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Old 03-02-2004, 09:52 AM   #1
DanZ
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Default Transmission filter

This is something I hear nothing about. But I was just at the dealer when they were talking to someone else about it. I just did my tranny oil change myself and was wondering when the tranny filter needs to be replaced? 60k?
-Dan
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Old 03-02-2004, 12:45 PM   #2
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According to Subaru the AT filter doesn't need to be changed unless the filter has physical damage or the transmission needs internal repares ie taken apart. Ed Hayes
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Old 03-02-2004, 04:09 PM   #3
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thanks for the reply Ed. I was asking the guy at the desk and said he's no tech, but he thought every 30k or 60k miles. I didn't think so. Thanks for clarifying.
-Dan
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Old 03-02-2004, 05:45 PM   #4
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Yep, I didn't listen on my old 90 Legacy and changed it anyway...
It's a metal screen mesh type filter, a pain to remove at least on that car, and didn't seem dirty at all with 100k miles on it.
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Old 03-02-2004, 08:20 PM   #5
North Ursalia
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The external filter is not meant to be replaced if you have one. The internal one is definitely supposed to be replaced. We do them every 60k miles (or 30k if requested) at the dealership. It certainly doesn't hurt to change the external filters anyway though.


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Old 03-03-2004, 12:33 AM   #6
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internal filter? where is that? is it benefitial to have it replaced at 30k even if everything is running sound? thanks Brian.
-Dan
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Old 03-03-2004, 01:57 AM   #7
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It's inside the pan. You change your oil and oil filter even though the car still runs OK, right ?


Brian

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Old 03-04-2004, 10:50 AM   #8
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Brian,

Is the internal trans filter only present in WRX/Impreza?

I own an 02 Legacy GT. The Subaru Service manual I have does not make a reference to an "internal" transmission filter, only the external one labeled "ATF Filter".

I had the dealer perform a trans fluid exchange at 30,000(dealer said I could wait until 60K, but I thought, why risk it? Fluid is cheap!)

If an internal filter was present in my Legacy, it was not changed at that point. If I have one, looks like I will be having tranny service again soon!

Thanks
Shane
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Old 03-04-2004, 11:01 AM   #9
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Sj72-

Nope . All 4EAT trannies have the internal filter, be it a 31728AA011 or a 31728AA050 (depends upon the year). Impreza, Forester, Legacy- doesn't matter, they all have one . Some don't have the external filter, but they all have an internal filter, which you will find if you pull off the pan.


Brian


Last edited by North Ursalia; 03-04-2004 at 11:09 AM.
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Old 03-04-2004, 11:29 AM   #10
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Brian,

Thanks. Hmmm..so if the dealer did'nt pull the pan at 30,000, am I safe until 60,000 to wait?

Just trying to determine the "panic factor" here. If it's best to go ahead and have them pull the pan and replace internal filter (I'm at 38000 now) I will do it.

Otherwise I will simply wait until 60,000 and the next fluid change.

Shane
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Old 03-04-2004, 12:33 PM   #11
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Well, we change them every 30k here. I'd honestly get it done.


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Old 03-04-2004, 12:41 PM   #12
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I thought this was going to be a "muffler bearings" thread -- I've never owned, nor do I know ANYTHING about automatics.

Tranny filter - heh - learn something new every day!
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Old 03-04-2004, 12:54 PM   #13
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Brian,

One last question. I checked the service invoice from the dealer, and it lists a part known as "Trans Kit", cost was about 18.50 for the kit.

Does that sound like a standard description for the internal filter and gasket for the pan?

Thanks again. Thought I was so smart, picked up a copy of the Subaru Service manual before I put the car in for dealer service, so that I could see what needed to be replaced for a trans service. Looks like the manual did not cover that portion.


I can always call the dealer I guess to find out if the internal filter was replaced.

Shane
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Old 03-04-2004, 04:02 PM   #14
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Cirrus, I don't think this has anything to do with automatic transmissions. I had a manual, and was referring to the oil filter for the tranny oil.
-Dan
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Old 03-04-2004, 06:08 PM   #15
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Shane-

Probably not. Even though some dealerships sell parts for certain services at a discount, they would have to sell the internal filter at well below cost to sell it that cheap. It was probably just a fancy way to charge you $18 for a few quarts of tranny fluid. When we do tranny flushes at the dealership, we end up putting in four quarts (what was in the pan and filter) of brand new fluid as well. The only good way to do a tranny flush IMHO is to drop the pan, replace the filter, and put in the new four quarts. It's not because that's the way that ends up costing the customer more, it's done that way because it's the way that helps ensure the longevity of a very expensive auto tranny .

DanZ, this has everything to do with automatic transmissions . Every Subaru since about 1974 with an auto tranny has had an internal filter for the ATF, and starting around 1999 they started using an additional external filter as well.


