I have had this problem for a few months now. When I'm driving and put it into 4 hi, the 4wd light comes on the dash. But after a while it will say SERV 4WD. I will try and put it back into 2WD on the selector switch, but it will only flash or not turn the 4WD light off of the selector switch. Now when I'm driving the 4WD light on the dash will start coming on even when I'm in 2WD. It will go on for a few seconds then off. I have about 98k miles on a 04 Quad. A couple of times I heard this hard squeeling noise when I successfully disengaged 4WD while driving. If anyone has had this problem, I would appreciate some suggestions before I go blindsided into a service department.