I didn't know I needed this. . . (rear diff cover with cooling fins) - Subaru Outback - Subaru Outback Forums
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post #1 of 27 (permalink) Old 07-06-2015, 07:02 AM Thread Starter
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I didn't know I needed this. . . (rear diff cover with cooling fins)



This was underneath an 03 Legacy SE wagon I sold recently. Never saw a cover like that on a Subaru. . . not even a WRX.

They're usually really boring and look like this:



Guess I'm gonna have to start buying more Legacies!

(probably don't need it, it just appeals to the l337 auto nerd in me)



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post #2 of 27 (permalink) Old 07-06-2015, 08:25 AM
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You can always add one (on some models) for extreme racing applications/conditions...

http://www.cuscousainc.com/downloads...tial_cover.pdf


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post #3 of 27 (permalink) Old 07-06-2015, 08:29 AM
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Quote:
Originally Posted by lockmedic View Post


This was underneath an 03 Legacy SE wagon I sold recently. Never saw a cover like that on a Subaru. . . not even a WRX.
Actually, I noticed that the temperature in the rear differential in both my Subaru's is about 20F higher than the temperature in wheel bearings. Therefore, putting fins in the rear differential makes sense in providing more dissipation of heat.
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post #4 of 27 (permalink) Old 07-06-2015, 09:01 AM Thread Starter
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Absolutely. . . I've just never seen an OEM finned rear diff cover. . . let alone on a lowly Legacy wagon. This is the sort of thing I'd expect to see on an STi. . . and apparently it's an aftermarket item there.


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I seem to get a lot of "will xx fit in my car?" emails. . . I'm not the authority on everything Subaru, so I very well may tell you the wrong answer as there's nobody else to check me. Please search or ask via the forums first. . .when I answer you via email, it never gets posted and nobody else can confirm or refute my answer.
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post #5 of 27 (permalink) Old 07-06-2015, 09:10 AM
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Quote:
Originally Posted by lockmedic View Post
Absolutely. . . I've just never seen an OEM finned rear diff cover. . . let alone on a lowly Legacy wagon. This is the sort of thing I'd expect to see on an STi. . . and apparently it's an aftermarket item there.
possibly a issue of one or more of the following.

"customer wants car back ASAP, and is wiling to pay whatever the cost is, (even if no other cheaper typical alternatives are offered or explored)."

someone looked up the gear ratio, and pulled that part new or used.


or someone delivered the race part on the shelf, vs. the plain jane that was next to it.

like if someone ordered a 351 Windsor engine, and got a 351 Modified race engine. ....as they were just all sitting together.


Maybe you should have pulled that "thing" off there, and swapped on a plain jane.

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post #6 of 27 (permalink) Old 07-06-2015, 09:25 AM Thread Starter
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I probably would have but customer was on his way for the car, I only jacked it up to swap wheels. If I would have noticed it on the way in I might have swapped it for an 'upgraded' H6 outback VLSD and shelved the nice finned one.

I need to get with the new owner in a few days anyway, might see if he wants to trade. Older missionary couple, sorta doubt they're the type to pull the front axles and turn it into a drift tank and thus benefit from a finned rear diff cover.

Posted the same pic to the definitive source for all weird things Subaru: NASIOC. . . well, them and @rkrenicki. We'll see if anyone else has seen one.


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post #7 of 27 (permalink) Old 07-06-2015, 09:46 AM
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Perrin makes (made?) a finned cover for the R160 series of diffs, but I haven't seen that one before... Where is the fill plug? On the upper right side?

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post #8 of 27 (permalink) Old 07-06-2015, 09:51 AM
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Just checked my 2006 3.0 - it has a finned rear cover to the diff, not as extensive as shown above but still.....
It's stock (as far as I know).
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post #9 of 27 (permalink) Old 07-06-2015, 10:03 AM
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Well, turns out that it is OEM. I found one for sale here from a 2002 Legacy L: 03 04 05 06 07 08 09 Subaru Legacy Rear End Carrier Pumpkin Differential | eBay

According to Opposedforces.com it was on 2000-2002 Legacy L and Legacy Brighton only. The part number is 38300AC130.

That explains why I havent come across it, as I focus on 2003-2004 and only GT or Outback for earlier years.
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post #10 of 27 (permalink) Old 07-06-2015, 11:25 AM
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I just found this notation on Off Road subarus:

OffRoo'd FAQ - Off Road - Ultimate Subaru Message Board

..." '00 and newer Subaru Foresters and Legacys are available with 4.44 R-160s (open or viscous LSD), with rumors pointing to the finned rear cover being a clue to the identity of the LSD differentials. "...


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