I swapped in an 8" (5lug) rear end from a 74 (250cid) Mav, into my 70 Mav. Bolted right up, 2.79 gear, but a lot stronger than the 7 1/4" stock rear. It's the same as the V8 version. Good luck, Steve
Steve Wyatt 300 Ford 6 powered 36 Ford hiboy streetrod pickup