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Old 10-12-2009, 11:07 PM   #1
Jubert69
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ej207 spec C 18g

Default Converting your 4EAT to 5MT

Thinking about converting your 4EAT to 5MT?

If you have an 02-07 AT Impreza WRX, here is the complete list of items you will need for a complete.
WRX 5MT Transmission
WRX Matching Rear Diff
WRX Driveshaft
Matching Front Axles
Matching Clutch, Flywheel, Pressure Plate
Matching WRX/STi Clutch Slave Cylinder
WRX Shifter Assembly
WRX Pedal Assembly**
WRX ABS Unit*
WRX MT Cluster*
WRX MT ECU*


*Not needed, but part may not work properly, but allows car to be drivable
** Can get just the clutch/brake pedal


The 5 speed mates up with the engine the same way as the 4EAT does, so there are no mechanical issues.
Unfortunately, some things are lost/problems are created during the swap due to wiring differences.

1. ABS - The 4EAT ABS system has a signal coming from the TCU, which you remove so your ABS no longer functions.
2. Speedometer - The difference here is the 4EAT has 2 wires for the speed sensor and 3 wires for the 5MT. Your speed will stay at 0 MPH.
3. Reverse Lights - Since you won't have the AT Shifter to tell the car it's in reverse, the car has no idea what whether you are in reverse or 1-5.
4. Starter - Starter is hooked up for the 4EAT so it won't start.
5. Key Lock - The car doesn't think you are in Park so the key gets locked in.
6. CEL - P0866 Transmission isn't sending correct signals since it's a 5MT now.


Is the swap worth it?
Do it if you are in the following situations:
1. You want to learn and gain experience working on Subarus
2. Your 4EAT crapped out.
3. You have a lien on the car.

Don't do it if you are doing it just because you want a 5MT. Sell your car and get the manual version.
Why? You will be spending over $2k on transmission/parts + labor costs. This will also make your car harder to sell in the future. The swap has decreased your cars value.



Now if you are truley determined to swap your 4EAT, read on.

1. Transmission and Rear Differential
You have a choice of any WRX 5MT(6 Speeds obviously swap in too, but I will not cover that)

02-05 5MT
3.54 Rear Diff, Pull Style Clutch

06-07 5MT
3.70 Rear Diff, Push Style Clutch

02-07 4EAT
4.11 Rear Diff

2. Driveshaft
Any USDM WRX Driveshaft(Not STi/4EAT Driveshaft)

3. Clutch Assembly/Clutch Slave Cylinder
Depending on what year transmission you go, you will have to get the correct clutch assembly(Push/Pull Style)

4. ECU
I decided to get the MT ECU to remove any extra problems I may have. I have not tested the car with a 4EAT ECU.

5. ABS Unit
Any WRX MT unit should work.

6. Axles
02-04 Female
04-07 Male

In early 04, they used female axles and then switch to male.

7. Wiring
Starter - Either you can hook it up to your clutch or do what I did and connect the ignition to the battery(Allows you to start your car without pushing in the clutch, however, it will try to start if you are in gear)
Speedometer - You will have 3 wires now coming out of the transmission. I had merged a wire from the tranny to the ECU's Vehicle Speed Sensor.
Reverse Lights - You will have another 2 wires coming out of the transmission towards the drivers side. This is the reverse switch and connect one end to a 12v ignition source and the other to the reverse lights.
Key Lock - There will be 4 wires coming out of where the old shifter used to be, merge the 2 solid color wires together.
CEL - P0866 Have someone with a tactrix cable disable this
Neutral Position Switch - (Still doing research)

SEE POST #47

For the Impreza Wiring Diagram (Thanks to NorthUrsalia)
http://northursalia.com/modification...ingdiagram.pdf

For the ECU Pinouts
http://northursalia.com/modification...ng/wiring.html


Remember to have everything ready before hand, learning from personal experience.
All necessary parts + Following tools/Supplies
WD40/PB Blaster
Clutch Alignment Tool
Brake Fluid (You need this to bleed the clutch)
Tranny Fluid
Torque Wrench
Transmission Jack
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Last edited by Jubert69; 11-26-2010 at 01:13 AM.
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Old 10-13-2009, 02:22 PM   #2
scOOtNsOOby
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you are awesome. You helped me out so much.
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Old 01-25-2010, 02:10 AM   #3
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bloody fantastic writeup... nice work
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Old 01-25-2010, 12:50 PM   #4
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I assume that I can simply reverse this if I'm going from a 5spd to an auto????

