I've done some reading and not really finding a good answer for my situation. I bought a crate 350 hooked to a remanufactured th350 for my 79, 2 wheel drive short bed if it matters. I found out the th350 is really a 700r4. I'd like to use the reman 700r4. I've done some reading and some say to swap tail housing and output shaft etc. If the driveshaft slides onto the 700r4 why would anything need swapped? Wouldn't shortening the driveshaft be enough? Maybe swap speedo gears if they are different?