Right now I have an 01 W/ a 2.5" leveling kit sitting on 35's on 20's. Backspacing is 5", rubs the springs & gets on my nerves.
I would look for a 4.5" backspace. It may be different being that you are going W/ a 4" lift. The arch of the leaf spring is going to be different.
I have thought about wheel spacers but I think I am going to try to find wheels W/ 4.25" to 4" backspacing.
Let me know what you end up doing & if it works.