Reading this thread has scared me a little. It's odd that such a powerful engine would be subjected to a condition only seen in weaker engines so easily. Any luck on finding ways to cure crankwalk other than disabling the clutch switch? I know of 2JZ engines that rev up to 10k and have never had problems. Must be the way you build your engine, I guess. It seems stock shortblocks have more of a tendency to crankwalk than modified ones? I dunno... just speculating.