May I kindly interupt here, I think Vxciter was asking about the 4H and 4L shifting.
The 4L is when you need max traction. You only do that when you are crawlng or stuck somewhere.
On 4H this is when the system is on Auto / torque on demand. The system will move the front wheels as required .
In short leave your transfer case on 4H all the time unless you a stuck