Charles, with a leveling kit it will change the suspension geometry and bring the axle back towards the cab and it will rub the back of the fenderwells. With 37's you need the long arm leveling kit, which will put the axle back in the right position.
With any lift/leveling kit, it changes the geometry from what it was designed at. Im not gonna argue with you, but you are wrong with having to have a long arm kit. I had an 06 2500 with an 8" lift and used my factory radius arms. Now with the guys tck that had a 2" spacer "aka" leveling kit. He had factory radius arms, ranchhand bumper and was NOT rubbing. I thought it would rub too, but it didnt.
