Tranny Swap - Subaru WRX Forum
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post #1 of 25 Old 01-25-2014, 06:01 PM Thread Starter
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Tranny Swap

I am going to look into getting an STI trans.
What years would fit in my car?

P.S. Looking for an STI trans is anyone knows let me know, could be blown doesnt matter, going to build it anyways
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post #2 of 25 Old 01-25-2014, 07:10 PM
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Wow! Stupid, why didn't you just buy an STI in the first place.
Don't mean to come off too harsh, but I've read your build thread. Looks like you should have just bought one of those.
I also saw that you're "sponsored", if it's a legit sponsor, they'll she'll out for it. Or should.
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post #3 of 25 Old 01-25-2014, 07:37 PM
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Whaoo Riceburner, chill out. First off, not everyone can afford the newer gen (08+) STi's and it's actually cheaper to get the WRX and Swap in a STi Transmission.
Also not every sponsor will just go out and shell out money for your mod's.
In all honesty you are calling him stupid, when in reality your making yourself look that way.

To the OP. I believe any STi Drivetrain 08+ will match up.
I also am looking to go STi Trans once I buy my Built Block (After I reach 320-350whp)
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post #4 of 25 Old 01-25-2014, 07:51 PM
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What happened there.
Like a famous man named Joey once said.... Whoa!!!
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post #5 of 25 Old 01-25-2014, 11:06 PM Thread Starter
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RiceBurner, get off this forum and go to nasioc where you belong, this isn't a place for your crap! Also it's called built not bought!

And exactly as sub14wrx said things didn't happen at the time where I have the money to buy an Sti that was a newer gen.

So anything 08+ should fit?
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post #6 of 25 Old 01-26-2014, 08:44 AM
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Yes with the help of other items it will bolt in.

Here is what I found on Google, could have found it here using the search button too.
Xoxoxo
STi's 6-speed a good upgrade over the WRX?

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post #7 of 25 Old 01-26-2014, 08:56 AM
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This swap done right is still going to cost you the 10 you didn't have before though Nate.
It's going to cost you more than buying an STi over the Wrx too.
So I understand where rice burner is coming from.
Think about it. You'll have the tranny in the Wrx at the 32-36k cost.
But still won't have the other STi goodies.
So if you go to a full STi parts swap, it will probably run around 40k.

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post #8 of 25 Old 01-26-2014, 09:35 AM
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If you look hard enough you can get the transmission cheap and still in great condition. Just have to find the right spots.
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post #9 of 25 Old 01-26-2014, 09:42 AM
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2008 Subaru Impreza WRX STI 6 Speed Transmission Differential TY856UW1MA 42K | eBay

$4,000 comes with trans, rear dif, shifter assembly.
I don't know if you'd need anything else.
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post #10 of 25 Old 01-26-2014, 09:44 AM
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This is for guys that have a wrx and wants to do a 6-speed swap.



I know there is a large number of swaps that have been done with all kinds of year and there are some differences with each. I just think with a superior design the Sti transmission is a great option for those needing something that can hold some more power. While it may not be indestructible, it is still a HUGE improvement over the WRX 5 speed glass box. Other upgrades include the RA gear set for mild power, M-Factory, MTR gears, Kaz gears and of course PPG gears. There are a fantastic selection of products not only for the WRX 5 speed but also for the Sti 6 speed available from a variety of companies. . So here goes:

04 USDM Sti 6 speed:
-transmission
-driveshaft from an automatic or from Sti with a yolk for a wrx
-3.90 R&P gear to replace the 3.54 in the WRX
OR
-R180 rear differential and Sti hubs, rotors, brakes and axles*
-6 speed shifter and assembly****
-front axles and hubs can be reused provided the transmission still has the axle stubs in it.
-DCCD controller optional but recommended**
-6-speed clutch fork and slave cylinder?
-5speed or 6 speed flywheel and clutch

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 0.971
6th - 0.756

04 JDM Sti 6 speed:
-transmission
-driveshaft again
-3.90 R&P gear to replace the 3.54 in the WRX
OR
-R180 rear differential and Sti hubs, rotors, brakes and axles*
-6 speed shifter and assembly****
-front axles can be reused if it has stubs in the transmission?
-some seem to be DCCD and others non-DCCD with Viscous LSD
-6-speed clutch fork and slave cylinder?
-5 speed or 6 speed clutch and flywheel

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.062
6th - 0.842
Final - 3.900

05 USDM Sti 6 speed:
-transmission
-driveshaft
-3.90 R&P gear to replace the 3.54 in the WRX
OR
-R180 rear differential and Sti hubs, rotors, brakes and axles*
-6 speed shifter and assembly****
-hubs or Stubs? Not clear on this one for the front but it seems there is extra that needs to be done with an 05***
-DCCD controller optional but recommended**
-6-speed clutch fork and slave cylinder?
-5 speed or 6 speed clutch and flywheel

