well i learned the hard way that not all blazers have the same width rear ends. so before i buy another i was curious if i swap to a disk brake rear end what else do i have to do? Ive been to 5 different yards and having a hard time finding a good rear end. Im looking for a 3.73 locker (GT4 G80). I have found to with disk brakes and would love to have rear disks

 

I believe this topic has been discussed before. You will likely be changing out the proportioning valve.

So long as the wheel mounting flange to wheel mounting flange distance is the same as your rear, you will be good to go. All 4wd rears out of the s-series vehicles are one width while the 2wd rears are narrower.

 

I am a noob here but watch out for the ZR2 rear end. they are different then regulars.