In its present incarnation the car is an 02 WRX with a hybrid engine and a virtually new transmission with Albins gears. I'm planning to replace the wiring harness.

Thanks for the post.
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Old 01-25-2010, 11:24 PM   #5
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^^^^^^ill trade ya transmissions and help ya with the swap!!!^^^^^
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Old 01-25-2010, 11:25 PM   #6
Jubert69
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Quote:
Originally Posted by silverF4turbo View Post
bloody fantastic writeup... nice work
Thank you sir!

Going to need to update it soon again and clean it up.

Quote:
Originally Posted by waiguoren View Post
I assume that I can simply reverse this if I'm going from a 5spd to an auto????

In its present incarnation the car is an 02 WRX with a hybrid engine and a virtually new transmission with Albins gears. I'm planning to replace the wiring harness.

Thanks for the post.
No you can't unless you replace the whole wiring harness. There will be no wiring setup for the TCU on the 4EATs.
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Old 03-12-2010, 12:30 PM   #7
imc343
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im doing the same thing on my 95 impreza L soon im guessing my swap will be even easyer
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Old 03-12-2010, 12:31 PM   #8
imc343
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i cant find any threads on this swap for my car so if somone could help me out with a parts list that would be awsome
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Old 03-16-2010, 01:27 AM   #9
Jubert69
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You're going to need pretty much everything listed above except for ECU.
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Old 05-09-2010, 03:17 PM   #10
mr_bojangls3
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Default same boat

i have a 06 2.5i and it seems alot easier to just buy a wrx
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Old 05-12-2010, 04:51 PM   #11
Jubert69
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Quote:
Originally Posted by mr_bojangls3 View Post
i have a 06 2.5i and it seems alot easier to just buy a wrx
"Don't do it if you are doing it just because you want a 5MT. Sell your car and get the manual version.
Why? You will be spending over $2k on transmission/parts + labor costs. This will also make your car harder to sell in the future. The swap has decreased your cars value."

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Old 05-12-2010, 07:03 PM   #12
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I am almost all the way done with doing a conversion right now, and all I am trying to figure out is the trans wiring... *Sigh* how should I go about it, there are 2 plugs and Im not sure how to tie them in to my current system. I take it I just need the part of the wiring harness between the trans and ecu?
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Old 05-13-2010, 12:53 AM   #13
Jubert69
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You can make your own.

On the plugs that are left from the automatic that is in your engine bay IIRC has everything needed. All you need to do is merge wires from the transmission to those.
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Old 05-15-2010, 02:55 AM   #14
Team Scream
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Quote:
Originally Posted by Jubert69 View Post
You can make your own.

On the plugs that are left from the automatic that is in your engine bay IIRC has everything needed. All you need to do is merge wires from the transmission to those.
Jubert69,
Fantastic write up man, and this could not have come at a better time.
I am just ready to begin a 6MT swap into a 2006 4EAT Forester FXT.

I have all of the hard parts (tranny, diff axles etc.), I also have the 5MT ECU, gauge cluster, ignition switch/key and immobilizer stuff.

I am mostly concerned about the trans plug you mentioned in the previous post. When you say "merge" the wires, can you elaborate please? Do the 2 plugs mate? or are we going to be splicing wire here? And if so, do you have a pin out for those wires?

Thanks again for the write up man, I will happily share my experience with you here, so you can add my data to your post if it helps.

subscribed.
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Old 05-15-2010, 04:01 AM   #15
Jubert69
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ej207 spec C 18g

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TS,

When I mean merge the wires, IIRC(been a while ), you're going to have sensors on your transmission with plugs coming out of them. At the end of the plugs, because of your wiring harness you won't have the proper plugs to plug them into. So what I did was cut the ends of them(Speed sensor) and brought wires into the cabin and spliced them to the ECU. I also did the same thing to the reverse switch to the rear taillights.

However, I still have yet to figure out my NPS issue which I plan on figuring it out within a few weeks.

I just got an HD video camera, so if you would like I can take a video for ya on what I did.
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Old 05-15-2010, 02:18 PM   #16
Team Scream
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Quote:
Originally Posted by Jubert69 View Post
TS,

When I mean merge the wires, IIRC(been a while ), you're going to have sensors on your transmission with plugs coming out of them. At the end of the plugs, because of your wiring harness you won't have the proper plugs to plug them into. So what I did was cut the ends of them(Speed sensor) and brought wires into the cabin and spliced them to the ECU. I also did the same thing to the reverse switch to the rear taillights.

