Because you don't use the 4wd very often, chances are one of the auto hubs. The best thing to do is make sure that you use it more often. If it happens again, put the truck in reverse and back up about 10 feet. That should make it better. Also, consider having the front diff serviced since you have 100K on it as well as the transfer case and rear diff.
Let me know if this helps.
Monday, December 29th, 2008 AT 3:43 PM