Originally Posted by suzuki430
from what i know the hub gets locked in once the transfer case is engaged and the torq locks it in. i'll look in my haynes tomorrow and see what it says. i've heard bad things about auto hubs because when you go from forward to reverse they actually disengage for a second then reengage. but that was a chevy that did that so don't quote me.
That is exactly how these work, and presents a problem if stuck because it will break the hubs. For a quick easy example think of the pull starter on your lawn mower, same basic design. There is no vacuum, or electrical connection to lock or unlock the hubs. If you remember to reverse the direction of travel you will unlock them and then freewheel without turning the driveline.