I know I replied somewhere else, but I would NOT regear your transmission and transfer case. If you want taller gears, I'd either go taller tires as winchested suggested (though that can introduce handling concerns) or have the front and rear differentials regeared. If you have a tach today, you can see what RPM ranges you're using in your drives now, and you can then easily calculate what change from current gearing would benefit you. You might have 3.73 gears now. If you do (you'd want to confirm this), you could go to 3.08 or even 3.43 and it would drop the RPMs for the same gear and speed proportionally. For example, if you're running at 2500rpm at a certain speed now, and go from 3.73 to 3.08, you'll drop about 400 RPM to go the same speed.