You need to check if the electric actuator on the side of the transfer case is getting power. If it is, make sure the terminals are clean and tight. If they are, remove the actuator and have it checked. Chances are it is bad.
If the actuator is working properly, make sure the vacuum lines to the front differential are attached and receiving vacuum.
Let me know what you find.
Joe
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Monday, January 11th, 2010 AT 10:45 AM