I have an 06 grand Cherokee wk with 130xxx miles. It recently started making a whining sound so I had a dealer add 2 qts of atf4. They said I need a new transmission since the whining is still there. I recently watched your how torque converter works video and it made me think it could be the oil pump whining. When I turn the jeep off I can hear the winning stop in sync with motor.
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