THe front axle is actuated by electric or vacuum. If the truck has auto 4wd, it will be electric. On the front axle, you will see an electrical plug that goes to the actuator. Unplug it and make sure the terminals are not corroded or broken.
Let me know what you find.
PS: When I say auto 4wd, that means the 4wd engaged automatically when the rear tires spin. Most of the trucks had to be put into 4wd with a switch.
Sunday, March 21st, 2010 AT 9:41 PM