I'm replacing the clutch in my '97 K2500. Anybody know the minimum thickness of the flywheel for the 6.5TD? It's not stamped on it like other flywheels I've seen. It's been resurfaced 2 times already, very minimal though. Truck has 180k on it, the d@mn internal slave cylinder blew out, AGAIN! I hate that design. Looks simple on paper, but sucks in reality. CLutch disc looks great, only has 70k on it. Aside from being soaked in brake fluid from the slave. Anyhow, min. thickness on the flywheel?