My experience with Centerforce DF clutch is very harsh engagement, very hard on the driveline parts, and will break parts at high rpm launches with bias slicks. The cure was to take out the DF disc and put in a rag disc (organic disc for those who don't know the rag disc term) to get rid of the hard hit and soften up the hit upon engagement. A little slip in the clutch goes a long way to quicker ETs and saving the driveline.
