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01 OUTBACK VDC H6
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Discussion Starter · #1 ·
Folks:

The center diff (viscous coupling) in my 04, 5mt Outback is noisy and I am about to replace it. When it is hot, after being driven on the highway, it makes a grinding kind of noise when you turn the wheel hard left or right. I understand this is the viscous coupling failing. It also makes a loud whirring noise at all speeds but louder of course at higher speeds. Is this the Viscous coupling making the noise or are their bearings that are bad because of the viscous couplng.

Feedback would be appreciated as I have to order parts this week. Thanks.
 

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2000 (2nd Gen) Outback wagon 2.5 manual Dual Range
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79 Posts
how did you go with this problem? I have the same issue and am interested to know what you have done already. Here in Australia the center Diff is $1400 (Aus) which is almost the same cost in US dollars. Wonder how much it cost you guys?
 

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I have the same issue . . .
The symptom descriptions (grinding on turns, whirring at other times) aren't necessarily that of a faulty center VC in the MT. They could also be describing a bad wheel bearing, which is far more common, and far less expensive to fix.
 

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2000 (2nd Gen) Outback wagon 2.5 manual Dual Range
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79 Posts
The symptom descriptions (grinding on turns, whirring at other times) aren't necessarily that of a faulty center VC in the MT. They could also be describing a bad wheel bearing, which is far more common, and far less expensive to fix.
Many Thanks for the tip.
I took my car to a an ex-Subaru guy who runs his own shop (only works on subaru's and EVO's) and he had a look at it. He said that he was 99% sure it's the center Diff. Guy seemed honest and was recommended by a few people on other subaru forum's.
 

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'05 Outback 2.5i - 5-Spd Manual (Now with a new Family)
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If you are going to spend the money to replace it, you might want to consider replacing it with a torsen style center diff (mechanical - Basically what Audi's better systems use). The price is steep (I believe $1,650 as last quoted to me, and available through Rallispec), but a signifigant upgrade (IMHO) to the viscous coupling center that comes with the cars..
 
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