If you have a 3 in body lift you might get it on the truck but plan on benching it , it would be a good time to reseal and check it out. If nothing else a chance to clean it up and paint it some obnoxious color so everyone can see it lol just remember to fill it back up with 50 wt motor oil. I run kendall nitro 70 in mine and it shifts great and makes no noise what so ever it was what was available cheap like 2 bucks a quart. It was 20 yrs old lol
truthfully the assy of the unit should be pretty straight forward. If you can get the case off without droppin it on your head you can figure it out .