300SD Differential Noise

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300SD Differential Noise

05-26-1999, 06:07 PM

mbz486

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I have an 84 300SD with 230K. The vehicle has had increasing differential noise over the past few years. The noise is a whining sound that increases with car speed (RPM), and quiets down when the car is shifted into neutral. The differential is the original, I tried changing the fluid once. Does the differential need replacement/repair? How much does this typically cost to fix?

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