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Old 03-24-2003, 10:14 AM   #1
Kha0S
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Member#: 8808
Join Date: Jul 2001
Chapter/Region: NESIC
Location: Grantham, NH
Vehicle:
2011 WRX (DGM 5D)
2002 WRX/2003 SVTF

Exclamation Call to arms: 4EAT to 5MT transmission swap (WRX)

Welp, for those of you who may not have heard, something (probably the oil pump) failed in my transmission towards the end of February. As a result, my transmission refuses to go into gear, and is generally broken.

Subaru has denied any coverage, and there are no remanufactured transmissions available. Parts/labor to repair the transmission (if even possible) would be deep into the thousands of dollars, and it'd all just be prone to failure once again.

So, I'm taking the plunge. It's my plan to do a complete swap of a 5MT transmission into my WRX. Yes, I know it'd be easier to sell the car, buy a new one, etc. But, with a lot of miles on the odometer, I'd have to get the Vaseline out on a trade-in with damaged goods.

So, here's the initial plan, that I've cobbled together from bits and pieces so far.

WRX 4EAT is a 4.111 box. Short propshaft (similar to/same as 6MT shaft).

I've got a line on a Legacy Turbo transmission through Darshu. It's a 3.9 box. Uses a longer propshaft than what I have.

The Legacy transmission has the shift linkage, shifter, clutch, pressure plate, and flywheel currently attached.

As far as I know, the Legacy Turbo transmission has a pull-type hydraulic clutch.

So, first off -- the estimated parts list:

- Transmission, shift linkage, shifter, clutch, pressure plate, flywheel
- Pedal box (including gas/brake/clutch pedals) (from any MT WRX)
- Clutch master cylinder (also from MT WRX or Legacy Turbo ?)
- Propshaft (any 5MT Impreza)
- Rear differential (3.9 LSD unit from Legacy Turbo, or from Subaru reman)
- Clutch hydraulic lines

... looks simple, right?

So, here are the major questions so far ... if you know the answer, please reply here and give it to me. If you just have a vague clue, it won't help.

- Will the longer propshaft from a 5MT Impreza swap into the Legacy Turbo extension case?
- Will the longer propshaft from a 5MT Impreza mate up happily with the 3.9 rear LSD from a Legacy Turbo?
- Will swapping the 3.9 LSD rear end into the place of my current 4.111 rear end require replacement of the axles and/or hubs?
- Will the front axles mate up properly with the front differential in the Legacy Turbo 5MT?
- Will all the splines line up?
- What are the weight/tooth pattern differences between the Legacy Turbo flywheel and a WRX flywheel? Will the Legacy Turbo flywheel bolt up to the EJ20 without complaint?
- Will the tooth pattern on any flywheel match up with the starter that currently spins my torque converter?
- What are the gear ratio differences between the Legacy Turbo 5MT and a WRX 5MT?
- Will my ECU cope reasonably with a missing TCU? Do I need a new ECU?

............

And now, the call to arms.

Anyone with parts, expertise, skills, and, most importantly, garage space in/around southern NH... please, please let me know. I'm going to need all of the above to get this done.

Thanks, all...

/Andrew

(edits:

Legacy Turbo appears to use a pull-type hydraulic, but this is still identical to the WRX.
)
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Last edited by Kha0S; 03-24-2003 at 10:46 AM.
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Old 03-24-2003, 10:32 AM   #2
subarurabbit
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Wayne needed Legacy Turbo axles for his LSD converions - so this is likely for you as well.

input flange was different.

more info here: http://wac.addr.com/auto/obs/lsd/lsd.html

gear ratios are identical to WRX gear ratios.

the transfer case gear ratio is 1:1 for a legacy turbo; WRX is 1.1:1.

Many companies list the same lightned flywheel p/n for a Legacy Turbo as a WRX. This should be ok.

DLC did a 5spd swap from a 4EAT on his Legacy Turbo Wagon and need a new starter too. You'll probably need one too.

http://www.xmission.com/~dac/library...on/convert.htm

I don't know about axle lengths - I'll get the track info on Turbo Legacy during lunch. WRX is a wider track up front - so WRX axles may work.
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Old 03-24-2003, 10:40 AM   #3
Thug
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I think you will likely need an ECU as well.
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Old 03-24-2003, 10:47 AM   #4
subarurabbit
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iirc,

the mechanism and function book says that the Automatic speedo gear puts out a different signal than the manual.
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Old 03-24-2003, 11:10 AM   #5
Legacy777
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You should be able to snip the AT/MT identifier wire going to the transmission. Doing that will let the ECU know to adjust things for manual tranny.

That's what Dave ended up doing on his.
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Old 03-24-2003, 03:02 PM   #6
Kha0S
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2002 WRX/2003 SVTF

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*koff*koff*


---kabump!---


/Andrew
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Old 03-24-2003, 03:05 PM   #7
JGard
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I'm doing the same thing with my Opel in a month!

except, I'm getting a whole second car, so parts will be easy...but if I come across anything I deem relevant, I'll let you know.
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Old 03-24-2003, 07:45 PM   #8
subarurabbit
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specs for '92 Legacy:

front tread sedan:
1460mm
1465mm for turbo

rear tread sedan:
1455mm

front tread wagon:
1460mm

rear tread wagon:
1450mm
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Old 03-24-2003, 08:09 PM   #9
Rovah
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Just a question, wouldn't the swap from 4.11 to 3.9 result in a more sluggish car?

Regards, John
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Old 03-24-2003, 09:22 PM   #10
Wheels
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Andrew man sorry about the bad tranny luck.

Simply find someone who has wreaked his wrx and take the tranny, Propshaft and rear diff with all drive shafts, Shifter and linkage. Clutch assembly, flywheel ect. You can do the change in less than a day 2 tops skilled or not. You have to remember to get the center console to and pedal assembly to. Its not to big of a job. I was pretty shocked how easy it is to do it. Its a shame you live so far away I would have towed it to a local shop and we could have done it there.

Yeah your best bet is get the parts from a totaled or rolled wrx it will be so much easier to do it and you know there parts are all there. Even if it sets you back 2,500 it will be a breeze to swap out your tranny and clutch next time you kill it. (note you probably will do it again just because your new to the wrx tranny. Better doing it with stock wrx parts than making fit a none impreza setup and having later problems trying to source parts.)

Keep us posted on how it goes. Don't forget rear diff carriers and what not when you swap.
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