Have two friends with the Olds 12 bolt. Both have pulled their hair out trying to find replacement parts for them. First friend gave up and had me swap in a normal BOP 10-bolt rear and not being a racer the Pontiac 10-bolt will last him forever. He left the Olds rear with me and before I could dispose of it the other friend needed an axle and couldn't find a source. I gave him the rear and he then found out that Olds went to a different taper on the inner splines and the donated axles wouldn't slide in his unit. Spline count was the same and his old good axle would slide into the fubar'd donated rear but not the other way around.
Personally, I'd go with any other rearend and run away from the Olds because sometime, somewhere you won't be able to find parts for the orphan.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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