I had a bad vibration after an t56 swap I did in my 67. I checked everything.....drive line angle, drive shaft, wheels, everything. I was using solid body mounts, with an 8pt cage, and a brand new performance trans mount. for some reason all that acted like a big tuning fork and once i swapped out the hard trans mount for a "stock replacement" my vibration went away. Not even a hint in the shifter. Its a pain but you'll get it. good luck.
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