Junk yard axle swaps are not easy. They also are not cheap. Just in the front Dana 60 Ihave:
Junk yard axle: $800
Gears n such 300
Machine knuckle and add high steer arm $350
Locker $600
New ball joints $200
Custom tie rod $200
New break pads and turn rotors $100
Brackets $500
Have the front unit bearings milled for 35 spline axles $200
35 spline outer stub shafts$ 300
Drive flanges or warn hubs $250
About $3800 in parts and 40 or so hours of labor. I may have left something out but thats close. It's amazing all of the little problems you run into. Just having to move the frame side track bar forward 1.5 inches is a real pain when you have already spent 35 hours working, cutting, grinding and welding. If you are not capable of doing it yourself I'm sure a shop would charge 80 bucks an hour it might only take them 30 hours but that's another 2400 bucks. Look for a rubicon take off axle and save some $$$ not to mention you can do the swap in your garage in about 3 hours.
Oh did I mention I also had to buy new wheels....