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Old 03-01-2018, 11:20 AM   #1
BrandonBailey
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OMGHi2U 05 WRX Swap to 4.11 Help

Alright so I am basically just in need of some clarity. Over the past 3 days I have been on Nasioc, google, ebay, craigslist, etc. searching for transmissions, gear ratios, final drive, and researching what the best transmission for me is. I have read many forums stating that the 4.44 just isn't good for a dd car, and that the 3.90, 1.1-1, 3.54 in the stock 05 wrx should have been the 4.11 or 4.44 setup for various reasons. I believe I have decided on the 4.11 transmission. The code is 4S-TY754VBBBA. I read that you would need to use an auto wrx rear diff with the 4.11 ratio. I found an 02-03 for a good price. From what I have read my car has a pull style clutch, so does this trans, so I know that's good. Now the things I want to make sure of are

- Will the shift linkage from my 05 wrx swap over to this transmission(it does not come with the shifter)?

- Will the 02-03 auto wrx diff fit properly(I believe I read that my axles will fit into this diff, please correct me if I'm wrong there)?

- I know that for the front axles I need something different, mine are male on both ends currently, and this trans has stubs. So should I be getting 04 wrx axles then?

- and finally which driveshaft do I need to be using my stock 05 wrx, or do I need an auto wrx ds?

I've read in some places where an 02 wrx swapped to this trans using the stock 02 wrx 5-speed ds, and a 04 wrx that used and auto ds. Just want to make sure I have what I need. Any input would be greatly appreciated.
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Old 03-01-2018, 12:26 PM   #2
Samurai Jack
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OK, so this is what you have:
4S-TY754VBBBA
JDM WRX / WRX STi MY 1999 - 2000

3.166 1.882 1.296 0.972 0.738

1.0:1 transfer gear
4.444 rear diff

p/n 27020AA050 would be a matching rear diff from a manual transmission

You would use your OEM WRX driveshaft
The shift linkage would be a direct swap

Whether or not the 3.90 vs. the 4.44 rear diff is good all depends on if it is goof for YOU and what you want it for?
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Old 03-01-2018, 01:10 PM   #3
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Originally Posted by Samurai Jack View Post
OK, so this is what you have:
4S-TY754VBBBA
JDM WRX / WRX STi MY 1999 - 2000

3.166 1.882 1.296 0.972 0.738

1.0:1 transfer gear
4.444 rear diff

p/n 27020AA050 would be a matching rear diff from a manual transmission

You would use your OEM WRX driveshaft
The shift linkage would be a direct swap

Whether or not the 3.90 vs. the 4.44 rear diff is good all depends on if it is goof for YOU and what you want it for?
Thanks for the reply, I am still a little confused though.
This jdm 4S-TY754VBBBA trans is 4.11 ratio, shouldn't I be matching that with a 4.11 rear diff and not a 4.44 rear diff?
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Old 03-01-2018, 02:43 PM   #4
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Originally Posted by BrandonBailey View Post
Thanks for the reply, I am still a little confused though.
This jdm 4S-TY754VBBBA trans is 4.11 ratio, shouldn't I be matching that with a 4.11 rear diff and not a 4.44 rear diff?
Sorry, my mistake. Sometimes had to read data charts. That data can all run together.

That transmission is for a JDM Legacy Turbo, MY 2001 - 2003
It does have a 4.111 final drive.

The rear diff p/n I listed above is the correct rear diff p/n.
Everything else is the same
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Old 03-01-2018, 03:07 PM   #5
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why dont you adjust your tire size its alot easier... ifn you are really interested in the gearing though, my 98rs had a 4.11 fr its a r160 on a 1.1 center diff so yeah there you go. it did suck on the freeway though
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Old 03-01-2018, 03:26 PM   #6
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Originally Posted by Samurai Jack View Post
Sorry, my mistake. Sometimes had to read data charts. That data can all run together.

That transmission is for a JDM Legacy Turbo, MY 2001 - 2003
It does have a 4.111 final drive.

