with 3:73 or lower to 4:10 gears and no wider tham 60-61" wheel mounting surface to wheel mounting surface. Chris 817 -517-3531
rear axle you can put in a late 60s early 70s k 5 blazer with 6 lug not sure what year your truck is mine is a 52 1/2 ton and was able to use my backing plates so brake and e brake set up stayed the same. hope this helps Robert
