I ran into crossmember issues with my 47rh-np205 combo, basically the front driveshaft dropping down to the diff with he 6" lift interfered with the crossmember. I was going to notch the crossmember, but it was hitting right where the bracket from the top frame rail attaches to the crossmember, so notching would have meant losing that bracket. Instead I did a 2 piece front driveshaft, the brackets look like they stop the frame rails from twisting out .