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Old 10-20-2015, 04:14 PM   #226
Dill-Ag13
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Quote:
Originally Posted by hybrid gti 2 View Post
Seriously you can't drain, undo a few bolts and Hamer a pin out. Replace a few bearings and put it back. Save hundreds for like an hour of work. Ok well have fun writing that check. There is no adjustments to do.
If it's only an hour of work I'll gladly pay someone an hour of labor to do it right...
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Old 10-20-2015, 04:16 PM   #227
hybrid gti 2
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They will do a full bearing rebuild and charge $800+
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Old 10-20-2015, 04:21 PM   #228
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Originally Posted by hybrid gti 2 View Post
They will do a full bearing rebuild and charge $800+
Who? The dealership? Parts are $200. Labor, as you said won't be more than a couple of hours.
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Old 10-21-2015, 12:50 PM   #229
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Ok think about this. Your bearings got ground up in the tail housing. It's making noise now, bringing it to your attention that there is a problem. So that metal has to be going some where in your trans. So the shop will tell you. While your here we need to replace all the bearings that were damaged. So your bill just massively grew by hundreds because you didn't find it before other bearings were damaged. You may not hear all the bad bearings. But they were damaged once the other ones started making noise. So the problem with the wrx and sti. The trans is so long. When the torque is put through the tail housing part it tends to flex and put a hard load on those bearings causing bearing flex and damage. It might start off as pitting and crumbles from there. The more torque the more the problem grows.

So if your a reasonable mechanic you might have caught this early. So this thread helps those who are a reasonable mechanic, who caught the problem early. As well have some skill to pull it off. So while this is an easy fix if you have gone to far then your other bearing now have to be replaced. With that being said. This is where things get complicated. As the front t of the trans requires special tools and exact measurements to get this right.

So this might cover trans repairs a. It for those questioning doing this repair. In my case it was a bandaid that gave me another 6 months before the front bearings were finished. So hopefully this will cover many questions people have about trans bearings repairs.

Note if you have a carbon drive shaft this sound will be drastically muffled and you may miss hearing the warning sounds.
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Old 01-04-2016, 04:21 PM   #230
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I'm dealing with this issue on my '06 Legacy GT. I don't think I'd be able to do this myself, and am unsure of how much damage has occurred, so I'm trying to decide what the best course of action would be...

Backstory

Transmission was rebuilt at 86,000 miles 3 years ago (lost 5th gear). Sold to previous owner at 110,000 miles, I purchased at 125,000 miles 6 months ago.

I had the transmission fluid changed at the beginning on December. https://i.imgur.com/Pc3OQja.jpg

A few weeks later, I heard some speed related scraping noises that went away after a few minutes. My first thought was wheel bearing.

On 12/26, I start hearing a whining noise, like a wheel bearing would make. It changes pitch and intensity as wheel speed increases, no changes on acceleration, deceleration, steering, gear change, or neutral. I was hoping it was a wheel bearing, but the fact that it didn't change when steering had me concerned. Here's a video of the noise.

In the following days, the noise would come back after about 10-15 minutes of driving.

Took the car into my shop on 12/31 and had them check it out, the sound is coming from the center differential. On the way there, the noise didn't seem to come back while I was on the thruway, but when I got on the side roads, I could hear it again. The range and pitch of the noise/speed seems to have changed.


Diagnosing

I'm not sure exactly what is causing this noise. My main guess is the rear bearing on the transfer driver gear (output shaft) of the center differential. A lot of the people with center diff noise say that the noise is only during acceleration or deceleration, but that's not what my problem is.


Decision Time

They recommended that I purchase a used transmission and swap it out. Their rationale is that it's highly unlikely that one bearing is the only issue with the transmission, and that doing the service might end up being a waste of money.

I've been doing a bit of research online, and this seems like a somewhat common issue. People are writing up DIY center differential bearing replacement guides.

LegacyGT.com guide

The only used transmission in the area would cost $1,400, free delivery, 30 day warranty (parts only), and has 114,000 miles. Labor would be about $650.
If it's just the center differential bearings, parts would be about $175, labor about $400.
If the differential's viscous coupling is damaged, the cost would end up around $1,100.
To just open the center differential and see what it looks like would be about $250.

