My street/strip combo: 3950 lb B body car w/driver, 572 Hemi, 5000 stall ATI converter, Hemi input shaft, billet steel front drum, hub, planetary, super Sprag, 3.5" CM driveshaft, 1350 joints, billet yokes. Dana 60, 4.10 Richmond gears, Detroit Locker, stock 23 spline 1967 axles, 1/2 x 3" DC studs. Caltrac bars, mono leafs and shocks. Car has run a best of 9.85 @ 136mph 1.37 60 ft. I Would switch to 5/8 studs but they won't work with the Cragar S/S wheels I run on the street. Next upgrade will be aftermarket axles since Iv'e been beating on the stock 23 splines for almost 40 years now, but I haven't decided if I want to keep the 23 spline Locker or switch to a 35 spline spool.