Newbie owner. 1994 Ram 1500. Previous owner told me to put tranny in neutral, pull transfer case into 4 Low, flip switch on dash. I've done this several times & not working?? Front drive shaft is turning but wheels aren't spinning. On ice/snow on hill in my STEEP driveway. Do I ned to dirve to get the hubs to lock in or do I have a switch and/or wiring problem?