I'm leaning towards having the shop open up the differential and proceed from there. If it looks like there are worse problems then just the bearings, I'll purchase the local transmission, or order one with less miles and pay shipping, then have them install it.


Questions

What would you do if you were in my shoes?

With the noise being consistent with the wheel speed, and not changing depending on other factors, would that lead you to believe that it's the differential bearings, or the differential's viscous coupling? I would think if there's noise on load, that it's the viscous coupling, whereas if the noise happens all the time, it's a bearing.
Thanks in advance for any advice you can give!

Last edited by adwinistrator; 01-04-2016 at 04:42 PM.
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Old 01-04-2016, 04:32 PM   #231
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Could also be the transfer gears. Being I don't see chunks on the drain plug makes me think it's something other then the bearing or you caught it super early.
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Old 01-04-2016, 05:51 PM   #232
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how mechanically inclined are you? do you have access to basic tools?

years back i was certain my cdiff/xfer bearings were going out. speed dependent noise, no relation to gear or rpm, not a wheel bearing or cv joint. sounded like it was coming from directly aft of and beneath the shift lever.

bought the replacement bearing set, got the car in the air, removed the tail housing, inspected the transfer gears and...

they were utterly perfect.

so everything got buttoned back up again. then with the car still on jackstands i put it in 5th gear and carefully crawled underneath to listen to where the whine was coming from.

lo and behold it was the snout bearing in the rear diff. just decided to give up the ghost, had done all maintenance over the last decade myself and nothing of note ever.

sourced a rear diff from a guy who went sti for $50 iirc. swapped it in and problem solved. for a **** of a lot less than $2k for a new tranny...
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Old 01-04-2016, 06:34 PM   #233
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If I were you I'd pull the driveshaft out and check the U joints. I had the exact same noise you describe and I ended up changing the bearings out even though they didnt have any visible issues, since I already opened it up and bought the parts but the drive U joints were shot on my driveshaft.
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Old 01-05-2016, 03:58 PM   #234
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I was having a similar problem for a while, it was driving me crazy. I recently replaced my U joints and for now it seems to have solved the problem.
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Old 01-09-2016, 08:37 AM   #235
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Default Help with Center Diff Transfer Drive Gear Bearing R&R

Quote:
Originally Posted by ride5000 View Post

lo and behold it was the snout bearing in the rear diff.


That would be called the pinion shaft bearing my friend. Just for those who would prefer to repair the part rather then replace it with the risk of getting another failure.
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Old 01-09-2016, 09:49 AM   #236
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That would be called the pinion shaft bearing my friend. Just for those who would prefer to repair the part rather then replace it with the risk of getting another failure.
lol

I guess when you "repair" things they never fail again?

that 50 bucks was some of the best money i've ever spent, my friend.
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Old 01-09-2016, 04:07 PM   #237
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Quote:
Originally Posted by ride5000 View Post
lol

I guess when you "repair" things they never fail again?

that 50 bucks was some of the best money i've ever spent, my friend.

I'm just giving you isht like you do to me lol just in a more logical way
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Old 01-20-2016, 08:22 PM   #238
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Finally got around to pulling the tail shaft off my 2004 6mt, and replaced the 4 bearings I could get to.

Its winter storming out, and traffic was creeping along at 20 MPH, so I couldn't really get a good test run. at least it still shifts haha.

It was all pretty straight forward, except for those two 1/2 needle/roller bearings that sit on the center diffs shaft-UGH-what a pain sliding the tail shaft back on with those things popping off every time. Finally it just popped on, wonder if they just fell off-hope not.

I don't ever want to do that again, just because of those two 1/2 bearings… 9 hours total.
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Old 01-20-2016, 10:10 PM   #239
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Use a tacky assembly lube like Lucas they'll stay in place better.
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Old 01-21-2016, 07:05 AM   #240
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Quote:
Originally Posted by spoolinsti05 View Post
Use a tacky assembly lube like Lucas they'll stay in place better.
I was thinking that would be the way to go. I used some grease I had handy(i found my assembly lube while putting everything away afterwards, figures), but it mixed with the tranny fluid that was still in the area(I put some on the bearings before install) and lost its "stickiness". I cleaned it all back off and it did seem to stick better then.

