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      08-13-2020, 02:43 PM   #1
Matthew III
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Differential Whine: Fluid or Bearings?

Hey guys, I believe I have a whine from my differential and the recording is here. Any help to identify the root cause is appreciated.

The prior owner claimed to have changed the diff fluid 15K miles ago and upon inspection the diff fluid was dark so that's not a good sign. Thanks!

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      08-13-2020, 06:22 PM   #2
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That's not diff whine. That squeak is probably diff bearings.
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      08-13-2020, 09:47 PM   #3
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Quote:
Originally Posted by Redd View Post
That's not diff whine. That squeak is probably diff bearings.
ignore the chirping, that was from a clunky exhaust install. it's fixed now, but my concern is the whine you hear in background
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      08-14-2020, 11:32 AM   #4
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That's how my car has sounded since it was new at certain speeds like 40-50mph, especially on coast-down it's always had a little bit of gear whine.

It has 129,000 miles on it now and the diff has never had any problems. The fluid being brown after 15k is normal.
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      08-14-2020, 11:37 AM   #5
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Quote:
Originally Posted by Richbot View Post
That's how my car has sounded since it was new at certain speeds like 40-50mph, especially on coast-down it's always had a little bit of gear whine.

It has 129,000 miles on it now and the diff has never had any problems. The fluid being brown after 15k is normal.
omg this is normal? fuck
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      08-14-2020, 03:53 PM   #6
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Quote:
Originally Posted by MattyRice View Post
Quote:
Originally Posted by Richbot View Post
That's how my car has sounded since it was new at certain speeds like 40-50mph, especially on coast-down it's always had a little bit of gear whine.

It has 129,000 miles on it now and the diff has never had any problems. The fluid being brown after 15k is normal.
omg this is normal? fuck
did the previous owner install stiffer diff bushings than stock? you could try fluid change with the additive I'm it that reduces differential chatter. think BMW makes one with SAF-XJ + FM booster but do your own research to make sure you get the right one.
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      08-14-2020, 06:21 PM   #7
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Originally Posted by akkando View Post
did the previous owner install stiffer diff bushings than stock? you could try fluid change with the additive I'm it that reduces differential chatter. think BMW makes one with SAF-XJ + FM booster but do your own research to make sure you get the right one.
Completely stock. Yeah waiting for the fluid to arrive. Hopefully that solves it. I'm concerned if it's an issue with the gears
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      08-14-2020, 08:07 PM   #8
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Ok I hear it. There is a little bit of diff whine. Check the bushings and see if they were upgraded. Stiffer bushings will cause whine. I would also change the fluid to original fluid and see if that helps.
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      08-17-2020, 01:43 PM   #9
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Update, had another person help me on a separate thread. Need to replace the diff...
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      10-12-2020, 09:57 PM   #10
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Try flushing with motul competition 75w-140 2-3 times every 1000-2000 miles. Mine is dead quiet and locks really well after that.
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      10-14-2020, 02:29 AM   #11
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I replace my LSD bearing in last Sept..... the whining noise from a bad bearing is much much much louder than yours. It was so loud that you can't even chat or listen to radio.
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