From the description I would swear they are talking about the flex plate. The Flex plate is the automatic transmission equivelent of a flywheel and attaches the torque converter to the crankshaft. It also has the teeth for the starter to turn against. I think the reason they are not called flywheels is that they don't have the mass of a flywheel, but that is just a guess. Not sure what to say about their diagonosis? I have heard the flex plate can become cracked and I suppose that could be the problem.
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