Unless you are stuck on swithing to a 12 bolt diff, don't underestimate to strength of a 8.5 inch 10 bolt. They can be made to handle a LOT of power. A good friend of mine is running his 4000 lb street trim 76 TA well into the 10's @ 128 with a 10 bolt...granted, his posi needs to be rebuilt every now and then, but the diff stands up to the abuse. Just my opinion.
Chris
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