Problem while starting my 1997 GMC Jimmy?

[thewisdombank]

I have a 1997 gmc jimmy. I had a problem when starting it. When I started it, it made a really bad grinding noise and seemed as if a tooth or some teeth on the flywheel broke off. Is this a common issue, or is there something else wrong with it that would cause it to do something similar to what it is doing? Right now, im thinkin that it needs a new flywheel from the way that it sounds when starting. It makes a loud clack noise and shackes violentely.