Drove it around a bit more on the highway. I had a bearing noise/growl on deceleration with any level of center diff lock. It appears to be gone now
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Old 02-21-2016, 12:20 PM   #241
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Default Here we go again

I had this issue just about exactly two years ago @100k miles, fixed it, and now @120k miles, the whining is back.

I think I noticed a pattern in what has accelerated the wear, based on the timing of both times the whining started. Has anybody else picked up on a pattern or know the root cause?
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Old 02-21-2016, 12:53 PM   #242
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Root of the problem is 3 things. 1, to much power going through it. 2, you have metal shavings in the trans still. Or 3 you did something to the bearings when installing.
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Old 02-21-2016, 11:11 PM   #243
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Quote:
Originally Posted by hybrid gti 2 View Post
Root of the problem is 3 things. 1, to much power going through it. 2, you have metal shavings in the trans still. Or 3 you did something to the bearings when installing.
It's certainly not too much power, my car is a stock '07 2.5i....at high elevation.

Incorrect installation is certainly a possibility, but I took my time to do it to the best of my skill. The design is known to do this, so there's likely to be something other than (or in addition to) a mistake of mine at play.

The pattern I noticed is cold weather. A couple years ago, my driving patterns changed to include parking outside, and my drive home from work includes an interstate entrance ramp about 100 feet from my office. The whine is worst when transmission is cold, so it seems either as the parts expand, or as the oil thins and reaches the back of the trans easier, the noise reduces. I'm wondering if anybody else has noticed a similar trend.
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Old 04-12-2016, 11:25 PM   #244
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I'm getting ready to replace my bearings for the second time and want to verify the shim thickness needed. Last time, whatever was in there from the factory went back in there.

Does anybody know what to measure and what the spec is supposed to be to determine shim thickness?
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Old 04-17-2016, 01:06 AM   #245
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Quote:
Originally Posted by mtg View Post
I'm getting ready to replace my bearings for the second time and want to verify the shim thickness needed. Last time, whatever was in there from the factory went back in there.

Does anybody know what to measure and what the spec is supposed to be to determine shim thickness?
Anybody?
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Old 05-07-2016, 11:13 AM   #246
hybrid gti 2
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Never noticed shims on my 02. But just do it the same way it was before.
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Old 05-11-2016, 04:24 PM   #247
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Anybody?
it's detailed in the FSM.
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Old 10-22-2017, 01:35 PM   #248
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im about to do this in the next week or so. my wrxy sounds like a diesel ford with single mass flywheel when i let off the gas.

i have a download of the FSM for 2005 (my year car). the shim formula for the tapered roller bearings seems to create some interference which actually makes sense. you subtract distances giving the actual clearance, then it says ADD .2 to .3 mm which gives you a shim thicker than the space measured. but people in this thread are saying you need some play? i have never seen any tapered roller bearing system that had any play in it unless it was shot. they usually (always) have preload. so what is the correct thing here?
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Old 11-29-2017, 08:29 AM   #249
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Just Read through this thread. I am rebuilding my 5MT right now and am doing the transfer gear bearings as a preventative maintenance since I am in there replacing the center diff and 5th gear needle bearing in input shaft bearing.

My symptoms where car hoping and binding when warmed up (center diff) and a rattling bearing noise at a stand still that would go away when the clutch is disengaged. My throwout and pilot bearings are fine, and they would only make noise when the clutch is disengaged anyway, my problem was the opposite.

My question is:

How do people get the transfer gear (driven) bearing races out of their housings (ext. case and cover), they are a blind hole. Is warming the case enough? special puller? Cut it out?

Thanks!
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Old 11-29-2017, 08:54 AM   #250
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I think mine just jiggled out. Maybe tap the back with a rubber mallet a bit.
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