I have a 2004 Sabercat 700 EXT. The problem ; if it is one it is nothing that just showed up. When running down the trail at speed it makes a low pitch howling noise from the drive line; from the track area. It does not cause any issues but it gets loud and annoying after a long day. This sled is all stock, no studs, all the bearings are good. Across a lake in six of powder there is no noise. Muffled I guess. Any ides? Thanks, Scott