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#3392298 - 06/08/14 03:41 PM Re: Question for Subaru owners [Re: Kiwi_ME]
JTK Offline


Registered: 08/14/03
Posts: 9502
Loc: Buffalo, NY
I get that somewhat.

Just curious because in the ~3yrs I've been active on Subaru boards I've never heard this talked about.

Still cant figure out how it's fluid is kept separate with the 75w90 gear oil.
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#3392314 - 06/08/14 04:01 PM Re: Question for Subaru owners [Re: JTK]
Rand Offline


Registered: 08/20/03
Posts: 11556
Loc: NE,Ohio


10 is center diff
11 is VC
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#3392419 - 06/08/14 06:41 PM Re: Question for Subaru owners [Re: Kiwi_ME]
Rand Offline


Registered: 08/20/03
Posts: 11556
Loc: NE,Ohio
+1 this post is correct.

on the auto if the MPT fails you end up with FWD basically.

on the manual if the VC fails you still have 4wd..just can get 1 wheel peel on any of the 4 wheels.

Originally Posted By: Kiwi_ME
Originally Posted By: buster


Right. It's a sealed unit. You can't change the fluid on a VC. The MTF is different.

When the viscous coupling fails, the AWD is essentially gone.


I'm not sure that's technically correct, depending what you mean by "failure." The manual Subaru has a center diff which will work even if the viscous "LSD" feature is diminished. It's actually more like full-time 4WD.

The automatics with their multi-plate clutch are a totally different AWD concept which is similar to just about every FWD-based on-demand AWD vehicle with electronic control, bringing in the rear axle only when useful. Subaru seems to have done a better job however and they are highly-regarded.
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#3393086 - 06/09/14 02:27 PM Re: Question for Subaru owners [Re: buster]
buster Offline


Registered: 11/16/02
Posts: 30282
Loc: NJ
Thank you, that is correct. However, when the VC goes, the torque transfer is gone. For the MT, it's 50/50 with up to 80/20 20/80 transfer with a properly working VC.
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#3393136 - 06/09/14 03:26 PM Re: Question for Subaru owners [Re: buster]
Kiwi_ME Offline


Registered: 10/24/08
Posts: 1019
Loc: New Zealand
Well, obviously with a component failure something has to change but it's not like it's going to leave you stranded!

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#3393310 - 06/09/14 06:52 PM Re: Question for Subaru owners [Re: buster]
LoneRanger Offline


Registered: 07/02/07
Posts: 2852
Loc: Midwest USA
Someone asked if mine was Manual or Automatic. It's a manual. It's really fun to drive. Using engine braking coming into the entry to a curve then powering through the apex really works well with the this style of AWD Subaru uses in their manual trans. The Nokian WRG2's were a tad squirmy in curves when new but after being scrubbed-in, they handle surprisingly well for such an aggressively siped winter style tread.

The only thing that is a little not perfect is 1st gear ratio is pretty short. I'm shifting to 2nd by the other side of the intersection. But then the short 1st helps for soft road / off road. Although a genuine low range would be best. I think in the Australian market Subaru was offering a low range.
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#3394397 - 06/10/14 09:52 PM Re: Question for Subaru owners [Re: buster]
bulwnkl Offline


Registered: 02/09/05
Posts: 1642
Loc: Arizona
Go have a look around at the Ultimate Subaru Message Board. It's a _much_ more helpful place than many of the model-specific boards, because the guys there tend to be more mechanical types, and interesting-project-types, and so forth. There are PLENTY of threads on failed power transfer clutch packs in most of the A/T Subies, and even a few about the potential for the LSD packs in the M/Ts failing.

There isn't any _good_ reason for the LSD pack in one of the M/Ts to fail before the tranny itself. You'd really have to be beating on it, or rallying it, or something of that sort, IMO.
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#3394686 - 06/11/14 09:43 AM Re: Question for Subaru owners [Re: buster]
buster Offline


Registered: 11/16/02
Posts: 30282
Loc: NJ
Thanks bulwnkl!
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