Thread: Early GM posi question

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In my old '56 Buick, I had that exact unit. Third member experts always said they could take a lot. When I dropped a 502BBC in it, it failed, not badly but an old school hot rodder told me what to do and it worked very well. We took the ring gear to the surface mill and knocked the lugs off. Built a precision fit spacer (not the aftermarket style you can buy), stepped up to grade11 bolts with GM loctite and the darn thing still runs to this day with a 540 BBC in it with not one failure. Just food for thought. By the way, the whole purpose to keep the OEM axle and member was for a touch of originality.