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2011 STi Trans/Diff Plug Washers
2011 STi Trans/Diff Plug Washers
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Old 05-30-19, 02:10 AM   #1
fletcher
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Default 2011 STi Trans/Diff Plug Washers

About to flush my trans/diff fluids and trying to find the appropriate OEM washer part numbers to replace them. I'm finding lots of differing info online and the FSM doesn't offer part numbers for washers .

For both rear diff plug washers I have found 803920050 the right fit based off my research

For the Oil pan trans plug washer I found 803926090 and then for the clutch side plug washer I found 803916100. I'm confused about the filler plug washer but assumed 1 of 803918060 or 803926090 should be it.

If anyone can confirm these part numbers that would be incredibly helpful.

Thank you!
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Old 05-30-19, 04:43 AM   #2
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Default Re: 2011 STi Trans/Diff Plug Washers

Quote:
Originally Posted by fletcher View Post
About to flush my trans/diff fluids and trying to find the appropriate OEM washer part numbers to replace them. I'm finding lots of differing info online and the FSM doesn't offer part numbers for washers .

For both rear diff plug washers I have found 803920050 the right fit based off my research

For the Oil pan trans plug washer I found 803926090 and then for the clutch side plug washer I found 803916100. I'm confused about the filler plug washer but assumed 1 of 803918060 or 803926090 should be it.

If anyone can confirm these part numbers that would be incredibly helpful.

Thank you!
I found this on the Subaru parts website, which is also the same as my '16's fill plug gasket: Trans Fill Plug - 803918040

I think I have a post on here about torque specs in case you need them. What should i do?
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Old 05-30-19, 10:50 AM   #3
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Default

Quote:
Originally Posted by raisingAnarchy View Post
Quote:
Originally Posted by fletcher View Post
About to flush my trans/diff fluids and trying to find the appropriate OEM washer part numbers to replace them. I'm finding lots of differing info online and the FSM doesn't offer part numbers for washers <img src="https://www.iwsti.com/forums/images/smilies/frown.gif" border="0" alt="" title="Sad" class="inlineimg" />.

For both rear diff plug washers I have found 803920050 the right fit based off my research

For the Oil pan trans plug washer I found 803926090 and then for the clutch side plug washer I found 803916100. I'm confused about the filler plug washer but assumed 1 of 803918060 or 803926090 should be it.

If anyone can confirm these part numbers that would be incredibly helpful.

Thank you!
I found this on the Subaru parts website, which is also the same as my '16's fill plug gasket: Trans Fill Plug - 803918040

I think I have a post on here about torque specs in case you need them. What should i do?
I read your comment from the link. Are those the part numbers you used? And they all fit your 6 speed?
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Old 05-30-19, 12:18 PM   #4
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Default Re: 2011 STi Trans/Diff Plug Washers

i can vouch for raisingAnarchy's part numbers.

Those are the part numbers i used for my 2012 STI.

from his post:

Gaskets:
Clutch housing side drain plug - 803926090
Trans Fill Plug - 803918040
Trans drain plug - 803918060
Rear Diff Drain and Fill plugs - 803920050 (2 gaskets!)

Torque:
Clutch housing Torx T70 - 51.6 ftlb
Trans Oil pan drain/fill side - 36.9 ftlb
Rear diff drain/fill plugs - 44.3 ftlb


yup, the trans fill and trans drain uses two different gaskets, even tho they're the same bolt-plug (same part number).

If you're having difficulty or just want to see where the horse's mouth came from, you can goto parts.subaru.com and they'll have it listed there, easy to find.

i've linked my 2012 for reference:

parts diagram for rear diff **one is a drain bolt, the other is a combo thermostat/plug**:
DIFFERENTIAL (INDIVIDUAL).. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online

parts diagram to see the trans drain bolt/gasket
MT, TRANSMISSION CASE. CASE & OIL PAN.. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online

part where u can see the trans fill plug and gasket
MT, TRANSMISSION CASE. SWICH & PUMP COVER.. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online

part where u can see the clutch plug and gasket

MT, CLUTCH HOUSING.. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online


also to note for rear diff drain plug... u only need the gasket, no need for tube of gasket filler whatever its called. the FSM documents using a tube of gasket filler thingajigger, but that's only for the WRX. my local subaru shop used both, which made it suck for me cuz i had to clean that gunk out when i serviced my own diff fluids.

Last edited by crick0234; 05-30-19 at 12:23 PM.
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Old 05-30-19, 12:23 PM   #5
raisingAnarchy
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Default Re: 2011 STi Trans/Diff Plug Washers

Quote:
Originally Posted by fletcher View Post
I read your comment from the link. Are those the part numbers you used? And they all fit your 6 speed?
Yes I ended up ordering a few of each along with other parts from subarupartsdeal.com since they mark down OEM stuff. Still shows up in OEM sealed bags too. Way better than reading off a million numbers to the parts guy at the stealership too
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Old 05-30-19, 01:23 PM   #6
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Default Re: 2011 STi Trans/Diff Plug Washers

Quote:
Originally Posted by crick0234 View Post
i can vouch for raisingAnarchy's part numbers.

Those are the part numbers i used for my 2012 STI.

from his post:

Gaskets:
Clutch housing side drain plug - 803926090
Trans Fill Plug - 803918040
Trans drain plug - 803918060
Rear Diff Drain and Fill plugs - 803920050 (2 gaskets!)

Torque:
Clutch housing Torx T70 - 51.6 ftlb
Trans Oil pan drain/fill side - 36.9 ftlb
Rear diff drain/fill plugs - 44.3 ftlb


yup, the trans fill and trans drain uses two different gaskets, even tho they're the same bolt-plug (same part number).

If you're having difficulty or just want to see where the horse's mouth came from, you can goto parts.subaru.com and they'll have it listed there, easy to find.

i've linked my 2012 for reference:

parts diagram for rear diff **one is a drain bolt, the other is a combo thermostat/plug**:
DIFFERENTIAL (INDIVIDUAL).. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online

parts diagram to see the trans drain bolt/gasket
MT, TRANSMISSION CASE. CASE & OIL PAN.. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online

part where u can see the trans fill plug and gasket
MT, TRANSMISSION CASE. SWICH & PUMP COVER.. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online

part where u can see the clutch plug and gasket

MT, CLUTCH HOUSING.. For 2012 Subaru STI 2.5L TURBO 6MT 4WD WAGON | Subaru Parts Online


also to note for rear diff drain plug... u only need the gasket, no need for tube of gasket filler whatever its called. the FSM documents using a tube of gasket filler thingajigger, but that's only for the WRX. my local subaru shop used both, which made it suck for me cuz i had to clean that gunk out when i serviced my own diff fluids.
Thank you! I spent at least 2 hours on parts.subaru.com last night and kept finding differing results which just became increasingly frustrating. Good to know that you used the parts and on a relatively similar MY car too.
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