Anyone know what is needed to convert a dually dana 70 to single rear wheel? It's in a 1990 W350 Cummins. I am swapping the drivetrain into my 85 w350 and I don't want a dually. I already have the front axle figured out. I have hubs from a front dana 60 srw. I was doing some research and some guys say the dually axle is shorter. In that case could I just run a wheel spacer?