Acura Repair Questions? Ask a Mechanic for Answers ASAP
Have you changed the oil in the rear differential lately? and if so did you use the Acura VTM-4 fluid? If not try this first the fluid breaks down and causes the rear diff to grind when turning . Also using any fluid other than VTM-4 fluid can cause the differential to make noise.
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Check that the backing plates are not rusted or touching the rotor. But 99% of the time when these grind when turning the diff fluid is the cause.