Originally Posted by Niz1500dcrcp
Is 4WD AUTO putting the truck into 4WD that's meant for dry roads?
Correct it is used for when you shouldnt put it in 4WD lock. For example a road that has a light dusting of snow, and it wouldnt be wise to use 4WD lock (high) due to some dry patches.
Just an FYI, keep in mind that if you use the 4x4auto and it kicks in and out (stop and go) then it is a lot of stress on the clutches in the transfer case. Which can lead to premature wear on the transfer case.