well after looking at all my options for now I am just going to up grade the 7.5 [-o< and pray it holds for a year or to. this is what I got. Moser 7.5 Chevy rear, 28 spline, 28 7/16" long Axles, Auburn Pro Series 10 Bolt 7.5" (3.23-up) - 28 spline Differential, moser Performance Rear Cover, 3.73 Gear and UMI UCA and LCA. Any thoughts on how long this will last the car will see the track 2 maybe 3 times a year at most. No trans break,450 HP MT ET streets 28x10.50.