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Old 01-23-2016, 03:38 PM   #1
odie404
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Member#: 418210
Join Date: Apr 2015
Location: DuBois, Pennsylvania
Vehicle:
2004 WRX Wagon
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Question 06 STi 6 speed tranny into 04 WRX wagon

Hey guys. I recently picked up a 2006 STi trans package for my 04 wrx wagon due to blowing 2nd gear. Figured why not save for a couple months and snag a 6 speed. Now ive read all the 6 speed swap threads i could find and just wanna know if im gonna have any trouble throwing it in a wagon. I found one thread about a wagon with a 6 speed but couldnt find any answers to my questions. I heard somewhere that i might have trouble with axles due to length? If anyone has any input it would be appreciated.

In the 2006 package i received:
Trans
Shifter/linkage
trans mount
axles
hubs
driveshaft
r180 rear diff
clutch
flywheel
sti clutch fork

Another question. Is there any way to not have to buy the brembos but keep my wheels rotors and brakes? I know of hybrid axles but just wondering if there is another way to make it possible.

Anyone that has installed a 6 speed in a wagon please let me know if you had any issues with installation and what you did to fix it/make it work. Thanks guys
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Old 01-25-2016, 08:24 AM   #2
kenliu84
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Member#: 107618
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2006 OBP WRX Wagon
PrecisionTuned/TiCSuspen.

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Your suspension and wheels will not work on the hubs. Your suspension is based on the 5x100 pattern but the hubs you purchased in the kit are 5x114. The axles are also longer than the wagon ones so there is a difference in your front control arm width and the axle width.

When I put in an 07 STi trans into my wagon, I purchased an automatic trans driveshaft and 02-05 rear diff (to match the gearing). That was the main part of the swap so that I could use my current suspension and wheels. There were other components but I don't want to mention them as I can't remember the purpose behind them. I hate filling up the forums with guessing information.

If I were you, I would just research a little more to see how people did a full swap. In terms of long term reliability, that may be the best way to go. Trust me, you can't find replacement rear wagon axles anywhere. It seems as long as you can find a good set of STI suspension, wheels and brakes, you should be good but I know that's a lot of money. But hey, if your suspension is old, you would have to replace it eventually so you might as well do it now. Look into the control arm width issue; you may or may not be ok.

Other things:
Hubs - you might has well put new wheel bearings in them as well before bolting them on - that way you know everything is good to go.
Flywheel - have a shop resurface it.
Clutch fork - inspect it for signs of wear, esp. where the 'ball socket' is
R180 rear diff - replace the axle seals
shift linkage - upgrade the bushings, look into TIC

The "other things" I mentioned above is just my personal preference. I'm a little anal about stuff like that so don't think it is a must.

Last edited by kenliu84; 01-25-2016 at 08:30 AM.
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Old 01-25-2016, 10:40 AM   #3
odie404
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@kenliu84
I appreciate the reply man! I had my motor built at the end of summer and had all my stuff at the machine shop so the flywheel is good to go. Included in my swap i do get the whole rear suspension! Actually I have to go back down to get the rear suspension because they left it bolted together and i brought a car down to pick everything up. The guy informed me i could keep my 17 in wheels if i bought wheel adapters which im considering. At least to get the car moving until i save the money for new wheels. I think im just gonna get the rear brembos and make everything work. So you're using the r160 diff? I was told that it would blow to pieces in 6mo/1yr. How's yours holding up?
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Old 01-25-2016, 11:02 AM   #4
kenliu84
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Member#: 107618
Join Date: Feb 2006
Chapter/Region: Tri-State
Location: NY
Vehicle:
2006 OBP WRX Wagon
PrecisionTuned/TiCSuspen.

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It's holding up fine. 1 track event and 3 years - still going strong. I guess it all depends on what you're going with your car and how you will drive it.

Rear suspension only? What about the front?

I wouldn't go on the wheel adapters for too long. Good luck with your swap.
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Old 01-25-2016, 11:59 AM   #5
odie404
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Join Date: Apr 2015
Location: DuBois, Pennsylvania
Vehicle:
2004 WRX Wagon
Silver

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From what I've read i only need oil seals circlips and stubs to make my female axles work and the rest of the front is fine. I originally was gonna keep the r160 and get an auto driveshaft but the guy down where i picked up the trans from was telling me the r160 wouldn't hold up too long.. But as far as how i drive the car.. never been launched or drag raced or any of that. Daily driver, some pulls here and there and giving friends rides. Looking to go for 400whp now that i have the motor and trans to do so. But thats down the road. Thanks for your help!
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Old 02-03-2016, 12:52 PM   #6
Samurai Jack
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Couple of things I didn't see in your 2006 package:
- front and rear knuckles
- struts

Your 04 front struts will not fit your 06 STi front knuckles, if you got them in the package. The attachment points are different

Maybe this is what you meant when you said "Hubs"?
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Old 02-03-2016, 02:22 PM   #7
scby rex
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Location: copperas cove
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aw, MPS 2.34 breaking in

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Instead of putting male axle stubs in the 6mt, just spend the extra $100 and put the superior male sti axles in. If your using the whole rear you should just save a little more and swap the front knuckles/hubs struts too. There's HUGE benefit going to the bolt on hubs, plus you won't need dualndrilled wheels to rotate tires with the mismatch hubs.
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