Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
Can you describe the noise?
Unfortunately you are seeing the result now, damage internally to the clutches and bands that will now require overhauling to address.
We just need to find the cause so that is addressed as well. The most common causes for noise concerns that are related to the symptoms your having are:
Pump gear failure
Broken valve springs in the valve body and binding valves
Broken gear set.
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