Why would you go backwards from a superior 8.5 Corp in 73 down to a 8.2 ? Pinion diameter reduced also from 1.625 to 1.438 .. A 8.5 should merely have the center fully welded to tubes and upgraded to 33 spline axles and a 33 spline Eaton Tru Trac would hold up to the new drivetrain... if your not launching at a drag strip it may survive a while OK with 8.2 but don't understand going backward considering what's stock in a 73 and the simple upgrades available
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