Eaton True Trac Locker Gmc 2500hd Rear Diff Upgrade 

I put a true trac in my 11.5, works great drives better on the street too

I got a true trac in my 04 1500 after going through 2 g80s in one year now it’s “bulletproof” weakest link is indeed the axle shaft I’ve bent one somehow, the 1/2 tons run a 8.6 rear not as big as a 3/4

what type of tires you run on your truck ? MT?