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Old 08-20-2013, 09:17 AM   #1
L1no
Scooby Newbie
 
Member#: 365514
Join Date: Aug 2013
Location: Madison, WI
Vehicle:
2002 WRX Wagon
PSM

Default WRX Transmission whine/tick

I've spent the past few days searching my heart out for a solution to my problem with no avail. Some similar, but not quite the same. I have some ideas of what it might be, but thought I'd post up my problem on here incase someone else has this problem. I will update the thread with a solution, given I find one.

Problem:
Transmission whines/ticks when...
-in any gear
-most prominent in 4th and 5th
-goes away when I put it into neutral and coast
-quieter when decelerating
-no volume difference when accelerating vs. constant speed.
-no grinding noises
-higher speed = higher volume of the whirring/whine

Now, from that I have come to the conclusion that it probably isn't center differential related because when I push the clutch in at speed, the sound goes away (Center differential spins when wheels spin). I don't think it is the throw out bearing because at idle the noise is really quiet and doesn't change (that I can tell) when the clutch is pushed in. I'm not going to dismiss the throw out bearing being bad in addition to this problem though as it is still on the original clutch with 167,000 miles! Sound also does not change with load like it usually does when an input shaft bearing is bad.

Suspects:
Throw out bearing
Input shaft bearing


Noise is similar to this:

Any information on this is appreciated.
Thanks.
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Old 08-20-2013, 01:01 PM   #2
RoadKillDMD
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Member#: 284792
Join Date: Jun 2011
Chapter/Region: RMIC
Location: Vanilla Valley, CO
Vehicle:
2011 STI
Blurple

Default

Any driveline mods?
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Old 08-20-2013, 01:10 PM   #3
L1no
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Member#: 365514
Join Date: Aug 2013
Location: Madison, WI
Vehicle:
2002 WRX Wagon
PSM

Default

Completely stock, the only things aftermarket on the car is an up pipe, down pipe, and catback.
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Old 08-20-2013, 06:02 PM   #4
Uncle Scotty
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Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

ticking is almost always a broken tooth on a gear
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Old 08-20-2013, 08:10 PM   #5
L1no
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Member#: 365514
Join Date: Aug 2013
Location: Madison, WI
Vehicle:
2002 WRX Wagon
PSM

Default

The ticking is from an exhaust leak that I just found. It sounds just like the one in the video I posted. Not very noticeable until you get up to 4th and 5th gear. I couldn't hear it when I bought the car because it had a large exhaust leak after the downpipe to give you an idea of the volume of it.

I also just double checked and it doesn't sound any different when idling at a stop with the clutch in versus clutch out. That is the part that has me most stumped.

I've read that a short shift kit can sometimes make noise and the previous owner did have one installed so I'm going to check that now and grease everything back up.
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Old 08-20-2013, 09:18 PM   #6
L1no
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Member#: 365514
Join Date: Aug 2013
Location: Madison, WI
Vehicle:
2002 WRX Wagon
PSM

Default

Well I took the center console out to get to the shifter and everything seemed fine so I took it for a quick drive with everything still off. Totally changed what I could hear! I can now hear that it makes the whirring noise at all speeds, regardless of what gear, even in neutral.

So, I'm back to the center differential. I'll be tearing it out soon, expecting to see some bearing damage/pitting.

For those looking for a DIY on center differential bearing replacements: http://forums.nasioc.com/forums/show...2071286&page=3
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Old 09-03-2013, 09:59 AM   #7
L1no
Scooby Newbie
 
Member#: 365514
Join Date: Aug 2013
Location: Madison, WI
Vehicle:
2002 WRX Wagon
PSM

Default

Just wanted to update this thread for those who will be searching later.

I ordered the four center diff bearings from a subaru dealership totaling about $170. There was no apparent damage to the bearings that were in there, except one roller had some almost microscopic pitting. Threw the bearings in the oven at 250F and the shafts in the freezer for a few mins and they popped right into place (had to tap one of them on).

I've driven about 500 miles and the noise is still gone! Success!
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Old 09-03-2013, 01:57 PM   #8
Samurai Jack
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Member#: 21145
Join Date: Jul 2002
Chapter/Region: NESIC
Location: Not in my own time
Vehicle:
2002 Enemy of Aku

Default

Glad to hear this was an easy, and fairly inexpensive fix. Subscribing to add to my library
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Old 09-06-2013, 05:04 PM   #9
alinas82
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Member#: 367633
Join Date: Sep 2013
Location: Dearborn, Mi
Vehicle:
2006 Impreza wrx
Grey

Default

Since i bought my 2006 wrx ive been hearing a low whining noise when the car is in 3rd and 5th gear but the gears are fine transmission is smooth . 2 weeks ago this sound got louder all of a sudden and i started hearing it on all gears. the sound gets louder when i step on the gas and it goes away if i step on the clutch or put the car in neutral .i took it to mechanic and he said the sound is coming out from the end of the transmission i think he named it as center diff ... Anyways i looked for a used transmission and it cost between $1500-2200 used ...... Any suggestions !!! Thank you
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