Ive got a GM 10 bolt carrier that is welded and has a 4:56 gear set, they're used but in good shape, I still have the shims and they are labeled for the side that they belong on...its ready to bolt in and go, its for the 7.5 rear end out of like an s10 or camaro and possible a 1/2 ton chevy, im not sure though, 75 bucks takes it 423 763 8874 call if interested thanks Trevor