03 f7 idles fine but wont move

Last winter I was riding the sled and it was running fine. The clutch is an aftermarket clutch as far as I'm concerned, as it doesn't crack open until around 4500-5000 rmps. So, I ended up towing a buddy out of a drift and the sled was really put under load. I know they aren't meant to tow, especially in deep snow, but it was necessary. A few days later I got stuck in a drift and tried working out of it but the sled was sort of bogging. I came to realize on the next ride that it would drive and move but it would reach a certain point in speed and stay there. Not a rev limiter, but a constant speed where it wouldn't rev any higher. There was also a weird noise coming from the clutch. I changed the belt and plugs but it didn't fix anything. Now the sled idles fine but will not move. Is the clutch spent? Maybe rollers or springs? I am not a mechanic and have a basic understanding of the sled. I am certain its the top clutch, the secondary, that is causing the issue but maybe not. Any help or what to start looking at would be helpful. Thanks

03 f7 idles fine but wont move