I had a similar problem with my 1990 Mitsubishi Montero. What I found was that one of the wheels (front passenger side) was not disengaging after driving in reverse. To solve the problem quickly and w/o too much effort, I installed Superwich hubs which I purchased for a little over $100 from 4by4connection.com ... they work GREAT!!! No more added friction, less wear-and-tear, and better gas mileage.

Just to explain further, after removing my original Mitsubishi Automatic-Locking Hubs, I also noticed a broken tang on the passenger-side hub ... that explains why it wouldn't unlock. I could have rebuilt the automatic locking hubs or maybe found a replacement at a junk yard (who knows what they went through), but I think I was much better off with buying the Superwich hubs as they are superior in performance and probably cost less than the parts required for a rebuild of the originals.

Just one more piece of added information. The "Wheel Lock" light (assuming its working correctly) indicates that the front axel is turning. Ordinarily, in two-wheel drive the front axel should not be turning. But if the wheel hub will not unluck from the front axel, the wheel will turn the axel and cause the "Wheel Lock" light to remain lit, which is not a good thing when you're trying to drive down the highway in two-wheel drive.

Hope this helps!!!

Good Luck!!! <img src="/forums/images/graemlins/smile.gif" alt="" />