The posi unit is the week point followed by the axles. The 8.5 is stronger that most folks think. I ran hundreds of passes in the low eleven second range (550ish HP) before upgrading from stock axles. My brother started grenading the factory posi unit at the 10 flat mark (700ish HP).... I'd stick with the 8.5 but the 12 bolts definetly gets bragging rights.
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