Hi,
It could be related to the torque converter which is right behind the engine in the transmission bell housing.
Don't laugh, but if you can, pick up an automotive stethoscope. Most parts stores have them for around five dollars. Use that to see if you can locate the source. Check the bell housing area to see if that is where it is loudest.
Let me know.
Joe
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Wednesday, May 17th, 2023 AT 8:16 PM