Foot brake street cars, 10+ years of driving street & strip, all 8 3/4's with aftermarket axles, stock sure grips (both styles), most runs during this period in the low 10's with weights from 3240 to 3510, best ET's in the 9.4's with 1.39 60 ft times. Three cars, four rebuilds over all. One total gear breakage, others rebuilds were because of wear. At some point we backbraced them, and in one rear added cap preload bolts. Anyway, in my opinion they were pretty much trouble free. If you are starting with nothing and building a powerful car, I would go with something else. We chose Dana because it's less money, but now I wish I had gone with the 9". Lighter, easier to work on and everyone has parts for one.