Noise on decel

Hi I have a 2011 mustang gt and have a whining noise from the rear on decel

Factory gears? Sounds like possibly a bad pattern on the gear set


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Becoming more n more common to see original fill diff / trans fluids turn to poop long before it's time. Stock gears / has it had fluid change?

Confused by rearend noises... man are we ever an old bunch lol