Your vibration sounds like a B+T problem to me.

I like Charlie's take on a solution.

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Yeah....Im the one who destroyed this rare, vintage automobile.....

He says that he found the problem-a bent rear axle. Look for his post on the 22nd, about the fifth from last on page one.

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50 chrysler,54 Plymouth, 64 Valiant conv 4 speed, 66 Valiant V8 wagon, 70 Challenger R/T 440+6 conv 4 speed,80 Colt, 98 Neon ACR,84 Honda V45 Magna
Taking care of 57 300C conv,48 T&C conv. Missing my 67 GTX and 36 Ply coupe

Nope....Chigato found a bent axle.

Steve has a B+T problem.

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Yeah....Im the one who destroyed this rare, vintage automobile.....