I was out bashing today and mid way through the second tank the truck became sluggish to run. It was running like a champ the first tank and a half. When it became sluggish, I checked temps and they were high (280-300 previuosly 240ish). They truck idles fine and will rev up to 30% throttle without moving. Higher revs and it stalls out. The drivetrain does not bind, all wheels spin freely from spur gear to tires. Is the clutch shot? :\