I have a 2008 800 sportsman that sounds like it is a piece of junk going down a hill it has 25 hrs on it !! With the ADC on it is even worse. My dealer is no help they say it is normal !! Anybody have a clue as to what is going on ?? I take pride in my quads and this noise is very iratating ! I have a 04 500 that has never given me serious problems so I dished out 9000 for this 2 cyl quad and I feel like I got a cement mixer !! I have changed the frt demand drive fluid and the tranny fluid and no diference. Any help would be greatly appreciated !!