Not an easy one to change.
Method one: There is a c-clip in the differential that holds that shaft in place. So to get it out you have to disassemble everything down to the bare knuckle on the passenger side, and the driver's side, then unbolt the diff from the beam. Not easy. Takes a while with all the right tools.
Method two: I have heard however of people just disassembling the passenger side to the knuckle, then using a u-joint press/ball joint press/ or large c-clamp to push the joint out, then wiggle the shaft out (push the two caps off so that the trunnion of the u-joint stays with the outer passenger side axle shaft....then slide it out). Install the new u-joint on the axle shaft, slide it back in, and then use a u-joint press/ball joint press/ or large c-clamp to press the new u-joint's other two caps into the other side of the axle shaft that does not come out of the diff (while under the truck...probably not much fun either).
Comprende? lol long post I know.
Is this truck bone stock?
If you use method one, do the "c-clip eliminator" mod. Do a search on it, its a $3 spring that saves much headache down the road.
If you do method two, don't worry about the mod. However if you plant to fix the truck up and lift it, tires, lockers or gears or any kind of that kind of stuff, I'd do the c-clip eliminator mod and other general maintenance stuff while the whole front end is pulled apart.
For reference I can do method one in about one day, with air tools and all the parts in front of me and drive it the next day. That's packing the bearings and replacing the u-joints. Its a long day though. A 3 day weekend is perfect though...
Method two probably would take just about as long, maybe a couple hours less time.
Good luck, if you have any other questions...ask away.
