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Old 04-16-2012, 11:42 AM   #1
V3rtigo
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So, I've just completed swapping a 2005 usdm transmission and r180 rear end into a 2006 wrx and I would like to outline the process a little bit to highlight the gotchas that weren't clearly pointed out in other threads. Note I stayed 5x100 with the r180

Simple things that you may not consider
-The STI flywheel has 9 bolts to hold on the pressure plate, whereas the WRX only has 6. m8x1.25 bolt use the highest grade possible (grade 8 is oem)
-The subydave races that I bought do not fit onto the 2006 wrx axles. It appears that the newer axles are slightly thinner and have about 28 splines (stopped counting after 24) and the subydave races have 22. All of the tutorials on how to install these races use the older axles (2002 in most cases). I do not mean to badmouth subydave in anyway and I am sure the races work fine on the older axles and he does offer two different styles (21 or 22 spline).
-To solve my issue I bought 2008 legacy spec b axles (insert part #). These require you to use the wrx outer cv joint. This joint is removed from both styles of axles by removing the cv boot, clamping the shaft in a vice and hitting the race with a hammer until the cv joint comes off. Install is the opposite making sure the spring clip on the end of the axle goes into the cv joint correctly.
-The wrx transmission was stuck onto the engine and no amount of prying and beating would get it to come off. A simple butter knife wedged between the bellhousing and the engine on the top side separated the transmission easily.
-The Dust/inspection shield that covers the gap between the bottom of the transmission is different between the STi and WRX. The wrx shield sits closer to the flywheel. The sti pressure plate will hit this shield if you do not bend it out of the way or replace it with the sti shield (part number).


Install process (add later.)


I will be updating this post this week as i have time.
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Last edited by V3rtigo; 04-26-2012 at 02:24 PM.
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Old 04-16-2012, 11:43 AM   #2
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Parts Required to do the swap the same way as I did.
2004-2007 Sti 6 speed transmission(complete with shift fork, shift fork rod and slave cylinder)
2004-2007 Sti transmission cradle and mount
2004-2007 Sti r180 rear end(if 04-05 trans must use 04-05 r180, 06-07 trans must use 06-07 r180. The gearing changed in 06 and mixing newer and older will cause drivetrain failure)
2004-2007 Sti driveshaft (pretty sure all 4 years are the same)
2004-2007 Sti flywheel (should be resurfaced if used and the pilot bearing replaced)
2004-2007 Sti clutch, pressure plate and throwout bearing (your 2006-2007 wrx clutch will not work because it is a push instead of pull style) (additionally there are 3 more bolts that hold on the sti pressure plate than the wrx. Subaru dealers should have them in stock but you can use grade 8 bolts from a different place as well. The new bolts should be evenly spaced on the pressure plate because the new bolts will most likely not weigh exactly the same as the old ones and they will balance each other out then)
2008 Legacy spec b axles (have r180 inner and 5x100 outer but you need to swap your wrx outer for the spec b outer. The spec b outer will not fit nicely into the rear wrx hubs)


Fluids
5 QT transmission fluid (I used redline 75w90ns)
2 QT Rearend fluid (I used redline mt90)
1 QT Brake fluid dot3 or better (I used ATE Super Blue)

Last edited by V3rtigo; 04-26-2012 at 02:41 PM.
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Old 04-16-2012, 11:43 AM   #3
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reserved for future updates #2

Add credit/reference threads here

Last edited by V3rtigo; 04-26-2012 at 02:42 PM.
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Old 04-26-2012, 02:43 PM   #4
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Updated 4-26-2012
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Old 04-26-2012, 03:23 PM   #5
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You'll also need a different clutch slave cylinder.
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Old 04-26-2012, 03:28 PM   #6
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Quote:
Originally Posted by minifreak View Post
You'll also need a different clutch slave cylinder.
This is correct for the 2006-2007 as the wrx went to a push style clutch from a pull in 2006. It's noted next to the transmission on the parts list. Let me know if you find anything else missing.
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Old 05-12-2012, 02:12 AM   #7
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Lots of good info here. I am doing the same exact swap. 05 sti trans into an 06 WRX.

Ill do my swap based on your info. Still trying to find some used Spec B axles..I am not opposed to buying new..Do you know of any vendors that have them for less than $300 each?

I have a question. What did you do about the front axles? My 6MT setup came with STI front axles, not sure if I need to use them or not.
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Old 05-14-2012, 10:37 AM   #8
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Your front wrx axles will just work.

I got my spec b axles brand new from subaru. Call around to a few different dealers as I was quoted prices 300-450 per axle. Buying a non-subaru axle runs the risk of the spline not being the right count and thus the outer wrx cv will not fit.
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Old 05-18-2012, 10:16 AM   #9
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Please do not PM me about this. I am subscribed to this thread so I will be notified if you post here and then the information is viewable for all.
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Old 05-18-2012, 11:21 AM   #10
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Quote:
Originally Posted by V3rtigo View Post
-The subydave races that I bought do not fit onto the 2006 wrx axles. It appears that the newer axles are slightly thinner and have about 28 splines (stopped counting after 24) and the subydave races have 22. All of the tutorials on how to install these races use the older axles (2002 in most cases). I do not mean to badmouth subydave in anyway and I am sure the races work fine on the older axles and he does offer two different styles (21 or 22 spline).
-To solve my issue I bought 2008 legacy spec b axles (insert part #). These require you to use the wrx outer cv joint. This joint is removed from both styles of axles by removing the cv boot, clamping the shaft in a vice and hitting the race with a hammer until the cv joint comes off. Install is the opposite making sure the spring clip on the end of the axle goes into the cv joint correctly.
So, I'm not sure if you were simply making an informational statement or something else, which may be all you are doing, ie; "word to the wise" but Dave did clearly state on his website

