I was riding today and my sled started to vibrate real bad right about under the tank. 2001 ZL 500. I stopped and looked under the tunnel and there was a lot of ice but I dont think that would have caused it. It starts real bad around 45-50 and it gets worse as I go faster, 75-80 is were it is the worst. I was thinking that maybe the track was loose but I am not sure. Dont know how to check. Or maybe something with those plastic gears that drive the track?? <<I am just guessing based on thats were I think the vibration is coming from. Any info would help.