If the transfer case will shift into 4wd high, then the unit and front axle are working. If it doesn't go into low loc, then either the actuator on the transfer case or the switch / wiring is bad. Unplug the wiring harness to the actuator and make sure it is clean and not corroded. Also, have a helper switch to 4 lo whille you check for power to the harness. If you are getting power, then the actuator is the problem.
Let me know what you find or if you have other questions.
Joe
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Tuesday, January 12th, 2010 AT 10:43 AM