It sounds like the transmission torque converter has gone bad. which I would now replace the transmission because there is metal inside. This video shows how the job is done on a similar car the process is the same with diagrams below to show you on your car. Disconnect the battery first.
Check out the diagrams (below). Please let us know what happens.
Images (Click to enlarge)
Tuesday, July 2nd, 2019 AT 4:03 PM