I know people launching at 7k on slicks with stock 31-spline trac-loc. I know people that have blown out there 28spline trac loc on street tires. I have seen an Eaton grenade on its 3rd pass behind a 270rwhp 5-speed. Its all a crap shoot...the only truly built rear...is a spool. If you don't race much then you'll be ok for awhile....honestly though it could be 5th pass or 500th pass. rears are funny that way.
Adam
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