you will have plenty of lift. there are alot of peeps on here funning 37+ with only 3inch lifts. what do you plan on doing with this rig? if its a trail only rig. then you can do square drive lines. if you going to drive every day then you can do a square front and get a rear one made. as far as the transfer case, i think you mean your drive lines, if you do a square front you can use that with a duel but the rear will need to be changed