Quote:
Originally Posted by http://wordpress.suberdave.com/?page_id=278
You must also use R160 shafts with 22 splines on the inner side of the shaft. From experience these can be found on 02+ WRX’s

21 spline races are also available.
As far as the 2008 legacy spec b axles are concerned, how well did those work? Anything I have seen has said that the legacy spec b axles are longer than the STi axles, and would be a problem
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Old 05-20-2012, 12:45 AM   #11
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Quote:
These require you to use the wrx outer cv joint. This joint is removed from both styles of axles by removing the cv boot, clamping the shaft in a vice and hitting the race with a hammer until the cv joint comes off. Install is the opposite making sure the spring clip on the end of the axle goes into the cv joint correctly.
He explained this above. To make sure the axles are the proper lengh, they need the WRX outver cv joints.
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Old 05-20-2012, 08:06 AM   #12
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Quote:
Originally Posted by Samurai Jack View Post
As far as the 2008 legacy spec b axles are concerned, how well did those work? Anything I have seen has said that the legacy spec b axles are longer than the STi axles, and would be a problem
I've run the Spec B axles w/ wrx outter cv joints now for 2 years, drag racing a few weekends each summer.
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Old 05-20-2012, 10:04 AM   #13
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So the 06 wrx axles will simply insert into the 05 sti trans without needing anything extra?
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Old 05-20-2012, 08:13 PM   #14
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Front ones will yes
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Old 08-17-2012, 06:24 PM   #15
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Any Updates?
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Old 08-17-2012, 06:40 PM   #16
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Quote:
Originally Posted by ggixxer599 View Post
Any Updates?
Anything in particular you need answered?
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Old 06-13-2013, 02:14 AM   #17
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im trying to do this same swap and thank you for pointing this stuff out.. really getting frustrated at it, cuz everytime i look something up i find something new i need to change.. im seriously glad i havent ordered anything yet.. so how much did this cost total? and the spec b axles.. you just do the same thing with those as suberdave does to the older axles? you use a spec b axle and then take the wrx joint that would go into the hub? sorry still a little confused.. like i said i read so much crap about it, its starting to blend together
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Old 06-13-2013, 03:10 AM   #18
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and also what race did you use.. kinda lost on that too.. the spec b one?
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Old 06-13-2013, 09:42 AM   #19
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Quote:
Originally Posted by SxVxH06 View Post
and also what race did you use.. kinda lost on that too.. the spec b one?
Its the wrx race. You just knock the entire outer wrx cv off and put it on the spec b shaft. Its much less involved because you don't have to tear apart the joint and swap the races like with the suberdave kit.

All you have to do is undo the clamps on the outer cv joints on both axles, slide the boots back enough that you can hit the races with a hammer, hit the races (hard, there are cir clips on the end of the shafts) to knock the cvs off the shafts, put the wrx cv on the spec b axle (put the clip back in the groove on the axle first) and button everything back up. Note this won't work with pre 2006 wrx axles ime as they have a lower spline count.


Code:
R180 -> spec b inner cv -> spec b shaft ->wrx outer cv
When I say cv that means the the cup, balls and race.

The spec b axles were $350 a piece from the dealer and I probably spent somewhere in the neighborhood of 4500 for everything but I got a deal on everything from a 05 sti with the exception of the rear axles and the new clutch I bought. You probably won't get out that cheap if you are doing an r180 in the rear.
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Old 06-13-2013, 09:55 AM   #20
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cool thanks.. i have a dude thes hooking me up with a complete 05 sti trans.
clutch, flywheel, driveline, rear diff etc etc for 2200 shipped.. lol i just cant pass up that deal considering im up in alaska..
i have an 06 wrx, broke some forks in my trans, did a partial rebuild and it broke again.
the shop wont warranty it because they "didnt touch that part" yet the whole trans was apart and all new synchros were replaced.. so i gave up with that transmisson and decided to go with the 6 speed =]
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Old 06-13-2013, 04:02 PM   #21
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seems simple enough and can be done in 1 day from morning till night with hour or so breaks inbetween.. i have the place and tools just needed to get the info straight before buys all the wrong stuff.. thanks again man, awesome thread much appreciated!
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Old 06-13-2013, 04:03 PM   #22
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buying*
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Old 06-15-2013, 03:34 AM   #23
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Also anything with the wiring harness??
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Old 06-17-2013, 09:24 AM   #24
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you have to take the 4 pin connector from the 5 speed trans and replace the 6 pin connector from the sti trans so that it will plug into the 5 speed harness. The wire match in color on both harnesses and there will be 2 extra wires for the dccd that you will either just leave not connected or run them to a dccd controller. I believe the wires are all green or black with different color stripes to differentiate them, so be careful that you don't mix up a green w/ white and a green w/ yellow.
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Old 06-17-2013, 04:05 PM   #25
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ok cool.. thank you. anyone have a step by step of transmission removal? i know its pretty easy but perfer to do it the right way instead of the "back yard" style.
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