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I have a 2019 Performance Pack 2 Mustang GT. There is a low whine (not noticeable if radio on) @ 40-55 mph and it gets real noticeable at 68-72 mph. Took to local dealer and they said this is normal for the 3:73 rear end. I had a 71 super cobra jet with 4:10 locker that did not whine at all...