From the limited amount of research I've done, I think the T-56 would be a great tranny, but if anyone else has a suggestion, I'm more than willing to listen. It would be mated up to a 400ci that I plan to have put out around 425 hp and 450 tq. Thanks!