If he had ADD (most likely does) and if you don't, consider swapping your side tube on to his diff. That will the install cleaner and give you a stronger set up. You need a new axle seal and need to locate it in a different spot. If you need more info, let us know.

Also, consider pounding the studs on the side axles out and replacing them regular bolts. That will make install easier on you as well as simplifying it if you have to do an axle swap on the trail. Have a second person helping with the front diff to be safe. It's over 80lbs. Good luck.