I have a 2002 650 prairie that the 4x4 works great in most conditions. It goes in and out fine. When I go in water or mud that is about to or above my floor boards the front diff locks in and out. To put it a little easier, when I put in back in 2 wheel drive and take off it will be stiff and pull to the right (just like I was pulling and letting go of the locker) . It doesn't do it the whole time it is in and out. Usually I can switch the 4x4 button on and off three or four times and steer left to right and it will stop, but sometimes it has to sit overnight. If I'm not in water or mud the 4x4 doesn't do this. At first I thought it was my locker sticking, but it does it wheither I use the locker or not. If anyone can give me some ideas what to check or what it could be? Thanks