Sounds like the gears aren't set up properly. My guess is pinion depth. I'd put it up on a lift or jackstands and run it up to speed to isolate the noise.(Be careful) The beauty of a 9" is the ease of pulling the gear set and setting it up on the bench. Once you isolate the noise to the pumpkin, I'd take it to a reputable gear shop and have them check it. You should be able to see the wear pattern clearly with 6k.
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Todd
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