So we had a little too much fun today. kicked up a big mud pit then hooked up an old car hood to drag people around behind our 98 Polaris xpress 300. After about four rides, the chain started slipping off the rear sprocket and binding next to the rear disc. I am thinking we might have possibly jerked the rear end out of alignment. Haven't been able to look at it because we really got into the mud, and it was right at dark when this happened. Maybe when I wash it off later this week it will reveal the problem, but figured maybe someone else had experienced something similar.