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A noisy rear differential in a 1991 Volvo 940 could indicate several issues, such as worn bearings, low fluid levels, or damaged gears. It's important to check the differential fluid for contamination or low levels, as this can lead to increased wear and noise. If the fluid looks dirty or is low, a change may be necessary. If the noise persists after addressing fluid levels, further inspection or professional assistance may be required to diagnose and repair internal components.

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2w ago

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