u- joints

Which one to use depends on a lot of things; power, weight, tire size, foot brake, trans brake, 4 spd car, etc.

I am aware of people going 9's on a regular basis (one guy said "less leverage") using solid body, non-greaseable 7260 (small) joints. Others go straight to 1350's. I was using 7290's (65 Barracuda 3020lbs with me in it, me 175lb, car goes 11.1*), had a failure though it was NOT the u-joints fault, the bearing seat in the drive shaft failed. In a fit of paranoia I went to 1350's, in retrospect another drive shaft with 7290 joints would have been fine. I beleave the shaft failed due to metal fatuge, before I put it in my Barracuda, it came out of an old Cordoba.

So in the end, what I'm saying is start with a brand new shaft, ends, yoke, etc, use solid non-greaseable joints, 7290 joint will be just fine.