Sorry to blow all the expert posting to bits, BUT I have a copy of the 1980 Ford Pinto / Bobcat spec sheet clearly showing and stateing that 8" rear ends were installed in 1980 Pintos. V-6 you say! Nope because that option was droped in 79. This copy came from the main libary in Detroit. At one time they would fax it to you for free, but now unless you live in Detroit, and have a libary card, it'll cost you $100. I've been told by Ford insiders, that at the end of a model run, Ford would use any part they had on hand. Why use a 8"er? Gears / posi's / drop outs / etc / etc. Try it / you'll like it and you'll never have to weld another gear and hope it doesn't brake.