I have a 2000 Polaris 550 Indy Trail Touring with reverse. I purchased it used this past Fall. Now that the snow has come I've been able to put it through the paces. One thing that really stands out with this machine is the chain case whines. Now, would this be due to the extra gearing (reverse) For what it matters, I'm using the genuine Polaris chain case oil. Any suggestions would be greatly appreciated, I hate to be 25 miles out and the chain to fail.