I just upgraded to the aluminum differential cases before I ever started the truck. The stock cases, as well as the aluminum ones have 3 screws in them, not the 4 that was mentioned earlier.
I pulled the 2 bottom king pins to allow the A-arms to pull the wheels out of the differentials, I also removed the skid plates. I guess I should have read this earlier. O-well, I learned more about the truck then I would have, if I hadn't taken it apart as much. Not a bad job. I was a mechanic of diesels for 6 years in the Army, those tanks and trucks were a tad bit bigger then these things