don't take this the wrong way but if i have to explain to you about a narrowed rear end and your truck having rear disc brakes then I'm pretty sure you have no idea that your axle is bent
Scott Brown (owner of Monarch Clothing) was the one who built the truck originally. He was the one who told me the rear axle is bent. Plus when I drive the back driver side wheel wiggles.
Thats why Im asking questions so I atleast get some knowledge out of it.
had the same problem with mine when i took it out to get it shortened, it was bent , hell i never paid that much attention to it, the guy that narrowed it straightned it didnt charge me any extra