Boy, I'd be surprized if a flywheel just came loose from the crankshaft. I'll bet that vibration is from a CV joint or something. Taht would also explain the drive train looseness. A loose flywheel would NOT cause drive train sloppiness.
If it's an ordinary vibration or a rumble, then I'd say it's a CV joint. The vibration from a poorly balanced flywheel would be a BUZZZZZ. Like a, you know, one of those things that vibrates.
Anyway, the flywheel bolts to the crankshaft with nine bolts I believe. and it would make quite a mess if they let go of the flywheel or if it got loose. Sorry, I don't believe your flywheel is loose.
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'83 SC
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