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Old 03-20-2016, 06:04 PM   #1
jhersey
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2004 STI
Aspen White

Default High pitch sound from Rear Diff at 60mph

I'm in need of some tech help. I drive an 04' STi Sedan. I've only owned the car for about a year, and the entire time I've had it, I have heard a high pitch "whining" sound from my driver's rear side, possibly by the rear diff. The tires that came with the car were awful. They were stretched over the rims badly, and the rear left tire I'm guessing popped at some point and they replaced it with a different kind of tire than the other 3... I figured this was the cause of the noise so I saved up and bought some nice Continental Tires that fit over my 18's correctly but the noise still continued. I then thought maybe the rear diff fluid hasn't been changed in a long time or maybe they used the wrong fluid so I ended up changing that and that still didn't kill the noise. So I'm hoping for some help here.

The noise is from the rear driver side. I really only hear it on the highway. It is loudest right around 60mph, but I can hear it from about 50-75mph. The only time I can really hear it is when I'm maintaining my speed. Once I put on the gas it goes away. If I put in the clutch it goes away. If I just coast without my foot on the gas it goes away. I thought it completely went away when it rained, but I still do notice it, but it's not nearly as loud.

I'm guessing it could be a bearing from the diff. My rear struts are also awful which I plan on replacing next month, so I'm not sure if that plays a part. It doesn't matter what gear I'm in I can hear it, but it's pretty specific at 62mph. I've searched on NASOIC and haven't found anything similar. Lots of people with noise from the side mirror though...

So please I'm all ears for what this could be!!! Thanks!!!
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Old 03-20-2016, 07:24 PM   #2
phoebe bloom
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Video of the noise?
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Old 03-20-2016, 07:41 PM   #3
jhersey
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Quote:
Originally Posted by phoebe bloom View Post
Video of the noise?
I can try and record it tonight or tomorrow... but the sad truth is I don't know how to post it on this thread...
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Old 03-23-2016, 05:07 PM   #4
jhersey
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I'm going to attempt to post a youtube link of the noise I'm having. I've noticed that I think it's a little louder while in 6th gear, and it seems to slowly and gradually be more common from 50pm up to now 80mph when it normal held around 60mph. Still no idea what it could be, will research more for a weekend attempt at fixing it...

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Old 03-23-2016, 05:09 PM   #5
jhersey
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Old 03-25-2016, 08:08 PM   #6
jhersey
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Nothing? Even with the video? should I post this in the newb section lol
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Old 03-29-2016, 05:39 PM   #7
slide
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Id start at the carrier bearing and make sure all the bolts to the body are tight. Then make my way back. Drive shaft, everything. Including the diff housing carrier.
Then I would check to make sure their is fluid in the diff.

Then I would take a look at the half shafts and boots, the. Make sure the wheel bearings are t on their way out.

You will find something loose, torn, empty or loose...(yep I said that twice)
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Old 03-30-2016, 09:59 PM   #8
jhersey
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Quote:
Originally Posted by slide View Post
Id start at the carrier bearing and make sure all the bolts to the body are tight. Then make my way back. Drive shaft, everything. Including the diff housing carrier.
Then I would check to make sure their is fluid in the diff.

Then I would take a look at the half shafts and boots, the. Make sure the wheel bearings are t on their way out.

You will find something loose, torn, empty or loose...(yep I said that twice)
Thanks! I'll go down the list of possibilities. The only one I know it isn't is the fluid in the diff, outside of that I have a lot of things to check. It doesn't seem like it's gotten worse or better, and it's still pretty intermittent... drove to work today and barely heard it but a couple days ago driving hope it was louder than the video... I'll shoot in the dark this weekend and I'll post if I find anything and if I don't
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Old 04-09-2016, 11:55 AM   #9
phoebe bloom
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Any updates? Seem to have the exact same problem
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Old 04-13-2016, 11:12 PM   #10
jhersey
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Nothing new. No new noises, vibrations, sounds or anything like that. Only have had time to do a quick visual check on the real diff and axle. I have the day off tomorrow and I plan on going more in depth and will post a follow up with what I find.

I've searched more online and within my local chapter of subaru owners with very little luck...
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Old 04-13-2016, 11:20 PM   #11
jhersey
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I'm afraid though that it might be a rear wheel bearing going out...
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Old 04-14-2016, 02:22 PM   #12
FierceWRX
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the fact that the noise went away in the rain tells me its not in the diff. i would think wheel bearing or propshaft hangar.
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Old 04-16-2016, 05:46 PM   #13
jhersey
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Quote:
Originally Posted by FierceWRX View Post
the fact that the noise went away in the rain tells me its not in the diff. i would think wheel bearing or propshaft hangar.
Propshaft hanger is something I haven't looked in to... and makes a lot of sense.

It rained recently and it still made the high pitched noise... what's weird is it really is only at specific speeds, I've found right at 62mph and 71mph are significantly different. I can cruise at 66mph with no noise.

I tightened a few things down, and rotated my tires, checked my rear diff fluid level so I'll post if it changed anything, will know by tomorrow. And I'll take a closer look at the wheel bearings and propshaft soon... I'm leaning towards these as the culprit...
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Old 04-17-2016, 03:04 PM   #14
sWagonRX
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What you're describing sounds similar to a TSB Subaru released awhile back for complaints of a harmonic "hoo" sound at cruising speeds and deceleration from 65MPH, give or take. I know that was for certain WRX sedans and wagons, but not sure if it applies to an STi...never hurts to check it out though. What Subaru does to fix the noise is add some dynamic dampers to the rear differential member. Here is a link that might be helpful:

http://www.bescaredracing.com/sti/ts...area_noise.pdf
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Old 04-19-2016, 04:02 PM   #15
jhersey
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Quote:
Originally Posted by sWagonRX View Post
What you're describing sounds similar to a TSB Subaru released awhile back for complaints of a harmonic "hoo" sound at cruising speeds and deceleration from 65MPH, give or take. I know that was for certain WRX sedans and wagons, but not sure if it applies to an STi...never hurts to check it out though. What Subaru does to fix the noise is add some dynamic dampers to the rear differential member. Here is a link that might be helpful:

http://www.bescaredracing.com/sti/ts...area_noise.pdf
Wow that is almost exactly what I've been experiencing!!! Thank you so much, I'll definitely check this out.
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Old 04-22-2016, 08:03 PM   #16
sWagonRX
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Quote:
Originally Posted by jhersey View Post
Wow that is almost exactly what I've been experiencing!!! Thank you so much, I'll definitely check this out.
No worries. Hopefully this is the fix!
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