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Old 01-23-2009, 02:03 PM   #1
Bad Noodle
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Default 04 sti tranny --> 07 wrx - new seals or axles?

Going to be putting in a 04 sti tranny into an 07 wrx. The 07 wrx has the male front axles while the sti tranny has the axle stubs for female front axels.

So can I take out the axle stubs and remove the seals, then put in new seals and resuse my male axles? If so what seals/clips?

or do I need to find female front axles? If so, will I need wagon specific axles?



I read the faq a couple of times and am still not sure
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Old 01-23-2009, 11:38 PM   #2
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looks like I need the axles... do I need wagon specific ones or the sedan ones?
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Old 01-24-2009, 03:54 AM   #3
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It would probably be easier to just find 02-early04 female wagon axles.

The early 04 STi transmissions have strange front differential side covers on them. They are different than the newer ones do. To convert to newer male axles. You need to remove the stubs and change the seals. The stubs will pop right out. But when you go to pull the seals out they will not pull out of the diff side covers. There is a little lip that holds the seal in. The differential covers must be removed and the seals can be removed from the inside of the covers. Then when you put the covers back on the backlash on the front ring and pinion must be reset. This can be costly. I ran into this problem with my JDM V8 Spec C 6mt with subbed axles, when I went to change out the seals for a new set of stub type to replace the leaking old ones.

With the early 04 diff covers either seal will fit. Stub type seal have to be removed and installed from the inside. Stubless seals can be removed and installed from the outside.

With late 04+ diff covers, either seal will fit also. Both stub and stubless type of seal can be removed and installed from the outside.
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Old 01-24-2009, 07:13 AM   #4
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^ wow thanks for the knowledge

Is there any way to tell which diff cover the tranny has? (early 04 or late 04 ?)
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Old 01-24-2009, 01:57 PM   #5
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If you have to take the differential covers off to change the axle seals you have the early style. thats what I have. there is no way that I am aware of to use male axles with this set up. The axles just dont click in properly. You have to use 04 sti stubs and any sort of applicable female axle. You may be able to convert the diff cover to the latter style but I have not looked into that. Best just to go with the female axle set up.

It is not possible to convert the older style sti trans to male axles by simply just changing the seals and removing the stubs. The carriers themselves are different and they just dont fit properly. I have changed the axle seals in my trans twice in one week due to leaks. I called DS1 and Dylan told me to use STI stubs and 04 sti axle seals. Hopefully that saves you a headache... and anyone else who may read this.
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Old 01-25-2009, 07:42 PM   #6
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Well. now I'm confused... really confused.

Here's the 04 sti tranny


compared to an 07 wrx tranny side shot:


So it looks like the sti tranny has an extra lip. Unless that comes out, I have no idea how I could get my axles in there.

So could those just be some kinda covers and I mistaked them for studs? The tranny is full of fluid right now, so if I remove the plastic clear covers the blue tranny fluid runs out.

The tuner told me that I can just replace the seals and use my 07 axels. But what you guys are telling me I can't. So I dunno what's going on

Last edited by Bad Noodle; 01-25-2009 at 09:04 PM.
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Old 01-25-2009, 09:00 PM   #7
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here's a better description of what I'm worried about:
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Old 01-26-2009, 12:04 AM   #8
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Like somone else and I have said, if you cannot pull your axle seals out from the outside and you have to take the diff cover off then your only option is to use stubs. 04 sti stubs and 04 sti seals. Things do not line up properly on this specific trans that would be interchangable on the latter models.
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Old 01-26-2009, 02:44 AM   #9
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It looks like it's an early 04 transmission and someone just robbed the stubs out of it.

So you already changed the seals to male axle type? How did you get the old ones out?

You are probably going to end up having to get a set of stubs, sub seals(unless you haven't removed yours), clips, and roll pins from the dealer and finding a set of 02-early 04 wagon front axles.
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Old 01-26-2009, 07:04 AM   #10
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I have no idea how the axle stubs cam out.

In the FS thread, in the pics, the tranny had the stubs in it. I picked it up and it had white caps where the axles are, so I though it was just a grease cover.

When I took a closer look after I got it home, I pulled out the white cover, and saw just a hole, no axle stub.




So should I be worried about this? Could any pins or clips be swimming in the tranny somewhere?
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Old 01-26-2009, 07:16 AM   #11
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Make sure before you take one side of the diff cover off in the event that you do(ie change axle seal)... that you have a stub in one side to help things stay lined up. There is a thread about replacing those axle seals around here some where. Mark your diff cover with white out so you know where it was clocked, and count the turns out. You shouldnt have any thing swimming around in there, the stubs clip in just like axles, and the roll pins go through the external portion of the stub.
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Old 01-26-2009, 07:27 AM   #12
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^ i don't wanna take the seals out, don't wanna mess with that. The seals are still in and I think I can reuse them. I was planning on getting the stubs and clips, and just throwing them in there. Then getting a set of female wrx wagon axles and calling it done.
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Old 01-26-2009, 11:00 AM   #13
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Quote:
Originally Posted by Bad Noodle View Post
^ i don't wanna take the seals out, don't wanna mess with that. The seals are still in and I think I can reuse them. I was planning on getting the stubs and clips, and just throwing them in there. Then getting a set of female wrx wagon axles and calling it done.
Yep, that's your best option.
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Old 01-26-2009, 04:12 PM   #14
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There's plenty of threads with the part numbers for the stubs and clips, but if you couldn't find them:

Axle Stub Part Number: 38415AA110
Circlip Part Number: 805329010

You need 2 of each and the total should be around $100.
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Old 01-30-2009, 10:11 PM   #15
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So, I just finished up getting my 04 tranny in, which was sold to me as a late-04 that used male axles.

Long story short, it wasn't... it was a de-stubbed early 04....

Anyway, I measured everything, then looked on here and checked out all the options. I decided to remove the backlash plates and have them machined to accept the male axles. If it works, it's much cheaper, quicker, and less hassle.

Got it all done tonight, popped in the new seals and put the plates back on. The axles went in great, and snapped in perfectly. The collar on the axle is inside the outer lip on the plate, but not rubbing the inside or anything.

Hopefully tomorrow I will get it fired up and get a definite result on this conversion.

Last edited by fujiillin; 01-30-2009 at 10:17 PM.
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Old 01-30-2009, 10:35 PM   #16
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^ wow, congrats on the custome work. I don't wanna get that crazy.

I managed to pick up a set of male axles, but they're for a sedan. I'm not sure they'll fit though
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