i know i'm a little different than u street guys, but look at what i turn. 44" tires off a trans brake at 5,000 with 860hp. and how often do you jump yours 3 or 4 feet in the air like we do!! 3rd member, ring and pinion, axle housing and 35 splines are all strange and are pretty dang tough for the money!!
never ran mark williams, but i know it's good stuff too, but pricey.