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Old 12-25-2017, 09:35 PM   #26
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Member#: 220971
Join Date: Aug 2009
Chapter/Region: South East
Location: NC
2004 Impreza


Kinda looks like the spider gear shim washers, and the color of the fluid on them looks as bad. Likely the diff is done.
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Old 01-05-2018, 05:23 AM   #27
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Join Date: Oct 2014
2003 wrx stage 2


Yep, those go behind the spider gears, I found the same thing on a 6mt I bought to swap in. Bummer..

On the subject of clunking when warmed up, my problem is persisting after replacing the center differential, it seems like it might be the rear differential so I'm replacing it next week.

After the c diff replacement I jacked up a single rear wheel after a long drive and turned the wheel while in neutral. The result was a very difficult to turn wheel that would pop and release l like the diff was binding, once it cooled off it was easy to turn again.

Also when the warmed up while driving, locking up the brakes on the snow (abs fuse yanked) there is an awful grinding noise. I'm hoping this is also the rear diff as one wheel stops rotating first.

I'll let you all know how it turns out, getting tired of fixing this old clunker!
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Old 01-16-2018, 03:20 AM   #28
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2003 wrx stage 2


So I've replaced the center and rear differentials and as far as I can tell I do not have any binding anymore.

The problem I can't figure out is when I brake on snow and lock up tires there is an awful grinding noise, it sounds like it is coming from the transmission. The center diff is freshly installed out of a 2013 WRX.

I can't figure out what this is! Does anyone else experience this horrible grinding when breaking on slippery surfaces? It's much more obvious when I pull the abs fuse.

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Old 11-20-2018, 08:57 PM   #29
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Sorry for digging up an old thread but I'm having a similar issue. Was having the clunking/grinding sound as seen in first video, when the tranny tech at a local auto shop was checking it out, he went forward in first, then reverse and back and forth a few times and the noise went away. (Just replaced trans fluid) and he told me that it might have been the new trans fluid getting into the center diff and it being dry for a bit or something of the sort. Now my car makes that scraping howling noise as in second video, but mainly when in gear and off the gas coasting. Its extremly loud.. think its my center diff?
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Old 11-20-2018, 09:04 PM   #30
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Location: Lisbon, Portugal
2002 Impreza WRX


On the second video, monkeyposeur says it was more than just the center diff...i sugest you take the car to a mechanic that is familiar with these vehicles, or you will end up spending more than i think you want to...
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Old 12-04-2018, 04:41 PM   #31
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Default 2006 WRX 5MT with pieces in the bottom

I found similar pieces in mine after getting a clunking noise in 4th and 5th gears intermittently accompanied by whining around 60 MPH. I found 1 piece of what appeared to be part of a gear (smaller than a dime). I took the diff apart as far as I could but did not see where this piece of metal came from. Next I pulled the center case and found a bunch more pieces of what appears to be three different parts. I ran a magnet into the bottom of the fwd main case and come up clean. I opted to replace the center diff with an ebay used one and flushed the gearbox one time with cheap but clean gear oil and put it back together. It lasted good (30K miles, until I got on ice again. No clunking noise but the slipping internally (RPM and MPH)
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Old 12-27-2018, 07:53 PM   #32
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Hi, im having problems with my Center diff also,

Is it possible for viscous to fail so hard it acts like open one?

My STI has transmission whine from 3 to 5th gear that increases with speed and in snow car acts mostly like fwd, i can make it rwd by pressing footbrake. I can do burnout etc with handbrake on if i like!?

I made this (bad) video to show how open the center diff works. Trans is ty752vb5ba (4.44) stock is 3.90 dccd, im figuring out if trans has broken viscous or uncontrolled dccd. Im sure there is no dccd plug on top of transmission.. Car doesn't have any binding etc, only whines
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Old 01-11-2019, 10:30 PM   #33
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Chapter/Region: NWIC
Location: Redding, California
2002 Impreza WRX


Greaser007 here:
I had chimed in to this thread in Nov 2017, before I tore into my '02 to hunt for the Grumble noise that had developed in my WRX.
Quick history: I bought my WRX in '07 with Salvage title @ 44k on clock.

I am a skier and so spin many hookers in the parking lot for fun. I absolutedly Hate the ABS in the snow. Today, the car has 165k on the clock.
3 years ago, I would develop a Grumble in the drivetrain on or off the gas which is suspected to be a front trans-axle Carrier bearing. So, spring 2017 I remove the Viscious Coupler and transfer-case output shaft. All looks well.
The Viscious Coupler looked New and I tried to press the thing together enough to remove the retainer clip to disassemble and see what is inside to make it work. It wouldn't budge, and so I put new Subaru bearings on the output shaft against my good wishes because they looked fine. I put everyting back together and went for a test spin. The noise wouldn't occur when cold and not make the Grumble noise until driving 15-miles or so.
The transfer-case output-shaft bearings made no difference !

Now that was why in Nov 2017 I mentioned I was going to have to pull transmission to inspect. yep, the ultimatum, fix it myself.
Hmmm, in the '70's I used to tear open VW Bug trans-axles to fix the transmissions, and the WRX is no different, as it just splits right down the middle.

