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do you have a poly trans mount and rubber engine mounts? If so, change the poly mount to a rubber one.
t56 trans' are very sensitive to output shaft harmonics, and in some cases have problems with looseness in the 5-6 cluster extension(should be pressed on and off, sometimes they are not that tight and cause weird vibrations)
my brother had a weird resonance/vibration occurring in his car due to the mismatched engine mounts. once we put the rubber mount in the car, the vibrations went away.
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