Or it could be.........driver error...? I bet not since you seem to know your shit lol. This is a sumper though, but check your adjustment. Have you checked to see if the imput shaft wiggles? On the one josh and me pulled form my car, that whole shaft shaked lie a bitch with your hand, wonder if it can be putting pressure on it when stoping, going, cornering, and just causing to much stress on the clutch.