Blue Gear
James,
That sounds like the only thing it could be. Maybe the nuts just loosened up, or the flex plate cracked. The flywheel/flex plate is about 14" in diameter and located between the engine and the transmission. You can only see it through an access hole on the top of the bell housing a little to the passenger side. This hole is usually covered up with a black rubber plug. (2 1/2 " wide X 1 1/2" tall)
Tom
P.S. Feel free to call me on my cell phone (301) 707-3437.
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