Ok I have a 1999 Polaris Sportsman 500. It is 4 Wheel Drive but for some reason it started out with the reverse sounding like it was scraping the teeth off and then this weekend it does the same in High and low. Sometimes it gets stuck. But we have NO reverse now and the High and Low is fine but sometimes it falls out of gear and is hard to get back in. We haven't stuck it in any mod or anything like that. We have owned it for about 2 years. What could be the problem? We also know that it had some tranny work done before my bought it. Thanks in Advance.>: