Hi, I am new to the forum. I just purchased a used 2007 Ranger 500 EFI. When I got it I noticed a slipping when trying to go up hill. I was in low range and I would have to let off the gas and then reapply gas to get the drive system to catch. After reading several posts on here, I replaced the belt and that seemed to fix that particular problem. I have also noticed a resonating "whaa - whaa" noise coming from the clutch area I think. This happens in low range and the frequency of it increases as the buggy speeds up. I do not hear this noise in high range (but it does have a high pitch whine that I think is normal for them). Also, it seems the belt slipping has come back. I haven't ridden it much since replacing the belt and most of my riding has been in low range. Thanks for any and all replies.