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good afternoon my name is ***** ***** I will assist
yes, it does sound like the torque converter is giving you whats called a shutter. it happens when the clutches inside slip and causes this condition. try running again and press the OD button and see if there is no vibration. that will help confirm the issue.
are there any codes in the system???
I see you requested a new pro. shame we just started.
I would suggest before you go off and tear into the torque convertor/transmission, check the rear driveline. Chances are its a simple matter of a universal joint on the way out. They are not a lifetime unit by any means, and, if original are non-greasable