stock fronts are 46, stock rears are 48. the rear pack needs to have a couple of leafs added to it to hold the weight of the front end. it is a direct bolt up, front hanger does not need to move. shackle will get pushed back, axle moved forward 2 inches, and gain approximately 3-4 inches of lift. do a search on RUF's(rears up front). lots of good info and lots of guys here to help you out. don't forget though, if you do rears up front, you will have to upgrade to cross over steering(another great mod) to make up for the axle being moved.