Quote Originally Posted by DavidM View Post
Edit: ACT has the heavy duty PP and a sprung and unspring 6-puck disc. I see how using the sprung would reduce vibrations, but the springs seem like they could be a failure point. I've had the unsprung in the car and the tranny doesn't seem any worse for wear, but maybe symptoms just haven't shown up yet. Earl, is your disc sprung or unsprung?
Mine is the solid 4-puck disc. It's a little rough to drive around the paddock, but once on track you can't tell the difference between it and a stock clutch - except for the no slipping part. The trans is a 100k+ mile one I replaced in '06 (before the new clutch), and it's still working fine. I wouldn't hesitate to put the same clutch back in next time.