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  #1  
Old 07-30-2010, 03:33 PM
JamesDean's Avatar
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Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
w201 differential whine

Hello everyone,

I was just wondering your thoughts on a whine I have in my rear diff. I did some reading and some people say using a heavier oil might help quiet it down. Right now I have 85w90 or 75w90 I can't remember. Some of the threads I saw seems to indicate using 85w140 would help quiet it down a bit.

Thoughts?

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  #2  
Old 07-31-2010, 11:25 PM
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Join Date: May 2010
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I've heard oil can help..redline makes one. from my experience whine is usually from the pinion setting in the differential. It won't harm you but annoying. I assume you have serviced the diff oil.? You could replace the rubber differential mounting. I think there was a lot of sound deadening behind the back seat, you might check that too. Are you sure it's a differential noise? Not in the axle or brakes? Noise can transfer.
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  #3  
Old 07-31-2010, 11:34 PM
JamesDean's Avatar
Electrical Engineer
 
Join Date: Apr 2005
Location: NE Ohio
Posts: 5,034
The diff has fluid was changed out at 190k. Its only on decel/coast. Nothing on accel.

So that makes me think differential. I can't remember I put in it...
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

82 300SD 145k
82 300SD 265k
87 420SEL 230k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k
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  #4  
Old 08-01-2010, 12:01 AM
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Join Date: May 2010
Posts: 25
Quote:
Originally Posted by JamesDean View Post
The diff has fluid was changed out at 190k. Its only on decel/coast. Nothing on accel.

So that makes me think differential. I can't remember I put in it...
if it's on decel/coast then that's the gear noise. like i said noise is transfered so changing the mount might help, and also check the rear seat isolation first.

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