Ok second post, trying to get that ad off.. anyway. What is the proper uses procedures for the electronic 4x4 on this truck. 99 GMC Z71 new style... I don't have the owners manual yet, the lady is trying to remember to bring it to work for me but memory is as bad as mine in other does it have to be stopped in park, in neutral , 4x4 LOW,,, and then back to 2WD mode..... Do I have to back up for so far to release any locking hubs.... ???? Sorry, I know nothing about this thing and as I said! I have no owners manual yet... - - - Updated - - - Nobody knows how to work the 4x4 ????