Hi:
On the 4wd, when you push the button for 4wd, you need to check if you are getting power to the electric actuator mounted on the transfer case. That is what actually shifts the gears for you. If there is no power, the switch may be the problem. If there is power and it doesn't shift, you will need to have the actuator checked. It will most likely be bad.
I hope this helps. Let me know if you have other questions.
Joe
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Sunday, January 4th, 2009 AT 12:31 PM