Whirring sound when decelerating

2013 SUBARU OUTBACK
104,000 MILES • 4WD • AUTOMATIC
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WALKERMCBAIN
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  • 2 POSTS
When I let off the gas or touch the brake a whiring sound begins and sounds like it is winding down. The sound stops when I push the gas again.

What is this?
Nov 8, 2020 at 6:06 AM
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KASEKENNY
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 18,907 POSTS
More then likely this a gear or a bearing in the drivetrain. When you accelerate you are taking the slack out of the gears so it stops making the noise.

Here is a guide that will help with this. You will want to focus on the differential noise in this guide.

https://www.2carpros.com/articles/whirring-sound

Let's run through this and go from there. Thanks
Nov 8, 2020 at 6:35 AM
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WALKERMCBAIN
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I was told when I got my oil changed last week that I should get my differential fluid changed as well. Would this solve the problem? Or is it a bigger issue?
Nov 8, 2020 at 7:47 AM
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KASEKENNY
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I can't tell you if it will solve the problem or not because if the damage is already done then the new fluid will not stop the noise. However, I would definitely do it because it can't hurt.

Here is the process from the manual.
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Nov 8, 2020 at 1:55 PM