Rear differential noise

NOAH956

MEMBER
2015 FORD MUSTANG
V6
AUTOMATIC
47,461 MILES

I took my car to get serviced at the CarMax dealer due to a rubbing/grinding noise when turning. The technician diagnosed the problem/noise coming from the rear differential after going on a test drive. The technician stated when the fluid gets dirty and doesn’t get changed the differential will make that noise. Well they told me they will drain and fill the rear differential fluid and add friction modifier. It’s been 6 days since and the noise still sounds about the same. Should I be concerned or should I just keep waiting until the fluid soaks into the gears?

Monday, January 13th, 2020 AT 9:24 PM

3 Replies

ASEMASTER6371

MECHANIC
52,796 POSTS

Good morning,

The fact is the fluid needs to be changed at 100,000.

Once the noise starts, changing fluid will not stop the noise. Whatever is causing the noise did not get better by the change. They need to open the differential and determine the bearing failure and repair as needed.

Noises on turns usually are from the axle bearings on the outside ends at the wheels. That will be the first place to have checked.

Roy

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Tuesday, January 14th, 2020 AT 3:12 AM

NOAH956

MEMBER
24 POSTS

I set up another appointment at CarMax to get my car looked at on the 27th because the noise is still apparent. The noise is more obvious when the vehicle is cold and when you turn the wheel and press the gas lightly. The sound also sounds like it’s coming from the front end of the car.

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Friday, January 24th, 2020 AT 6:43 PM

ASEMASTER6371