Hi,
Update: If you look below, I indicated my thoughts but wanted the site's owner's opinion. The first thing he said was the front pump. He did add a couple other possibilities, but they all require the transmission to be removed and likely overhauled. I wish I could provide better news, but we both thought the same thing.
If you wanted to check line pressure (as provided below) that would be conformation, but that is your call.
Listening to it, I suspect it is related to the front pump in the transmission. Were you able to perform the diagnostics attached above? Also, I am going to attach directions below for testing line pressure. If it is low, the transmission will need to be removed and inspected.
Also, I am going to ask the site owner to listen to it and see what his thoughts are.
Take a look through the line pressure testing procedures below and let me know if you are comfortable performing them.
Take care,
Joe
See pics below.
Images (Click to make bigger)
Wednesday, April 5th, 2023 AT 6:45 PM