TripleFlipOut

I have an older Kyosho USA-1 Nitro Crusher with an O.S. .21, everything is stock on it. I was having a ball with it in the snow that fell just last week, but my clutch let go after only one tank. I bought the truck used like this, so for all I know it's the original clutch. What upgrade clutch would anyone recommend? Can I just purchase a 1/8 Kyosho buggy clutch kit with 3 shoe flywheel, etc? Is there a 2-speed available for this truck, or has anyone attempted to modify? I would rather go to 2-speed if possible while I'm buying parts for it.

Thanks very much,

Wes