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Old 11-30-2007, 04:23 PM   #1
jobber
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Default Tranny/Rear end fluid change on 2005 WRX, with pics

Tranny/Rear end fluid change on 2005 WRX, with pics

This is the T70 socket you need for most of 2005-up. Maybe mid-2004 and up? I just put in T70 on Amazon and bought 2 of these, 1 for backup.



This is what the tranny dipstick looks like. I had to remove nothing to get to it. Mainly because of this killer funnel I got at Kragens.



My oil choice, there are enough oil debate threads, dont make this one of them. I'm old school and used plain old oil. I been modding my cars for at least 15 years, using synthetic sometimes. This time, I chose regular oil.

UPDATE: This oil is terrible in my tranny. All gears got way worse. I will be changing it out soon for the cocktail.



Pic of the drain plug still in:



Popped the drain plug off and let it drain until it was a very slow drip/stopped.



The tranny drain plug and its magnet. This pic shows the amount of metal buildup I had on my magnet:



For comparison, the cleaned up drain plug:



The T70 bolt itself:



With drain plug torqued properly, the fill starts. I found some posts saying 32.5 ft. lb, and some posts showing 50 ft lbs. I used 40 ft lb or so until I find a proper 2005 manual. The flexible funnel shows how easy it is to fill.



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Last edited by jobber; 01-07-2011 at 08:02 AM.
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Old 11-30-2007, 04:24 PM   #2
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I used 3 quarts exactly...



to reach this almost perfect dipstick..



I added MAYBE 1/4 of a quart more after that, which got it just where I wanted it. So 3.25 quarts for me.



BONUS PICS - REAR END FLUID JOB

You dont have any leverage room to get the 2 rear end plugs out with car on ground. I simply put my floor jack under the big 1/2" drive rachet and it broke them loose with 2 pumps. I could get them plenty tight when I reinstalled.

Pic of the amount of metal on my rear end drain plug:



After cleaning, for comparison:



The location of the two bolts, very easy. I didnt jack up the car at all:



Don't mix up the rear end plugs. They look the same before you take them out:



The magnet plug goes in the bottom hole obviously:



Filling was not too big a deal. I first tried the bottles by themselves, but couldn't get the proper angle. I took a foot of my silicone hose and it was golden. The hose can even angle down, as long as the bottle is aimed down for pressure.



I used that 3/4+ quart or so bottle in the rear end, right as fluid started draining out the fill hole indicating it was full. I used hi-tack red gasket liquid on the threads instead of teflon tape. I doubt it would even leak bare, but it was added insurance.

Conclusion:

My tranny fluid was dirty and my rear end fluid was much worse. I am glad I got these both changed for my own piece of mine. I got this car less than a month ago with 57,000 miles on it.

Last edited by jobber; 01-07-2011 at 08:03 AM.
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Old 11-30-2007, 04:55 PM   #3
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Great write-up and the pics are great. Kudos
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Old 12-03-2007, 04:30 PM   #4
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for the bolts that you took out, do you have to replace the washers ?
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Old 12-03-2007, 04:51 PM   #5
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only the drain plug had a washer and i didnt replace it. it was a non-crushing copper gasket and was fine.
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Old 12-03-2007, 05:06 PM   #6
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If you want to go by the book...

The rear diff plugs use Three Bond 1105. It's a liquid gasket/sealant. PN 004403010.
As jobber mentioned, the tranny washer/gasket is non-crushing and I've had no problems re-using it. PN 803926070.
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Old 12-03-2007, 05:09 PM   #7
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nice write up!!!!!

but then how did you remove the dipstick w/ intercooler off....?
I tried to take it out..but then I coudnt do it....
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Old 12-03-2007, 09:38 PM   #8
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Quote:
Originally Posted by bzbuzz View Post
nice write up!!!!!

but then how did you remove the dipstick w/ intercooler off....?
I tried to take it out..but then I coudnt do it....
06's must be different than 05's..
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Old 12-04-2007, 07:46 AM   #9
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Quote:
Originally Posted by _JsWRX View Post
for the bolts that you took out, do you have to replace the washers ?
From the 2005 Impreza service manual:

Tranny drain plug: replace the gasket/washer and the tightening torque is 51.6 ft/lbs.

