I have a 2002 TB LT. As long as I can remember the 4x4 has only worked while driving. That is to say if you were in 2 wheel drive and got stuck, you would remain stuck no matter what. Won't go into 4x4 . The vehicle has to be driving down the road to actually go onto 4x4. I have checked with vehicle not running and both differential and encoder motors are working. Not sure if transfer case is problem..or something else. Anyone?