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Old 03-04-2004, 06:45 PM   #16
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well, more confusion then. when I started the thread, I meant filter for the gear oil tranny, not auto tranny. So, just to clarify: what do I need to replace on a manual transmission in a wrx other than oil every 30k?
thanks Brian
-Dan
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Old 03-04-2004, 07:00 PM   #17
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Are you asking if there is a gear oil filter for manuals? If so, no. There is not a front diff or rear diff filter either. I've never heard of a gear oil filter on any manual, although I'm not saying there aren't any. On a manual, just drain and fill, there's no filters to replace or anything else I can think of.

-Charles-
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Old 03-04-2004, 11:19 PM   #18
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Dan, Charles is 100% correct. Sorry for the confusion- when I hear "filter" and "tranny" I automatically think of an automatic . Thanks Charles !


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Old 03-05-2004, 12:15 AM   #19
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Thank you both. everything is clear - I am no longer worried
-Dan
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Old 03-05-2004, 12:14 PM   #20
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Quote:
Originally posted by ImprezaVA
Are you asking if there is a gear oil filter for manuals? If so, no. There is not a front diff or rear diff filter either. I've never heard of a gear oil filter on any manual, although I'm not saying there aren't any. On a manual, just drain and fill, there's no filters to replace or anything else I can think of.

-Charles-
Thanks guys - Again, I don't claim to be anybody smart when it comes to cars, but my whole life has been around manual tranny's - mom has a 22 year old Volvo manual, dad had various subaru's all 5spds (I inhertited the impreza), and now with my impreza, I just never even knew there was such a thing!

thanks!
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Old 03-10-2004, 03:59 PM   #21
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Brian,

I have searched this forum, and searched the Subaru Service Manual that I have(20.00 for 72 hour download deal), and I cannot find a procedure for removing the transmission oil pan, replacing filter, and then reinstalling the pan.

Does anyone have a link/info on this?

I know the ATF drain is a sinch, remove the bolt etc.

Is removing the pan a tedious/difficult job?

I planned to do it myself if possible to avoid extra $$$ at the dealer.

Shane
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Old 03-10-2004, 08:45 PM   #22
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Removing the pan is a cinch also. Removing the internal filter and getting the new on is the hard part. All you need to do is remove the 2 bolts that hold that little tube in. Once your in there you'll see exactly what I'm talking about. They say the internal filter doesn't ever need to be replaced, but I replaced mine anyway.

Legacy777 provided this picture of the tube and bolts that need to be removed: http://forums.nasioc.com/forums/show...ghlight=filter

In 1998 Subaru used silicon to seal the pan to the tranny (auto), so I assume they still use this instead of RTV. Nonetheless, good luck.

-Charles-
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Old 03-12-2004, 12:53 PM   #23
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Thanks ImprezaVA!

Based on what I read in that post, I may simply drain ATF, drop the pan and clean the magnet and clean the screen filter, since it looks like I can simply clean the internal filter.

Regarding gasket,
Yeah I see I need ThreeBond 1217B(also known as Fuji C) sealer for the pan. Is there also a rubber gasket part that fits between the pan and the transmission housing? Or does Subaru simply use the ThreeBond material as a sealer?

I found a service manual reference to removing the pan at

http://206.13.93.15/STi_Stuff/STi_Ma...lve%20Body.pdf

It looks like in this section that you remove the gasket and discard, and then replace using ThreeBond?


Thanks
Shane
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Old 03-12-2004, 12:56 PM   #24
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One other thing..anything tricky about reinstalling the pan with the sealer?

I figure I would reinstall the pan and then wait 24 + hours before refilling with ATF, to give the sealer time to dry.

May seem like I am being picky about this, just don't want to get the pan off and then have trouble resealing, trans leaks, etc.

Thanks
Shane
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Old 03-12-2004, 02:03 PM   #25
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Transmission center's don't wait 24 hours before adding the ATF and letting the customer leave in their car. I don't think the Tranny place I went to even used Threebond, just silicon and mine isn't leaking.

Just be sure to clean the old silicon, threebond, whatever, off of the pan's sealing surface. As far as anything being tricky, I would put a dab in the bolt holes of the pan to keep it from leaking. Just run a 1/4" bead all the way around the pan mating surface and put a little in the bolt holes.

I'm not saying there aren't any gaskets for the auto tranny pan, but I haven't seen any, but nor have I looked. Having a second set of hands will help keep the sealer from being smeared and will allow you to put the bolts in easier. However, this isn't necessary because the pan is not that big and most people do it by themselves. Lastly, do you know the torque specs for the bolts and the tightening pattern? Get this info to keep from kinking the pan, say from tightening the bolts like -->|<--- if that makes sense. Usually start in the top middle, then tighten the bottom middle, and work your way out <--|-->. I'm sure this info is out there, but I'm at work now so I don't have time to search it up. Good luck.

-Charles-
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