I need a little info before doing this myself or taking to dealer. The Dakota will jump in 4 low or 4 high,without turning the knob, then jump back all on its own, the switch will still work if turned to either. After another escapade last nite, drove home in 4 low (till the driveway)then normal, sitting in park touched the brake pedal, right back in 4 low. With the key off and out i can still hear it trying to move in and out. ANY IDEAS, HELP