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Old 12-16-2000, 09:25 PM
Jim Barnhart
Posts: n/a
We just purchased a 1979 300SD with 224,000 miles. The rear end had a loud clunk noise. We had a Mercedes mechanic check the rear end and he said that was fine for the amount of miles. When you accelerate between 50 & 60 mph you get a loud humming noise from the rear end. This only happens on ocassion.

Thanks for your help.

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Old 12-16-2000, 09:47 PM
Registered User
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
You are generally describing what sounds like excessive clearance between the ring and pinion gear. The clunk is usually a dead giveaway. Humming could be a bearing, but most likely it's the ring and pinion clearance. This will need some attention soon.

Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.
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