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I tried to explain, but basically the issues that would cause this are mostly eliminated in that unit. It may sound dumb but it could be a matter of rpm and could be something as simple as a puley or bearing in one of the components on the front of the motor. I had an alternator make a terrible vibration between 2200 and 2500 rpms. When the converter is locked the drivetrain may be absorbing it. Does it do it sitting still?
Alan
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