BS. 14 RWHP...whatever he is snorting must be good. The ring and pinion are only one weak link in a 7.5" 10-bolt. There is a reason I had a 12-bolt under my car before I even had headers.
Sadly, some people might be dupped into buying this, throw a bunch of money into the rear end, and still end up needing a 12-bolt/9"/Dana. You are better off just buying a new rear, and selling your good rear for $300.
BTW, if you add in the price of C-clip eliminators, upgraded axles, good posi, rear end cover, bearings, ring and pinion, you are approaching the price of a 12-bolt. So for anyone buying into this BS, don't...go buy an aftermarket rear and save yourself a boat load of headaches.