For the leveling kits the 2.5" kit is the recommended highest you should go because of the severe angles created on your front end if you were to go any higher. If you want more lift than that I'd look into a full suspension lift, but I don't know anything about 3" or 4" for 2WD drives. I'd recommend going with a full 6" lift because once you start lifting you're goign to wish you went a little higher.