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 0.971
6th - 0.756

05 JDM Sti 6 speed:
-transmission
-driveshaft
-3.90 R&P gear to replace the 3.54 in the WRX
OR
-R180 rear differential and Sti hubs, rotors, brakes and axles*
-6 speed shifter and assembly****
-hubs or Stubs? Possible using 03-04 stubs could work with the correct clip and seal like the 2006 tranny and then reuse wrx axles***
-Again not clear, but seems some come without DCCD**
-6-speed clutch fork and slave cylinder?
-5 speed or 6 speed clutch and flywheel

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.062
6th - 0.842
Final - 3.900

06 USDM Sti 6 speed:
-transmission
-driveshaft
-Stock R160 can be used without changing the gear ratio due to change in 06 that makes the ceneter diff a 1.1:1 vs the old 1.0:1
-stock rear axles can be used on rear due to no need to change the rear diff
-front...04 Sti Axle stubs can be ordered along with seals and clips that retains the WRX front Axles, hubs, etc? Special seals are needed. Axle Stub Part Number: 38415AA110
Circlip Part Number: 805329010 from Wrinkleboi's thread about this***
-6 speed shifter and assembly****
-DCCD controller optional**
-6-speed clutch fork and slave cylinder?
-5 speed and 6 speed clutch and flywheel

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 0.971
6th - 0.756

06 JDM Sti 6 speed: into wrx
-transmission
-driveshaft
-6 speed shifter and assembly****
-6-speed clutch fork and slave cylinder for 2007 sti
R160 rear diff (02-05 wrx)
6 speed clutch and flywheel
Circlips from 2004 sti, oil seals and axle stubs

1st - 3.636
2nd - 2.375
3rd - 1.761
4th - 1.346
5th - 1.062
6th - 0.842
Final - 3.900

07 USDM Sti 6 speed: into wrx
-transmission
-driveshaft
-6 speed shifter and assembly****
-6-speed clutch fork and slave cylinder for 2007 sti
R160 rear diff (02-05 wrx)
6 speed clutch and flywheel
Circlips from 2004 sti, oil seals and axle stubs

1st: 3.636
2nd: 2.375
3rd: 1.521
4th:1.137
5th:0.971
6th: 0.756
reverse - 3.545
final drive ratio - 3.90

JDM 07 Sti 6 speed

-transmission
-driveshaft
-6 speed shifter and assembly****
-6-speed clutch fork and slave cylinder?
-no clue
-no clue
-no clue

unknown ratios.


*For those wanting to use the R180 but not switch out the hubs, Apparently driveshaftshop.com offers custom axles (pricey) that allow you to retain the wrx hubs while using the R180 rear end.

** DCCD controller options...seems a member on here Spider? is making one for around $150, others go up from there. Without going to an Sti ECU it does not appear to be able to be used as a fully automatic setting, but Spiider's and the Neetronic units seem to get close. Then there is the 100% lock up with a toggle switch. I am unsure as to how soon this could kill the DCCD, but who knows it could last forever! Some sites with controllers:
Home
GEMS - General Engine Management Systems Ltd - Performance Electronic Systems
www.rocketrally.com - Rocket Rally
MoTeC
DCCDPro.com

*** There may be a difference between the 05 axles and the 02-04 axles on the WRX. There may have been a change to the axle and some 05 wrx might be able to use their stock axles. I have not verified this, just read some threads suggesting it.

****The shifter boot is suggested, but not necessarily an absolute must. The old shift boot can be reused with some modification and work. Shift knob is the same, it can be reused if necessary, but not the best option. Thread about this located here see post #66.

Parts and numbers for some of the parts:

32000-AJ350 2007 STi transmission
805329010 Circlips need 2
38415AA110 stubs need 2
806730041 oil seal Left and right side are different
806730042 oil seal Left and right are different
C1010FE004 short shifter
35046FE010 -shifter joint
633046020-spring pin



Ok guys im currently doing an 08 sti trans swap into my 02 wrx. Ive searched alot for alot of questions about the differences between the 04 to 07 trans and the 08+ - some i have found and some i still have yet to find. So i figure id start a new thread about the new 08+ transmissions. If anyone has any info to add please do and i will update this.

------------------------------------------------------------------------------------------------------

LIST OF NEEDED PARTS TO SWAP AN 08 6 SPEED INTO A WRX

Trans - duh
Driveshaft
-04 to 07 are direct fit
-08 can be used - it must be shortened - read below vvvv
Axle stubs, seals, and circlips to reuse your front wrx axles
-can also use 04 to 07 sti axles if you have the supporting hubs*** - 08 axles are too long i believe
6 speed clutch, flywheel, and fork
- 5 speed clutch and flywheel will NOT work - i tried
Can reuse all the rear end driveline if it is a wrx with a 3.54 rear end (02 to 04?) i believe
- If 05 wrx and up (other than 3.54 rear) you will either need to:
- swap to a 3.54 rear diff
- swap out your ring and pinion
- swap to the sti (06? and up) rear end (3.54)
- this one will require in the rear the sti axles, hubs, brembos, and rear sti suspension assy
Linkage form an 04 to 07 sti - this is the easiest - buy one
- the 08 one may be able to made fit but it will require extensive shortening and *may* throw off your shifter position - dont be cheap
08 trans mount and support works just fine
slave cylinder and starter can be reused

**** ALSO - VERY IMPORTANT****
After completing the swap and if you plan on running without any sort of speed sense signal input to your ecu (aka speedo reads 0mph all the time), you must reflash the ecu to disable the code and the rev limiter. Since there is no speed input, the ecu thinks that the car is standing still and it employs a rev limiter for "neutral mode" which means that you wont be able to rev over 5k. If you are fluent with romraider then im sure you can take care of it, if not see your local tuner and let them do it. The obd code for the "vehicle speed sensor A" must be disabled along with the "neutral rev limiter". This is in a different catagory - i believe its in the limits catagory. Again - these two must be disabled and reflash the ecu if you plan on driving the car without a speed input.

