As far as the shaft size goes I've been told by alot of junk yards, I'm sorry, Auto Recylcle centers, that only 71 and 72 axles will fit in a 71-72 rear end. Not true! I've used a posi, housing and all, just pulled the axles,from a 68 truck- with 72 axles. The 67 axles are shorter and won't fit. take both axles from a 6 bolt "68-70" drum and a 5 bolt axle and there the same length and seal diam. Just a little info I've found. Junk yards around here always want more for a 71/72 posi than they do for a 68-70 one and they will work!
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1972 Chevy S.B.Pro street,1996 Z/28 Convertible,1989 Camaro Convertible,1967 Olds Cutlass Convertible, 2000 Monte Carlo SS
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