Thanks for the replies everyone.
I think Rays idea of replacing the diff is probably going to be the way I'll go.
Even though her model of Outback wasn't popular (3.0R flat six), I was able to find a dozen rear diff's for her model on car-parts.com.  so, for somewhere between $100 and $500 I should have it back on the road.
I'll tell you, though, I'm going to do a full inspection on the car to see what else is hosed up from the flood-crossing.  If it looks like there's much more to replace, you may see an add stating "Subi 3.0R for sale - with freshly washed undercarriage".
Maybe next time I'll believe her when she says that the water she crossed was "really deep".

-Chuck


Ray Ayala wrote:
Under the circumstances it's probably cheaper to look for a good used diff. Replacing the pinion bearings (and I certainly would under the circumstances) means going to a gear shop for a full setup ... plus the cost of all the bearings.


----- Original Message ----- From: "Chuck" <[EMAIL PROTECTED]>
To: "miatapower List" <[email protected]>
Sent: Wednesday, September 10, 2008 6:04 PM
Subject: NMC: how bad did she kill the diff?


Long story short, my wife drove her Subi Outback through the massive
midwest floods a few months ago.  Apparently the water was deeper than I
thought.....

The car developed a low pitch rumble from the back end recently (2 mos
and about 5k miles since the flood).  It suddenly hit me that it
probably has water in the rear diff.  Ugh.  I drained the diff tonight
and it was a beautiful milky white color.  The fluid wasn't over-full,
but it was certainly contaminated with plenty of water.
I flushed/filled it twice to get the contamination out, and the rumble
is much quieter at this point.

So... any idea how tough it is to do bearings and seals in a Subi
differential?
Does anyone know the failure mode for diff bearings?  I don't think I'll
have time to get to this repair for a while.
Also, assuming the water was above the diff but below the air intake,
what else should I check for water contamination?

thanks!

-Chuck

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