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Old 05-05-2013, 12:27 AM   #26
willg
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With my car, an 08 WRX, I had a bad rear wheel bearing. I thought it was the tire, because it was only making a loud humming from 40-60. I got the car into the air, and rotated the wheel and could hear the bearing making noise. There wasn't any play in the wheel, and when driving it was very hard for me to establish where the noise was coming from.

I was pretty surprised that the wheel bearing was bad. I also thought it might be the rear diff, but having someone listen to where the noise is coming from in the car while at speed targeted it to the rear wheel. Like you said, on other cars I've had it usually gets louder with speed or clunks, but with the subie it was a loud humming that sounded like a bad tire.
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Old 05-05-2013, 02:14 AM   #27
salvi
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If that's the case, it might be just a bad wheel bearing making the new noise. I'm starting to drop the transmission to check and fix the hopefully just bad center diff bearings and install an oem clutch since the current one is chattering like crazy.

Thanks for the info.
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Old 05-05-2013, 02:44 AM   #28
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Yeah, I would check the bearings by rotating the wheel and listening, potentially with a stethoscope.
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Old 05-05-2013, 12:42 PM   #29
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The noise on the car has gotten louder and now I'm hearing a humming noise that seems to be coming from the passenger front side. The noise only starts at 40 mph and stops at 50 mph. It only happens when you are accelerating, doesn't happen in neutral or when you are not on the gas. It happens in all gears though.

Any clue on what it could be? I'm planning to start dropping the tranny today and see what I find inside. Wondering if it's even worth it trying to fix it or to just get a replacement.

Noise during acceleration could be the front diff pinion bearing, could be it's quiet until 40 and at 50 the road noise overwhelms it.

A vid of my really bad front diff bearing:

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Old 05-05-2013, 03:36 PM   #30
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That video is not the noise that mine is making. That video sounds like a scratching noise, where mine is just a humming noise. It literally just appears at 40 and goes away at 50.
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Old 05-05-2013, 03:50 PM   #31
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Did you have a chance to check the wheel bearings? What you are describing sounds exactly like the issue my car had
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Old 05-05-2013, 04:10 PM   #32
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Got the car in the garage last night, I'll check it today. U do describe exactly what I'm having. Maybe it's just a coincidence that the bearing started going bad at the same time that the tranny is making that noise.
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Old 05-05-2013, 10:18 PM   #33
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Yeah, I had the same problem. The center diff bearings went, and I fixed those, only to hear a new noise 1000 miles later. I figured it was something with the transmission and troubleshooted problems with that only to later discover it was a wheel bearing.

For what it's worth, I thought the humming was coming from the front/center of the car when in the driver's seat.

Also my car had around 110k miles when all this happened.
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Old 05-05-2013, 10:26 PM   #34
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Sounds just like what I'm having. The new humming noise is coming from the front/right side.
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Old 05-05-2013, 10:40 PM   #35
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Im not sure about the fronts, but on the 08+ wrxs, the rear wheel bearing is around $110 from the dealer (was cheaper than any auto parts store), but was essentially impossible to remove from the knuckle. Its like an entire hub assembly thats pressed, and mine was rusted too. If I did it again I would have bought a new knuckle from a junkyard. It may be $50 more expensive, but 100% worth it. I had to pay a shop an hours labor to remove the old hub from the knuckle it was so badly stuck.

PM me if you have any other questions/want some tips about that or the diff bearings.
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Old 05-07-2013, 03:59 AM   #36
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Got the car on all four jack stands tonight. Turned the wheel and didnt hear any bearing noise, only the noise of the brakes dragging. Drained the tranny oil, plug had minimal tiny debree. Should be able to start dropping the tranny tomorrow.
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Old 05-12-2013, 05:39 PM   #37
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it helps to get it up on a hoist and try to reproduce the noise..using some electronic ears..to see if its transmission related. I always keep extra sets of transfer bearings on hand when racing..have a full set with gears pop em in and go in the classified.
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Old 05-14-2013, 03:58 PM   #38
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Quote:
it helps to get it up on a hoist and try to reproduce the noise..using some electronic ears..to see if its transmission related. I always keep extra sets of transfer bearings on hand when racing..have a full set with gears pop em in and go in the classified.
I have the extension apart and have taken off most of the bearings. I'm getting ready to order the new bearings, but just have a question in regards the washers. From the schematic, it shows a total of three washers. One is behind one of the bearing's race, the other on the shaft that goes into the center diff, and the last one behind the bearing that is held in by four allen bolts.

When I took off the shaft with the bearing that has the four allen bolts, I did not see a washer. I don't see it anywhere. Can anyone confirm that this is not needed? If it is, what size washer should I purchase?

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Old 05-14-2013, 04:19 PM   #39
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I have had the whining noise just like in the first Youtube video for almost 3 full years now. Sounds like it is coming from the center diff area. My problem is that I have an 04 STI 6-speed in my 02WRX. Does anyone have the procedure for doing these bearings for the 6-speed?
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Old 05-14-2013, 04:21 PM   #40
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I would assume that it's the same since it should have the same extension as well.
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Old 05-15-2013, 04:58 PM   #41
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So the manual says that behind that bearing it's not a washer but a snap ring. So I'm guessing that there is no washer just that snap ring.

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Old 05-28-2013, 12:10 AM   #42
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I'm going to bring this one back to life...I replaced all my center diff bearings yesterday with a clutch job, and the two taper bearings were slightly different. They both had a thicker bearing race, and a smaller roller diameter. Anyone else experience this? Everything went together without a hitch, and it's running quieter than ever...
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Old 06-01-2013, 03:23 PM   #43
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Yeah, I'm actually in the process of doing the work. So far I've got the two bigger bearings done. The new bearings are different as you stated. The bearing race is much thicker.

How did you remove the old bearing races?
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Old 06-01-2013, 03:51 PM   #44
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Just pulled off both races. The one that is on the extension piece, it has a nice hole on one side that you can hit it with a long punch and it will just pop out easily. There was a washer behind that race as well.

For the race that is on the transmission side, it has a hole that you can use long needle nose pliers to grab it and pull it out. It came really easy.
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Old 06-02-2013, 04:23 PM   #45
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Just finished the job today. Installed a new OEM clutch as well. Noise is gone as well as the whining noise that appeared at certain speeds before.

Only thing I hear is kind of a hissiing sound when the clutch is engaged, maybe the clutch just to break in?
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Old 06-08-2013, 05:17 PM   #46
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i have the same hum or howling sound at 40-50mph on the throttle , any faster or slower it goes away . just got this car it is a 04 fxt iwith 150k miles originally i thougt it was a wheel bearing but they all feel ok .i did notice that the front wheels are much more easy to spin than the rear
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Old 06-09-2013, 11:02 PM   #47
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That's most likely because of the rear E brake shoes???
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Old 06-09-2013, 11:18 PM   #48
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That's most likely because of the rear E brake shoes???
It could be but the e brake hardly works , did the center diff bearing fix the noise yours made?
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Old 06-10-2013, 12:15 PM   #49
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Yep, it fixed every noise I had.
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Old 06-24-2013, 09:22 PM   #50
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I have this same issue I just don't know what part #'s for my 04 Sti. I want all the bearings & necessary seals.
It's had a humm/whine since I've had it but just a couple days ago it got progressively worse & has a nasty grinding noise to it. At stops I can feel something g wobble & bang around until I'm over 2mph.
I originally thought it was the transmission mount and driveshaft bushings but now I think it's 1 of the bearings in the transfer case. I'll tear it open as soon as I find out what I need to order.
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