revytrucks, thanks for the post. Helps a great deal. i have the same issue as jackpinner and that is my 4 wheel will engage in high or low range but when I shift back to 2 high it does not disengage. I turn the truck off and for awhile then restart and it is back in 2 high. The question is how do I know that the front hubs are not engaged because it seems fine. I am planning to get to the dealer to purchase the range sensor but can't replace it today. I don't want to harm the truck. Thanks again!