The rear diff p/n I listed above is the correct rear diff p/n.
Everything else is the same
So it does run a 4.44 diff. Alright I think I have all the information I need now, thanks a lot for your help Samurai Jack!
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Old 03-01-2018, 03:31 PM   #7
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why dont you adjust your tire size its alot easier... ifn you are really interested in the gearing though, my 98rs had a 4.11 fr its a r160 on a 1.1 center diff so yeah there you go. it did suck on the freeway though
Huh, from what others said about the 4.11 on here it seemed to be a good "middle man" for both dd and those who want better acceleration. Lots said that its not bad on the highway compared to the 4.44(being in the ballpark of 3200-3600 @ 70-75 mph). My reason for looking into this is I believe my transmission is going out. I'm not having any issues shifting into any gear, but it sounds like a piece of something is moving around in the trans/diff, only when the clutch is out and driving though. The second the clutch is put in to come to a stop the noise stops as well. I looked into the possibility of it being the TOB, but its almost brand new and sounds farther back than its location.
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Old 03-01-2018, 06:58 PM   #8
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I love my 4.44 for DD. Isn't bad on the freeway at all, but everyone is different. The higher rpms don't bother me.
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Old 03-01-2018, 07:40 PM   #9
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Originally Posted by monkeyposeur View Post
I love my 4.44 for DD. Isn't bad on the freeway at all, but everyone is different. The higher rpms don't bother me.
Hey just out of curiosity what rpm do you sit at going 70-75? I really like what I heard about the acceleration of the 4.44 setup, and I actually found a 45k mile trans/diff for sale cheaper than the 4.11. I drive mostly small city, but go on road trips and i currently sit around 2700-3000 at 70-75mph. Thanks for chiming in on this
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Old 03-02-2018, 12:40 AM   #10
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Originally Posted by BrandonBailey View Post
Hey just out of curiosity what rpm do you sit at going 70-75? I drive mostly small city, but go on road trips and i currently sit around 2700-3000 at 70-75mph. Thanks for chiming in on this
I'll have to check next in the next day or two and get back to you but I think it's about 3200-3400 rpms. I maybe drive 1/6 of my time on the freeway. I was concerned a bit about the higher rpms but had absolutely no regrets the first time I tried it. Acceleration is so much better on the city and the freeway.

Longest road trip I've done so far is about 7 hours. Also, my car is pretty damn loud, lol.
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Old 03-02-2018, 09:34 AM   #11
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Originally Posted by monkeyposeur View Post
I'll have to check next in the next day or two and get back to you but I think it's about 3200-3400 rpms. I maybe drive 1/6 of my time on the freeway. I was concerned a bit about the higher rpms but had absolutely no regrets the first time I tried it. Acceleration is so much better on the city and the freeway.

Longest road trip I've done so far is about 7 hours. Also, my car is pretty damn loud, lol.
That would be awesome, honestly if it would only put 3200-3400 at 70-75 I may go with the 4.44 setup. And I'm with you there on loud, It's actually almost soothing though I sleep with constant fan noise, and on the highway... lol that rumble. Anyway thanks man, just lmk when you get the chance to take a look
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Old 03-02-2018, 08:27 PM   #12
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Approximately 3150 rpms @ 72 mph. This is on stock 16" rims w/Blizzaks. My speedometer seems like it is correct when I have driven past indicators. It's a JDM cluster but has been flashed to read in mph.

Dang, car is dusty, lol.
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Old 03-03-2018, 12:27 AM   #13
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Originally Posted by monkeyposeur View Post


Approximately 3150 rpms @ 72 mph. This is on stock 16" rims w/Blizzaks. My speedometer seems like it is correct when I have driven past indicators. It's a JDM cluster but has been flashed to read in mph.

