Sooo... We put on about 70 miles on saturday, north of Anchorage in the Petersville area, we rode the Toakasitna river up to the glacier. When we got close to the glacier the snow became deeper than we thought, about 18 inches of fluff on a 12 foot base. Broke in a new belt on the way up and low speeds and mid thottle. Beat on it pretty hard on the way out and have absolutely no problems at all. one long stretch at about 75-80 mph for 20 minutes solid and when we stopped, the clutches were warm to the touch.
I still need some waist deep powder to see if the fix is for real, but at this late in the season, I may have to wait till next winter...
For now, if anyone here is experiencing belt overheating with thier REV's, I strongly reccomend geting the drill out and popping the rivets on the cover for more airflow.