Okay this is what I've got, Ive got a 82 silverado k10 4x4, I know its got a 10 bolt rear end, but i dont know what size it is ( like 8.5 or w/e) I was wanting to put like 4.10 gears in it with posi or limited slip. Let me know what it is and what parts to order, COST EFFECTIVE, please..lol.. and where to get em.