Thats a toss up really, if you think you want to keep 33s for a long time, get the 4.88s. If there is a chance you might want to go bigger down the road get the 4.7s. either way you are going to see an offroad improvement, the better obviously with the 4.7s. I think since its not really a street driven truck just go with the 4.7s you will love them offroad.