the problem I am having is this. When you push 4hi or 4lo the buttons blink, the tccm relays click and the encoder motor moves but only a second later it goes back to 2hi. I have changed the encoder motor, the axle actuator and checked the wiring for visible damage. There are also no tccm codes. Not sure what to do next. Any ideas would be much appreciated. Its a 96 1500 by the way.