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Old 05-20-2007, 05:40 PM   #1
alanlcit
Scooby Newbie
 
Member#: 71108
Join Date: Sep 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2005 WRX STi
Silver

Default 2005 STi Rear Diff Top Plug Size

I apologize if I'm asking a question that is answered somewhere else. I've spent some time looking for this info in the Unabomber FAQ and elsewhere, but have come up empty. (The scoobymod link is only for the WRX, not the STi diff.)

I am looking to change the rear differential fluid on my 2005 STi, I have the LSD oil from Subaru and the 3-bond stuff that is recommended in the service manual. So I think I'm set on materials.

Tools are another issue, though.
My understanding is that the bottom plug will come out fine with a 1/2" drive (possibly with an extension for clearance). I've got that covered.

However, the top plug is proving to be more difficult. It looks like about 32mm, but it needs to be a deep socket to clear the protrusion left by the temp sensor connection. I haven't been able to find a 1/2" drive deep socket 32mm at Sears (in fact, it's not in their catalog either). I could also just use a conventional 32mm wrench instead, assuming that 32mm is the right size. Either way, I need to buy a new tool, and I don't want to get the wrong size....

Questions:
1) What is the exact size of this top plug?
2) Do you generally use a socket or a wrench to loosen the top plug? Does it matter?
3) How often should you typically change the rear diff fluid on a daily driver, driven hard occasionally?
4) Anything else I should know about this job?
5) Suggestions on places to get the appropriate 1/2" drive deep socket, if that's what is preferred....

Thanks.
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Last edited by alanlcit; 05-20-2007 at 07:12 PM. Reason: Added a sentence...
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Old 05-21-2007, 02:10 AM   #2
z
Scooby Specialist
 
Member#: 41762
Join Date: Aug 2003
Chapter/Region: International
Location: House of Pancakes
Vehicle:
04 STi
CT-DE-FL rinse+repeat

Default

Took me a while to find it too...search was hanging for me too.

I used an open ended wrench on the smaller portion that the temp sensor goes into...
I don't recall the exact size though, sorry...
Other than that, it's a very straightforward procedure. I'd drive it a bit first so the gear oil heats up and thins out a bit.

http://forums.nasioc.com/forums/show...ight=rear+diff



Last edited by z; 05-21-2007 at 02:27 AM.
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Old 05-21-2007, 04:10 AM   #3
alanlcit
Scooby Newbie
 
Member#: 71108
Join Date: Sep 2004
Chapter/Region: SCIC
Location: San Diego, CA
Vehicle:
2005 WRX STi
Silver

Default

Quote:
Originally Posted by zavigm View Post
Took me a while to find it too...search was hanging for me too.

I used an open ended wrench on the smaller portion that the temp sensor goes into...
This should be all the info I need! Thanks...
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Old 05-21-2007, 09:36 AM   #4
z
Scooby Specialist
 
Member#: 41762
Join Date: Aug 2003
Chapter/Region: International
Location: House of Pancakes
Vehicle:
04 STi
CT-DE-FL rinse+repeat

Default

no prob
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