GEAR DOWN !!!!!! The problem you have is an OLD problem... Some say clutch clutch clutch. These sleds are set up gear wise to protect the D/D. Cat refuses to gear these monsters down due to THEIR COPY of the drive case. With a little care and some ingenuity gearing down is THE MOST effective way to increase belt life. I would like to put one these 1000's on a stand with the recommended lower gears and see what kind of track speed it would pull. 70 to 80 mph is ALL you want with a naturally aspirated engine, unless it's a monster big bore or, if it is turboed with heavier weights in the clutch then you might get away with higher gears. As it stands though put that sled on a secure stand, warm the engine, hold it wide open and see what kind of track speed you get and GEAR DOWN as needed.When I buy one of these I will gear down to 54 /66 if tere is gear set that low and bet that the track speed on the stand will still be 80. Gearing is key long before clutching,, I don't care what some of these shops say... Look at it this way say you build a really fast street car,, gear it high and try to drag race it. Will you try to change the clutching to improve performance? or, GEAR DOWN? At some point some of you guys have to make a decision,, Do you want a mountain sled? or a trail sled. Both is impossible, if you want to go fast down the trail buy a trail sled, if you want a mountain sled gear them down and go ride in the mountains...