X2 and most find out otherwise, the first time they decide they want to actually use that "4x4" for what it was meant for. I was only a week or so into my 16th birthday when I found out that 4x4 wasn't really four wheel drive. It is truly amazing what you can do in 2 wheel drive with a locker, throw it in 4 wheel drive, and it's night and day, add a front locker, and you are entering a whole new ball game. I won't own a rig that see's any amount of trail time, without throwing at least a rear locker in it.