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differential noise

Adam h

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Adam
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2020 mustang gt
having a humming noise coming from rear of the car most noticeably at around 50-65 mph while lightly on gas, any ideas on what it could be?

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Cobra Jet

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Rear diff pinion bearing is most common for making that type of noise and it is more present when the vehicle is under load.

If you’re driving and you take your foot off the gas in the range you’re feeling/hearing it - does the noise subside? Will it also subside at lower speed/rpm, then become present as soon as you hit a certain speed/rpm?

If the answer is yes to both above it’s usually the pinion bearing.

If it were a wheel hub, usually the noise gets louder as the car leans into the side with the bad hub or the noise will always be present and won’t “adjust” to speed/rpm.
 
 








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