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Re: 10 bolt to 12 bolt swap
Tom nailed it on the head. The truck 12 bolt has a pinion shaft diameter of 1.438 and the 8.5 10 bolt has a pinion shaft diameter of 1.625 leading many to argue that the 8.5 10 bolt is actually stronger. I've had a 8.5 10 bolt that lived (a long life) in a low 10 second full steel body malibu that made over 700 from a stroked big block that also made crazy torque. I don't believe that going from a 8.5 10 bolt to a 12 bolt truck rear end is an upgrade. There is a reason that GM is still running basically the same rear in ever 1/2 ton vehicle they build.
Mike
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All things Chevy truck:
1986 SWB "Jolene" boosted 5.3/4l80e project
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