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The high pitch humming noise is usually caused by the pre-load not within spec. If plan on keeping your Mercedes, you will be money ahead if you paid for the dealer to check your differential to see if it needs adjusting. It is far cheaper than replacing the differential. If you purchased your car at the dealer they might give you a discount - it doesn't cost anything to ask.
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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles
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