Any a-body 8 /34 rear will fit however you will need new axles for the big bolt pattern... what motor you runnin? i'm in the low 13's with my 360 in my cuda, and have had NO problems with my 8 1/4 yet... ( 10 years)
The motor i am running is the 360/380 Mopar Crate Engine. Is your 8 and a 1/4" stock? What gear ratio is the stock ratio for a 8 and 1/4"? I don't know what I have and am curious since I would assume they would be pretty HIGH gears except my engine is spinning 3,000RPM at 65MPH. If I kept the the rear end i have now, which is a real possibility, what companies offer ring and pinion sets for the 8 and 1/4" rear end?