*this is for the 5MT NOT the 6MT (STi)

Rear Diff.: use liquid gasket on drain plug and filler plug and tighten to 36.2 ft/lbs.
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Old 12-04-2007, 05:26 PM   #10
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Great write-up!

I did the change at 3k miles and reused the copper gasket on trans and did-not use sealant on rear-end plugs. Thus far I have no leaks.

Respectfully, if you are going to change the rear-end fluid, it is advisable to see if you can first remove the top/fill plug. Why? Because if you can't get it off, but you were able to remove the bottom/drain plug, and you drain the fluid out, then how do you refill it?

On the 2006 WRX you can remove the trans dip-stick w/o removing the I/C. It becomes a bit more cramped if you installed the turbo heat-shield, but it can be removed none-the-less.

The 2006 WRX takes 3.7qts in the trans and 0.8qts in the rear diff.

------------------

Jobber, did you change out the fluid yet?

How important is it to use the sealant on the rear diff plugs (if I have no leaks)?

I'm using the Valvoline Super-Syn w/o any problems, but again I have a 2006.

What TMIC do you have?

Thanks.
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Old 12-04-2007, 06:54 PM   #11
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Quote:
Originally Posted by Big-E View Post
Jobber, did you change out the fluid yet?

How important is it to use the sealant on the rear diff plugs (if I have no leaks)?

I'm using the Valvoline Super-Syn w/o any problems, but again I have a 2006.

What TMIC do you have?

Thanks.
I changed it using the above oil. Now I will be changing it again in 2-3 days to the cocktail. Sealant on diff plugs isnt important at all, unless your leaking. Those plugs rarely leak when tightend properly. I have the stock 2005 TMIC.
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Old 12-06-2007, 11:03 AM   #12
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ahhh nice write-up!
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Old 12-06-2007, 12:07 PM   #13
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I just got done draining this crappy oil. Will be putting in my cocktail in the next 30 mins. It's a stress free job, very easy.
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Old 12-06-2007, 12:47 PM   #14
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Finished the cocktail install. The Redline is the thickest. The synchromesh is the thinnest. The Castrol Hypol was in between. Can't wait to get it all mixed up next time I drive.
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Old 12-08-2007, 01:06 PM   #15
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why not "F" level tho?
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Old 12-08-2007, 01:14 PM   #16
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ahh cuz it expands a tad and just to be safe.
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Old 12-08-2007, 01:32 PM   #17
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Quote:
Originally Posted by jobber View Post
ahh cuz it expands a tad and just to be safe.
....I have found that these 5MT's like to be a bit 'over', better, than ANY 'under'
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Old 12-08-2007, 08:26 PM   #18
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Quote:
Originally Posted by Uncle Scotty View Post
....I have found that these 5MT's like to be a bit 'over', better, than ANY 'under'
+++++1 yeh..i've noticed the same thing...
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Old 12-08-2007, 09:34 PM   #19
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hmm ill measure it again when i have time.
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Old 03-29-2008, 12:36 AM   #20
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Bump for best tranny/rear diff fluid change thread.

Im doing mine next weekend using the same Valvoline 75w90, why pay more for the synthetic stuff when the regular dino works fine.
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Old 03-29-2008, 01:52 AM   #21
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wow this is a great write up...better pics than Scoobymods I'm doing this in a few weeks...i'm glad to see taking the intercooler off isn't necessary. I grabbed Redline Lighweight Shockproof for the tranny and the gear oil for the diff off Amazon. I'm going to the dealer and pick up a new trans plug gasket just in case.

*subscribed...great write up
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Old 03-29-2008, 01:53 AM   #22
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thanks. i made this a long time ago.
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Old 12-26-2008, 01:59 AM   #23
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YES; finally some pictures. I'll be doing this pretty soon. Gonna grab some Redline Lightweight Shockproof for the tranny & something thick for the rear.
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Old 01-06-2009, 10:36 PM   #24
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good explanation and pics!
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Old 01-07-2009, 11:32 AM   #25
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Flexible funnel ftw, great idea! I'm going to pick one of those up plus a differential socket before I do my 60k fluid change. Great write up.
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