Sounds very unusual!, what a bummer! Sounds like your transfer case locked up in the front? In my last three Jeeps I have installed a bypass switch that turns off the ABS and Traction control. I saw the post about the BFG Mud terrains are bad in the snow, I have to say they are fantastic in the snow if they are siped . I live in snow country and have never had issues with BFG"S, but HATE ABS and traction control in the winter!