rear disc brakes on 8 3/4

Its funny how we'll pay anything to go fast, but to stop we want cheap. This is hilarious to me. Anyway, The dr diff/ford based setup is the best thing going without stepping into fixed caliper territory. I wouldn't touch any of the kits that use that crappy Cadillac caliper that sucked when they were new - junk. Same with any kit that uses a multipiece bracket. The Ford based stuff uses a one piece billet bracket and a very common caliper. As far as stopping is concerned the rest of the system needs to be dialed in regarding bias and enough line pressure. Most people are disappointed with 4 wheel discs because of this . I run the ford 11.75 setup in the rear and 14.25" fronts and the braking is breathtaking even in track conditions. My advise is don't cheap out on something that could save your life.