Just found out 4wd lock or 4wd low does not lock transfer case mechanically. It just locks the clutch quicker when exceeding 2mph. When you put it in park with ebrake on only the rear wheels hold you. On an icy slope the rig will slide backwards like a 2wd. I have to get a board to jam brake pedal on if stopping on an icy hill. Cripes !!!
Applies to 2014 and newer Ram 1500's.