What are the chances of my stock flywheel being cracked? I have had problems with a vibration (sitting still, clutch in or out) that seems to be worse at idle or below (just getting going) or just at or around 2k rpms. I changed my clutch/pressure plate last august and had the stock flywheel resurfaced (160k miles on it). I know there's a chance it's motor related (even though it still seems to run smooth as ever with good gas mileage) but I have a feeling it might be flywheel/pressure plate related.

Anybody heard of hairline cracks in the flywheel that cause it to be unbalanced? or something similar?

Thanks for any help,
Kyle

Also, we took the belt off and ran it and it's still there. It's possible it's the balancer, but it spins normal and seems to look fine.