I've thought about doing this, pull the factory switch panel and replace it with a blank off a 2WD. Use two Carling Contura's to select High-Low, and 2WD-4WD.
Haven't done it yet, and don't know the details on how to do it yet either....
That way you have that low range power, and the wheels do not jerk like in 4 low. Backing my rig into a camp site sometime I pop the hood and just pull the red wire on my relay and it only goes into 2 low and not 4 low. One of these day I'm going put a switch on it but yet to do it.