Looking for a new rear-end
 

Okay, so my rear diff had been going out on me lately and the other day it finally bit it. I pulled the cover and sure enough there was a definitive lack of spider gears. To top it off, when the thing locked and bound, it screwed up my rear leaf springs. Awesome. Okay, so my question is, what Chevy/GMC rear-ends would be interchangeable (given the correct gear ratio) for a full-size 1994 Blazer Sport 6-lug? Hoping to hit up some local salvage yards to try to find something but I want to know what I can draw from. Thanks!