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Old 01-23-2018, 01:53 PM   #1
cmiovino
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Member#: 134005
Join Date: Dec 2006
Chapter/Region: MAIC
Location: Pittsburgh, PA
Vehicle:
2004 WRX Premium
PSM

Default 4EAT/Diffs Plan

2004 WRX used for autocross exclusively (Stage 2, 136k). Minimal commuting, maybe 2-3 times a month. Vehicle sees approximately 20-25 events per season and also a few drives to events 3 hours away.

I'm currently running Subaru ATF-HP, fluid and filter were changed about 35k ago. Front and rear diffs are running Extra-S. All this was changed about 4-5 years ago.

Plans:
- Subaru ATF-HP for the tranny, new external filter, same washer as the oil.
- 3 quarts Motul Gear 300 (75w90) for the front/rear diff. No rear diff washer, front diff has a separate part number.

Process:
- Drain and fill for the ATF. Buying at least 8 quarts and doing this method twice. Changing the filter after the final time. Check fluid level when warm and running.
- Rear diff seems easiest. Drain and fill until it comes out (approx 0.8 quarts). Purchased a pump to help get the fluid in.
- Front diff, T-70 bit purchased. Drain, new washer, fill via dipstick (1.2 quarts).

Anything I'm missing? Comments on process or oil used?
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Last edited by cmiovino; 01-23-2018 at 02:19 PM.
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Old 01-24-2018, 11:52 PM   #2
Drew's Rex
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Member#: 151422
Join Date: Jun 2007
Chapter/Region: BAIC
Location: Concord
Vehicle:
2005 Impreza T

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I would get an trans cooler if anything. Cooling system in the subie is not the greatest. Maybe upgrade the radiator.
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Old 01-25-2018, 09:57 AM   #3
cmiovino
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Quote:
Originally Posted by Drew's Rex View Post
I would get an trans cooler if anything. Cooling system in the subie is not the greatest. Maybe upgrade the radiator.
Radiator is already upgraded to a Koyo unit. Point taken on the trans cooler.
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Old 02-18-2018, 10:35 AM   #4
Wussman24
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Join Date: Aug 2007
Location: KCMO
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2003 2.5RS
Rattl'd white

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Did i miss something or do you already have a trans cooler. Ifyou have upgraded your radiator, what did you hook your transmission lines to? The stock radiator has a trans cooler at the bottom and you lose that with any aluminum upgrade.
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Old 02-20-2018, 08:45 AM   #5
Titter
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Member#: 416107
Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT/Diffs Plan

there is no aftermarket full aluminum rads for AT subarus that have the trans cooler built in.

there are only OEM replacements. if you bought a Koyo Alum rad, you have no trans cooler. you will need to install an external cooler.
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Old 02-20-2018, 10:32 AM   #6
Samurai Jack
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2002 Enemy of Aku

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Quote:
Originally Posted by Titter View Post
there is no aftermarket full aluminum rads for AT subarus that have the trans cooler built in.

there are only OEM replacements. if you bought a Koyo Alum rad, you have no trans cooler. you will need to install an external cooler.
Are you sure about that?
https://www.rallysportdirect.com/par...c-transmission

This Koyo has the provision for the AT cooler built in
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Old 02-21-2018, 07:17 AM   #7
cmiovino
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Quote:
Originally Posted by Samurai Jack View Post
Are you sure about that?
https://www.rallysportdirect.com/par...c-transmission

This Koyo has the provision for the AT cooler built in
Bingo, this is the exact one I used.
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Old 02-21-2018, 08:52 AM   #8
Titter
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Location: Ontario, Canada
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2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT/Diffs Plan

yes im sure. thats an OEM replacement, not a full aluminum.

mishimoto also makes one.

noone makes a full aluminum AT rad. i looked for months.

but glad the OP has a cooler installed . i didnt know koyo made oem replacements. i only thought they did full aluminum.
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Old 02-21-2018, 10:02 AM   #9
Samurai Jack
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Quote:
Originally Posted by Titter View Post
yes im sure. thats an OEM replacement, not a full aluminum.

mishimoto also makes one.

noone makes a full aluminum AT rad. i looked for months.

but glad the OP has a cooler installed . i didnt know koyo made oem replacements. i only thought they did full aluminum.
Sorry, you DID say full aluminum.
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Old 02-21-2018, 06:44 PM   #10
jamal
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You could probably use this one and run the trans lines to it instead of setting up the oil cooler.

https://www.rallysportdirect.com/par...sandwich-plate
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Old 02-21-2018, 08:26 PM   #11
Titter
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Member#: 416107
Join Date: Mar 2015
Chapter/Region: International
Location: Ontario, Canada
Vehicle:
2002 WRX Wagon
EJ207 Spec C 4EAT

Default 4EAT/Diffs Plan

thatís a nifty piece. good find!

you would need custom lines. the oem lines wont fit those connectors. 4plate isnt that big. it might not cool enough if u drive with a heavy foot.
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