I see there was a service bulletin on the transmission front bushing wear. Things to check were cracked flywheels and worn torque converter pads. I didn't think a automatic car had a flywheel, so I suppose they are talking about the flex plate. Wear in the crankshaft can be a culprit. I did just have the front crank pulley replaced due to a little wobble. Maybe there is some extra vibration in my engine. I presume the pulley has a vibration damper built in as I don't see a separate one. So I will check the converter, crank, alignment pins, and gearbox mounts.
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