So originally my truck came with a open 3.08 8.5 rear end with the anti hop shock but a few years ago i ran a stop sign and got t boned. The axle took the brunt of the hit and it bent. I ended up replacing it with a g80 7.5 with lower gears (don't remember which but my speedo is about 10mph off), out of a blazer with disk brakes. I figured since I am gonna be throwing boost at this thing, I might should get a more beefy rear end for it. Ended up finding one not too far away and picked it up for $175. Took it apart and confirmed spline count and gear which is the same as my truck came with. I will be installing a spartan locker and a dual caliper kit on it when i get the funds.