Hello All. I am having a problem on my 500 x2. When I am in Low Range and exceed 15MPH the quad starts to 'shudder'...once I get below 15 or so it immeditaletly goes away. It never did this when it was new....I do not normally drive this quick in Low but ocasionally I will reach it for short periods. I was thinking it might be the belt or something in the tranny....Have you guys had similiar experiences?