[autopat]

Q-ship is correct, there are in fact several different "10 bolts" out there. There is the POS 7.5 in all 3rd and 4th gens, and that includes the aussie 9-bolt, there is the 64-71 8.2" POS. Then there is the tried and true 8.5", which has been in use in almost every GM car and truck, at one time or another. I have seen this rear end deal with an honest 650hp, at the wheels, now granted that's after some mods (IE better axles,fully welded tubes, spool or Detroit locker), but they do live and thrive in that environment. I have also seen 12 bolts (8.875") blow up behind a 6 cylinder in a 1/2 ton short bed truck, but I've also seen them live behind 600 lb/ft, under a big block Chevelle. It all depends on what you like, the 9" is a stout piece, no question, but there are alternatives out there that may be easier to find/adapt/pay for. Just depends on how much power you want, and how deep your pockets are.