Will it shut off in neutral? If not it sounds like you have a torque converter clutch that has fallen apart which means the transmission will need to be removed and the converter replaced. To be sure please make a short video using your phone and upload it in your response so I can tell for sure. Here is a video of what need to be done:
https://youtu.be/3vJAojsrfuU
Please run down this video and report back.
Cheers, Ken
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Monday, August 6th, 2018 AT 3:04 PM