However, I still have yet to figure out my NPS issue which I plan on figuring it out within a few weeks.

I just got an HD video camera, so if you would like I can take a video for ya on what I did.
Yeah man, I am doing my swap over at a buddies machine shop since he has a lot of flat floor space.
I just want to be able to drive the car out of there and back to my house so I can get the car out of his shop asap.
I can work out the other details like reverse lights later.

So, if you can tell me what to focus on as far as wiring is concerned to get the car running when the swap is done that would be fantastic.

If you are inclined to do the video thing that would be HUGE bro, and I woud definitely appreciate it.!!!
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Old 05-15-2010, 07:23 PM   #17
Jubert69
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ej207 spec C 18g

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Yeah I'll try the video.

As for getting it running, you don't even need the speedo. All you need is to get the starter going. (This will obviously not add to your milage and be somewhat illegal)
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Old 05-24-2010, 11:46 AM   #18
Beat Professor
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Thanks and subscribed.
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Old 05-24-2010, 01:23 PM   #19
iluvdrt
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Quote:
Originally Posted by Jubert69 View Post
Thinking about converting your 4EAT to 5MT?

If you have an 02-07 AT Impreza WRX, here is the complete list of items you will need for a complete.
WRX 5MT Transmission
WRX Matching Rear Diff
WRX Driveshaft
Matching Front Axles
Matching Clutch, Flywheel, Pressure Plate
Matching WRX/STi Clutch Slave Cylinder
WRX Shifter Assembly
WRX Pedal Assembly**
WRX ABS Unit*
WRX MT Cluster*
WRX MT ECU*

You do not need the manual ABS, ECU or speedo, Ill explain later


*Not needed, but part may not work properly, but allows car to be drivable
** Can get just the clutch/brake pedal


The 5 speed mates up with the engine the same way as the 4EAT does, so there are no mechanical issues.
Unfortunately, some things are lost/problems are created during the swap due to wiring differences.

1. ABS - The 4EAT ABS system has a signal coming from the TCU, which you remove so your ABS no longer functions. Do not remove the TCU and you keep ABS. Use the neutral wires from the automatic selector harness to run into the NSS on the clutch. This lets the ECU think the car is in gear when the circut is open and closed for start ups when the clutch is depressed.
2. Speedometer - The difference here is the 4EAT has 2 wires for the speed sensor and 3 wires for the 5MT. Your speed will stay at 0 MPH. Use the VSS from the automatic. It fits, you just have to legthen the harness a bit. Becareful not to loose the little key inside the sensor.
3. Reverse Lights - Since you won't have the AT Shifter to tell the car it's in reverse, the car has no idea what whether you are in reverse or 1-5. wire the lights into the sensor on the tranny into the reverse section of the 4EAT harness.
4. Starter - Starter is hooked up for the 4EAT so it won't start. you need a manual starter plug the two wires together from the shifter. use the neutral coming off the trans selctor harness to start car.

5. Key Lock - The car doesn't think you are in Park so the key gets locked in.see #4, plug the shifter wires together
6. CEL - P0866 Transmission isn't sending correct signals since it's a 5MT now.
Ground out the manual ID pin on the ECU and everything is OK. There is no diff between ECU's on auto or manual, only an ID pin that is grounded.

Is the swap worth it?
Do it if you are in the following situations:
1. You want to learn and gain experience working on Subarus
2. Your 4EAT crapped out.
3. You have a lien on the car.

Don't do it if you are doing it just because you want a 5MT. Sell your car and get the manual version.
Why? You will be spending over $2k on transmission/parts + labor costs. This will also make your car harder to sell in the future. The swap has decreased your cars value.



Now if you are truley determined to swap your 4EAT, read on.

1. Transmission and Rear Differential
You have a choice of any WRX 5MT(6 Speeds obviously swap in too, but I will not cover that)

02-05 5MT
3.54 Rear Diff, Pull Style Clutch

06-07 5MT
3.70 Rear Diff, Push Style Clutch

02-07 4EAT
4.11 Rear Diff

2. Driveshaft
Any USDM WRX Driveshaft(Not STi/4EAT Driveshaft)

3. Clutch Assembly/Clutch Slave Cylinder
Depending on what year transmission you go, you will have to get the correct clutch assembly(Push/Pull Style)

4. ECU
I decided to get the MT ECU to remove any extra problems I may have. I have not tested the car with a 4EAT ECU.

5. ABS Unit
Any WRX MT unit should work.

6. Axles
02-04 Female
04-07 Male

In early 04, they used female axles and then switch to male.