I think thats it - please let me know if I forgot something
------------------------------------------------------------------------------------------------------

1. What are the diff ratios in the 08+ transmissions?

The diff ratios are unchanged from 2007 - thanks to dylan @ DS1. It runs a 3.90 in the front and a 3.54 in the rear which yields a 1.1 center. Strait swap into the bugeye wrx if you dont plan to swap the rear diff right away.

2. Are there any changes to the gear ratios from 07?

I have yet to find a subaru transmission chart with the 08 specs on it but another member on here has found some info about the internals in the 08 sti transmissions. as far as he can see there are some changes to small things but the ratios appear to be the same. here is the link - http://forums.nasioc.com/forums/show....php?t=1443215

3. Are there any changes to the housing or overall case size?

No it is still the same overall size as previous years.

4. Are there any changes to the wheelbase length in 08 to affect the driveshaft length?

Yes - Ive found that from 02 to 07 the wheelbase length is 100 inches. In 2008 it was LENGTHENED to 103.3 inches. This will explain why my 02 wrx 5 speed ds and the 08 sti ds are the same IDENTICAL length when laid next to each other. The 08 sti ds can be made to work - it needs to be shortened vvv.

5. Can an 04 to 07 sti driveshaft be used with an 08 sti tranny?

Yes - you will need to find a ds from an 04 to 07 sti or from an automatic impreza.

****** Also - If you are in my place where the 08 driveshaft that came with your 08 trans is in super awesome shape and you dont wanna risk paying good money for someone elses ds that you dont know what condition the u joints are in, the 08 ds can be shortened and made to fit. If you decide to shorten your 08 sti ds -
**** the front half must be shortened 3 inches and the back half must be shortened 0.5 inches****
You must also modify the center bearing bracket cause it is a slightly different shape in 08. the drivers side of the bracket must be "bent" so that it is higher than the passenger side - if you look at the mounting holes you will understand. in 08 the centerbearing bracket is nearly flat.

6. Can the 08 shifter assy be used in an earlier model when doing a swap?

No - The shifter linkage along with the brace bar underneath are too long. It seems that the hole cut under the center colsole for the shifter assy has been moved backwards in 08 to cause the linkages to be longer. You will need an sti shifter assy from an 04 to 07.

7. When doing a swap to a wrx with female front axles, can the same axle stubs and seals be used as if it was an 07 trans?

Yes - I installed the seals and stubs with circlips in the trans and all went smooth and looks good.

805329010 - Circlips x2
38415AA110 - Stubs - x2
806730041 - Oil seal left
806730042 - Oil seal right
633046020 - Spring pin x2

8. Are there any changes to the trans fluid and rear diff fluids needed?

No - I contacted the dealer on this. The dealer told me they use valvoline 80w90 in the trans and the house blend subaru lsd oil in the rear diff.

9. The 08 trans doesnt have a dipstick anymore?????

True - there is a plug where the dipstick should be. the filling process is to open both plugs underneath and let it drain completely, then fill is with the specified amount of oil - which i believe is 4.3 qts per the dealer. Also the dealer will tell you that after you put in your 4.3 qts, the level should be near the hole where you can touch it by sticking your finger in there - WRONG!!!! After 7 qts i was able to see the level in the hole with a light and it was still about 4 to 5 inches below the hole! There is a second plug on the driver side of the trans near the front that when it is opened and 4.5 qts is poured in, the oil level will be level with this hole. There is an illustration in the link below.

**** It seems that Deuce Cam has found an 08 tranny diagram and filling procedure on another site ---> Subaru Impreza WRX STI Forums: IWSTI.com - The Largest Subaru STi Specific Forum in the World!
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post #11 of 25 Old 01-26-2014, 09:46 AM
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^ got that from slcsubaru
Most of that info came from nasioc originally.
I just read, copied and pasted
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post #12 of 25 Old 01-26-2014, 09:56 AM
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Prob cheaper to just go PPG Internals on the 5 Speed.
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post #13 of 25 Old 01-26-2014, 12:30 PM Thread Starter
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Biggest issue keeping the 5speed wrx trans is that you have a lot more case flex over the Sti trans

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post #14 of 25 Old 01-26-2014, 12:53 PM
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Are you looking to track hard or rally Nathan?

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post #15 of 25 Old 01-26-2014, 02:58 PM
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Don't forget.
Axles, hubs and mounts- group N or better.
There's another easy grand

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