I had the same problem at one point, she would vibrate at excessive speeds, in or out of gear. Beleive it or not, my clutch was at fault. I swore that my tranny was going to go flying too. My clutch eneded up being extremley worn even though she caught low to the floor. As soon as I replaced it, everything went away and she was back to normal. I assume you have a stick because you metioned a flywheel instead of a flex plate. I hope this helps a little.
Good Luck,
Christina
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