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Old 01-08-2006, 05:49 PM   #1
bren wrx
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Default Counter measure to rear diff noise...HELP

http://techinfo.subaru.com/html/dis...sp?doc_id=79712

Service Bulletin #03-55-05
Pages: 2

Bulletin Description: A countermeasure has been made to address noise coming from the rear differential area. The noise may make a high frequency Hoo (Harmonic) noise and is most noticeable with little to no throttle application (coasting or deceleration). The peak of the noise occurs at 63mph (100km/h). The noise may occur in any gear or engine speed; however it is most noticeable in 4th gear (4EAT equipped) or 5th gear (5MT equipped). Dynamic dampers were added to the rear differential member to eliminate the noise. If you encounter a customer complaint prior to the countermeasure, follow the procedure on page 2.


I have this problem like crazy, dealership has never heard of it, any idea or links to page 2 procedure? thanks.
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Old 01-09-2006, 03:32 AM   #2
DrBiggly
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Try this: Keep the front tires 4psi higher than the rear. Just a change in tire pressure can often make the difference. The '02s had issues with the clutches and such making noise but I believe the rear diffs were a bit noisy and thus a co-culprit.

-Biggly
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Old 01-09-2006, 07:23 AM   #3
DrD
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That bulletin appears to apply to 04+05 cars - anyway, here's a link to it on Scoobymods
http://www.scoobymods.com/forums/showthread.php?t=5275
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Old 01-11-2006, 04:50 PM   #4
subieworx
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This is a well documented problem on the 04/05. I am finally taking my car in tomorrow to have it looked at. Hopefully they don't mind the mods.
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Old 01-11-2006, 05:18 PM   #5
Turn in Concepts
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Quote:
Originally Posted by subieworx
This is a well documented problem on the 04/05. I am finally taking my car in tomorrow to have it looked at. Hopefully they don't mind the mods.
HAHA!!! You are so screwed!!

Edit: See, they totally treated you like garbage. Stupid local dealers. Good thing Jamie is so helpful so you can get the part at a decent price. Big thumbs up for Subie Gal!!

Last edited by Turn in Concepts; 01-12-2006 at 10:13 PM.
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Old 01-21-2006, 02:16 PM   #6
mpbikerxt
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Quote:
Originally Posted by DrBiggly
Try this: Keep the front tires 4psi higher than the rear. Just a change in tire pressure can often make the difference. The '02s had issues with the clutches and such making noise but I believe the rear diffs were a bit noisy and thus a co-culprit.

-Biggly

keep the tires 4 psi higher in the rear??? even the factory recommends 30 rear 36 front - this can be found on doorsill and in the owners manual... i have 245/45/17s all around on my 05 sti and i keep them at 45 front 40 rear for my day to day stuff... all the weight is on the front - dont know why you would want more air in the rear... if there is a noticable noise - that should def. be a warranty issue... it would be total b.s. to contradict what the owners manual says just to make the vehicle act and sound how its supposed to ... thats a warranty issue for sure man... i wouldn't mess around w/ your tire pressure that much... dont get me wrong - try it out - but you will be sourly disappointed in the traction you get thereafter..
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Old 01-22-2006, 09:57 PM   #7
sparco
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Default Problem with GC8

Well if you play with front and rear pressure you could effect some balance between all the diff's and drive line. But for handling, an increase in front tire pressure would induce more understeer, as increased rear pressure would induce some over steer. Old autocross trick I learned the hard way once.

Now for my some what related question. I just installed wrx 5spd drivetrain. After a few hundered miles I started having this same problem and it really kicks in at around 63 mph like the bulletin said. Now when I was staring blanklie at my rear carrier when it was up on the lift, I noticed the dampners installed on my GC8 carrier. Now would any one know if there was a diffrence between the balancers on a GC8 vs. the newer carriers?

I'm not sure if I should take the 25 mile highway trip to my nearest subaru dealer or if I should just try removing the current balancers and keep my fingers crossed that the insane noise will go away?

Any ideas?

Thanks
Danny
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Old 01-23-2006, 08:15 AM   #8
subieworx
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Quote:
Originally Posted by mpbikerxt
keep the tires 4 psi higher in the rear??? even the factory recommends 30 rear 36 front - this can be found on doorsill and in the owners manual... i have 245/45/17s all around on my 05 sti and i keep them at 45 front 40 rear for my day to day stuff... all the weight is on the front - dont know why you would want more air in the rear... if there is a noticable noise - that should def. be a warranty issue... it would be total b.s. to contradict what the owners manual says just to make the vehicle act and sound how its supposed to ... thats a warranty issue for sure man... i wouldn't mess around w/ your tire pressure that much... dont get me wrong - try it out - but you will be sourly disappointed in the traction you get thereafter..
Re-read what he said. You got it backwards.
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Old 01-23-2006, 06:10 PM   #9
Jasper
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i still say you try my idea i said on AIM. its wayyyyyy cheaper than ALL dealership options, and if it doesnt work, you're only out $10. total...including changing the rear diff fluid.
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Old 02-05-2006, 12:16 PM   #10
strohausii
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Quote:
Originally Posted by mpbikerxt
keep the tires 4 psi higher in the rear??? even the factory recommends 30 rear 36 front - this can be found on doorsill and in the owners manual... i have 245/45/17s all around on my 05 sti and i keep them at 45 front 40 rear for my day to day stuff... all the weight is on the front - dont know why you would want more air in the rear... if there is a noticable noise - that should def. be a warranty issue... it would be total b.s. to contradict what the owners manual says just to make the vehicle act and sound how its supposed to ... thats a warranty issue for sure man... i wouldn't mess around w/ your tire pressure that much... dont get me wrong - try it out - but you will be sourly disappointed in the traction you get thereafter..

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Old 02-24-2006, 01:52 PM   #11
mikeyc
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JasperSTI, any chance you'd feel like sharing your idea? I'm curious to see if it'll fix the noise I've got out of my WRX rear diff.
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Old 02-24-2006, 02:05 PM   #12
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I have the new crossmember dampeners to install. Hopefully that will help.
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Old 02-25-2006, 10:21 AM   #13
Jasper
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Quote:
Originally Posted by mikeyc
JasperSTI, any chance you'd feel like sharing your idea? I'm curious to see if it'll fix the noise I've got out of my WRX rear diff.

im on my way out of the house right now (stupid open house thingy), and wont be back for a couple of hours. drop me a PM w/ your AIM screenname and i'll tell ya all about it.
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Old 02-26-2006, 11:04 AM   #14
subieworx
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Quote:
Originally Posted by Turn in Concepts
I have the new crossmember dampeners to install. Hopefully that will help.
Well, the new damper things looked identical to the old ones and only slightly lowered the noise level, but by no means eliminated it.
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Old 03-06-2006, 04:10 PM   #15
bren wrx
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Quote:
Originally Posted by subieworx
Well, the new damper things looked identical to the old ones and only slightly lowered the noise level, but by no means eliminated it.

oh really?

im going to install mine soon, ill drill my stock cross member for them to fit
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