Been beating on this 82 Mustang to race and now I'm at the rear end. The 7.5 has a cracked bearing cap and the ring & pinion are mush. I need to go with 4.56 gears if calcs. are correct, but am wondering if I should loot an 8 or 8.8 rear from the local yard instead of spending time and money on this rear end. Am hoping on 500 to 550 horses to hammer it with and don't know if this little guy can take the stress-girdle or not. Any ideas???