7. Wiring
Starter - Either you can hook it up to your clutch or do what I did and connect the ignition to the battery(Allows you to start your car without pushing in the clutch, however, it will try to start if you are in gear)
Speedometer - You will have 3 wires now coming out of the transmission. I had merged a wire from the tranny to the ECU's Vehicle Speed Sensor.
Reverse Lights - You will have another 2 wires coming out of the transmission towards the drivers side. This is the reverse switch and connect one end to a 12v ignition source and the other to the reverse lights.
Key Lock - There will be 4 wires coming out of where the old shifter used to be, merge the 2 solid color wires together.
CEL - P0866 Have someone with a tactrix cable disable this
Neutral Position Switch - (Still doing research)

For the Impreza Wiring Diagram (Thanks to NorthUrsalia)
http://northursalia.com/modification...ingdiagram.pdf

For the ECU Pinouts
http://northursalia.com/modification...ng/wiring.html


Remember to have everything ready before hand, learning from personal experience.
All necessary parts + Following tools/Supplies
WD40/PB Blaster
Clutch Alignment Tool
Brake Fluid (You need this to bleed the clutch)
Tranny Fluid
Torque Wrench
Transmission Jack
Here is a link to my swap with a write up and pics. I have NO CEL, cruise still works, and so does my ABS. The car looks and performs as if it came from the factory.
http://forums.nasioc.com/forums/show...hlight=iluvdrt

There are no diffs between my wagon and any other 4EAT. the only diff is ECU connector you have to ground. I believe it is pin 136 plug B on the newer models but on mine it was pin 86 since I only have 1 ginormous plug.
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Old 05-25-2010, 03:12 PM   #20
Jubert69
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ej207 spec C 18g

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How did you get your ABS to work? There is a wire that requires a signal from the TCU, and because it's not there anymore, it'll cause it to not work.

Edit: Nevermind, saw your thing in red. I shall try it out.
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Old 05-26-2010, 07:17 AM   #21
iluvdrt
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Quote:
Originally Posted by Jubert69 View Post
How did you get your ABS to work? There is a wire that requires a signal from the TCU, and because it's not there anymore, it'll cause it to not work.

Edit: Nevermind, saw your thing in red. I shall try it out.
Yeah you have to leave the auto TCU in place in order for it to work. It also effects the cruise as well. If you use the 2 neutral wires coming off the auto harness on the gear selector side and run that to your NS switch on the clutch pedal everything will work.

When the wires are open (clutch pedal up) it tells the TCU that your tranny is in gear (or at least not in neutral). When you depress the clutch pedal it tells the TCU youre in neutral. ABS works the same way. Your ABS will not work if the car is in neutral or park. The TCU has to think the car is in gear.

If you go to my link where I did my swap, I have pictures of everything and a schematic of the tranny selector harness. I addedd notes to make it easier to understand.
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Old 06-04-2010, 11:38 AM   #22
Mt. Hood 03 RS
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Does anyone know if these same step will work on my 2003 RS auto??
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Old 08-17-2010, 06:51 PM   #23
punk kid
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on a 99 rs what color wire is the neutral on the side of the trans. can you elaborate on what needs to be done to the speedo as well
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Old 08-26-2010, 01:58 PM   #24
Jubert69
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ej207 spec C 18g

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Quote:
Originally Posted by Mt. Hood 03 RS View Post
Does anyone know if these same step will work on my 2003 RS auto??
Should be the same.

Quote:
Originally Posted by punk kid View Post
on a 99 rs what color wire is the neutral on the side of the trans. can you elaborate on what needs to be done to the speedo as well
I just tested each set of wires to see which one turns on/off when putting into gear vs. neutral.

As for the speedo, you should have 3 wires coming out of your transmission. I forgot how it goes now, but one of em were grounded, one of them went to a part in the ECU and the other one went to another part of the ECU.
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Old 08-26-2010, 03:04 PM   #25
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Could you do the same accept keep your 4.11 fianl drive and use a RS/TS transmission? Any downside to this? Different clutch or anything like that?
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