I cant make u my mind on what i would need, this is my first jeep. I found one with everything i want but its 3.73. I live in the yukon so there are mountains so the 4.10 would be nice for them, but nothing is close and your going 85mph on the roads so the 3.73 would be nice. I wont ever go bigger tires biggest would be 33 and more so just for wider profile. Now if i get the 3.73 and feel bogged down, is it a easy fix to change it to 4.10? Or would i have to replace other stuff also?