727 vibration

68dodge said
Had a bad vibration in park and in neutral on a rebuilt small block 727. Changed out the convertor to another new rebuilt stock one. Now the car has a vibration, not as bad, but when you drive it, I get a vibration like a consant come and go vibration. Is this transmission rebuild not right'
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When I bought my 340 Duster new, the alternator was out of balance and caused a vibration at around 2,000 rpm. It was so bad that it was breaking the alternator mounting bolts. Also, check the trans-cross member mounting hardware, including the rubber mount.