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vibration

Engine

Model: 944 Turbo, Year:1987, Mileage:79000, Type of use:Street use only
I have a 87 944T. I have developed a drive train vibration around 3500 rpm. It is strongest at around 4000 rpm but then goes away. I have replaced the motor mounts (they appeared flat but did not fix) and have performed a visual on the cat converter. The honeycomb looks fine. I can not find a shield causing a vibration. Any ideas?

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