April 2018 I must fix this Grumble:
I dive in to remove my 5-spd transmission to open it up for inspection.
Removing the little bolts for the turbo heat shield was a Booger. Omg, try my patience, yes again and again. When I get to the point of separating the transmission from engine, they don't want to Split !
I tried jacking the front of the engine while the rear of trans was supported and visie-versie, and wound up bolting a big slide hammer to where the bottom trans mount attaches and coerced the thing back away from the engine. I did try propane torch heat on the two dowel pins but it seemed to make no difference, and I did not want to drive a separator down between engine block and trans bell-housing.
The Exedy clutch disc was worn almost to the rivet heads, so it was time for a clutch kit anyway, right ! I got a new Exedy clutch kit from Napa, and oh, the little pilot-bearing for the trans input shaft was Dry, but not seized, which was lucky.
Upon opening up the transmission, all gears and bearings looked and felt smooth and the carrier bearings for the front differential. (open-gears).
I took it to the Subaru dealer and had the trans-guy inspect, and he said to put the transmission back together. I took my rear diff into him for inspection, and he said put it back together.
That was when he looked at me and said "My suspicion is that you need to replace the Vicious Coupler (center-diff), which is a $700 part." and he also mentioned that the Coupler is Non-Serviceable.

Great News ! The new Vicious-Coupler solved the Grumble.

Now, with my odo at 165k, I know what I have in my transmission, and my Grumble is gone, and I now have a nice smooth new Exedy clutch, so I should be good for another 100k miles ! Hooray.

I must add, that after 12-wonderfully FUN years with this WRX, it is worth a 165k mile service job so I can continue to make those Quick-Sprints.

Remember, I bought this WRX with salvage title, and yes, I have one small spot where the bondo is cracked, but hey, she's Paid For & Fun.
( my wife Hates this car ) _ _ _ go figure. she doesn't borrow it.

One Suggestion for the do-it-yourselfer's: layout cardboard under your car to easily slide in and out on the concrete and not get cold or dirty.
also, to easily remove the trans out from under your car without making big scratches in your cement, lay down an old piece of metal roofing, and the trans will slide out on the metal with ease, and not scratch the hell out of your new garage floor. Don't bother if working in the gravel.

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Old 01-23-2019, 09:00 AM   #34
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Default My 06 Baja sport making funny sounds on hard turns when going slowly.

My 06 Baja automatic, makes clunking sounds only when making a hard tight turn when going slowly, never make those sound when going straight or turning fast. Half front/shafts and wheel bearing were replaced but noise was still there, any info on this problem, please help.

Originally Posted by ruedorb View Post
Sounds exactly like mine, I've got it apart, picking up bearings tomorrow and will assemble and have it back in with a replacement differential this weekend. I agree that it's your diff as busted gear pairs should be noisy when cold I would think.
Pretty easy transmissions to work on, took me 2 hours to get the tranny out, another few casual hours to open and assess how much money I want to spend.. And then double time to put it all back! All in it cost me 250 for the diff and 300$ to do transfer bearings, seals, input bearing and 5th gear bearing which I suspect is the source of an annoying bearing noise at idle which goes away when I disengage the clutch.

I'll report back when I confirm it was that diff!
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Old 10-18-2019, 01:29 AM   #35
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Default Revive.

So I've got wrx 5spd. I've been noticing this whine that is only present in gears 2-5 under acceleration only and at all speeds in those gears. It's pretty faint when I'm holding speed but increases in volume as I accelerate. It does this immediately when driving warm or cold. Its almost like it gets more subtle when its warmed up or I may just be used to it, not sure. I do get a different noise under decel but it could just be the clutch I'm not sure. I'm leaning towards it being one of the bearings in the center diff somewhere. Now I do not get any binding or different noises when I do tight circles in both directions at low speeds. If I've read correctly in some of the other threads would I be correct to assume that my center diff(viscous coupler) is fine? What would be some other things to check? Does this sound like it's a spot on bearing problem with the center diff? Fluid levels and coloration are all good. Although I havnt drained the oil to check what's at the bottom.
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Old 10-18-2019, 01:58 AM   #36
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Originally Posted by monkeyposeur View Post
No, I replaced the rear diff as well. It was included with the transmission.

When I was diagnosing the broken trans I drained it and the gear oil was black, even though I had put new gear oil in it a few months earlier. A gear in the center diff was broken. For fun I split the case and everything else looked to be in good shape. Since I was getting a new trans I just threw it all away.

If I were you I would just order a JDM trans from ebay and call it a day.
So you think the cause of the noise in your video was just the center diff being bad?
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Old 10-18-2019, 02:04 AM   #37
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Originally Posted by ruedorb View Post
Thanks Greaser,

Looks like im delayed another few days. I think I can confirm my whirling noise at idle was my 5th gear needle bearing. I replaced the race and bearing, but found the gears pressed in inner race to be toast. Looks like this race cannot be replaced, so i need to find another gear. Have a look at the pic below, you can feel the grooves seen.


As for the ring and pinion bearings, i just left them. But Maybe i should change them, but they look and feel fine.

I'll let you know about the diff when it gets back in, i still have high hopes that it was my problem.
So I get the noise in the second video exactly I get it when my cars cold, I dont get any binding or anything doing tight turns. And I get the noise in gears 2-5th do you think it's a problem with the gears or the center diff?
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