There is a clucth on the end of your crank and one on your gear box, the belt runs in the clutches that in turn turns the gear box/transmission input shaft. The input shaft turns gears inside the gearbox, the gears are joined with a chain. I am assuming the new transmissions are still chain driven inside, someine chime in if I'm wrong, I just got back into an rzr, my last one was a 09 s turbo.