The 4hi and 4low are just like your old truck, no difference.

The rear locker will lock your left and right rear tires together (I think this only functions in 4low unless you do modifications).

Atrac will modulate the brakes depending on which tires have traction and which ones don't have traction. Use this and the locker if you're out hunting and stuck in the mud.

Steve
My Website ||Gettin' off 4wheel drive club member
'93 4Runner V6 4x4 auto tranny
If you have to ask about a SAS, you're not ready for it.