I bought two 2.5 ton trucks I will be keeping one set of axles for my buggy project and parting out and selling what is left. My question is. I am going to put the motor which will be a cummins 12v in the rear. It will have a divorced transfercase. Should I use the 2.5 ton transfercase from the truck or should I find a np205? Is the military transfercase air shift or manual? The rig will have air bags for suspension so it will have a air compressor.