last two rides have been deep powder days! reverse works fine unloading and on hard pack. But in powder and off trail the helix on the driven is not locking in the notch, and the sheaves are open with no belt tension and also makes loud ratcheting to grinding noise. had DD apart between rides all looks good there. Also when shifting to forward the grind noise was present, unloaded the track and spun, and was back to good and finished the day. But i'm concerned about failure. Still new to cat and appreciate all help thanks!