Ok we had a 2wd truck that we took the rear end out of and, put in a 4wd truck. The 2wd truck has 5 lugs, and we need 6 lugs to complete the rear end swap, and get the truck back running. We still have the 6 lug axles from the 4wd still in its rear end. How difficult would it be to take the axles from the 6 lug, and put into 5 lug rear end? Bot rear ends are GM 10 bolts with the same size differental. Are the splines the same? What all would need to be done. Thanks for your help!