Dang, car is dusty, lol.
Thanks for taking the time to post that information man! I really appreciate it. I spoke to a jdm trans dealer today and they said the 4.11 transmission must be paired with a 4.11 diff, however I have seen a trans/diff combo of 4.11 with 4.44 diff on ebay(I know ebay's not the best place, but I was looking all over). The company stated that they have helped with many of these swaps and also selling them and that it would destroy the transmission to run a 4.11 trans with a 4.44 diff, because the rear diff can't be a higher ratio than the front. Do you know that to be true as well? I'm assuming that has something to do with the T.R of 1.0 in the trans? The company's name was JSAMotors.
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Old 03-04-2018, 12:27 AM   #14
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Quote:
Originally Posted by BrandonBailey View Post
Thanks for taking the time to post that information man! I really appreciate it. I spoke to a jdm trans dealer today and they said the 4.11 transmission must be paired with a 4.11 diff, however I have seen a trans/diff combo of 4.11 with 4.44 diff on ebay(I know ebay's not the best place, but I was looking all over). The company stated that they have helped with many of these swaps and also selling them and that it would destroy the transmission to run a 4.11 trans with a 4.44 diff, because the rear diff can't be a higher ratio than the front. Do you know that to be true as well? I'm assuming that has something to do with the T.R of 1.0 in the trans? The company's name was JSAMotors.
Yes they have to be the same.
I have a 06 Outback XT 5spd with 4.44 and matching diff. I also have a legacy GT with a 4.11 and matching diff. Ill sell either of them
I did a forester xt 4.44 into a 03 wrx. It was a blast on the street.
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Old 03-04-2018, 01:20 AM   #15
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Quote:
Originally Posted by BrandonBailey View Post
Huh, from what others said about the 4.11 on here it seemed to be a good "middle man" for both dd and those who want better acceleration. Lots said that its not bad on the highway compared to the 4.44(being in the ballpark of 3200-3600 @ 70-75 mph). My reason for looking into this is I believe my transmission is going out. I'm not having any issues shifting into any gear, but it sounds like a piece of something is moving around in the trans/diff, only when the clutch is out and driving though. The second the clutch is put in to come to a stop the noise stops as well. I looked into the possibility of it being the TOB, but its almost brand new and sounds farther back than its location.
i personally like to cruise around 80 so yeah i didnt like the 4.11 too much for my cruising on the freeway. if you can afford it the speed from a legacy spec b is the way to go, or if you can keep your 5 gear and get a ra gears for a 5 speed and use your 3.9. the biggest problem with the 4.11 or even the 4.44 is tha when you are cruising on the freeway, you wil be close to boost and your mpg will suffer badly.
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Old 03-04-2018, 04:35 AM   #16
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Yes both diffs need to be the same to match, jist like for any 4x4 rear needs to match up with front because of tooth count... cant hsve 42teeth in rear with 39 infront...faster rotation in the back vs the front ...which in return will screw the tranny up...unless u put bigger tires on the front to make up for the rotational lost...still wouldnt recommend that because tire size would be way bigger
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Old 03-04-2018, 06:54 AM   #17
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Please please inform yourself. ..... don't listen to these people who say 4.11 always needs rear and front matching diff ratio....

Only one perfect and accurate way to find out .....
Pull of the transfercase plate and count the teeth on the transfer gear
A transfer gear is a gear that moves power from the gearbox to the center diff
There is only 2 options... subaru came with a 1:1 center diff ratio that means back and front need to be matched ...and the other is a 1:0:1 I think.... can't remember the exact number but what the other one is besides the 1:1 is like having a 3.9 front diff with a 4.11 rear diff

If u have a drop gear/ transfer gear with a drop in different ratio it means u have to match it to the % of the drop gear...

LISTEN UP this is were people get it trouble BIG TIME .....like me once apon a time....
U can't go by what is specified on the gearbox part number because that gearbox is 20 years old ..... in 20 years a lot of parts internals could be changed like what happen to me.

I was driving with a 4.44 front gearbox and a machinic said I'll find out what your front diff ratio is ...Witch was OK to do but. ..he didn't know that some jdm gearboxes have a drop gear in the transfer case meaning it's not a 1:1 ratio ...It was a 1:0:1 or some other number
So what that ment was I needed to put in a diff ration with 19 or 25% difference. .

After mechanic put the wrong different gear ratio it was low on power and 80% front wheel and only 20% rear diff active... Center diff didn't know what to do and went through 2 center diffis and many other parts ...this costed me 7 to 8 k in a waste of money because no one explained this ....

Can't explain anymore will touch on it tomorrow need to go to bed for work tomorrow

But on also reading about 4.44 being not good for DD I call big ass rubish on that ...
4.44 is awesome I kill ls1 having 240rwkw and my gf8 only had tbe and vf22 untuned..
Also did 12.8 1/4 mile untuned 14psi...

4.44 is the magic number that makes a subaru come alive .... no suprise Honda cars have 4.11 and lower even to 5.11 ...thats why Hondas are so quick and good
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Old 03-04-2018, 12:15 PM   #18
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Please please inform yourself. ..... don't listen to these people who say 4.11 always needs rear and front matching diff ratio....
Only listen to this guy ^^^ if you want to trash your transmission in short order.

He has no idea what he is talking about.
Like many of us already said, you have to match your rear diff ratios to your transmission ratios, inclusive of the transfer ratio.

I provided you the p/n of the rear diff that matches your transmission.
Also remember I said IF you buy from a reputable importer, not some hack off of e-bay.

Take this statement, for example, "There is only 2 options... subaru came with a 1:1 center diff ratio that means back and front need to be matched ...and the other is a 1:0:1 I think.... can't remember the exact number but what the other one is besides the 1:1 is like having a 3.9 front diff with a 4.11 rear diff "

Subaru has a 1.0:1 ( 1:1 ) and a 1.1:1 ratio. That's it.
Then he said that having a 3.90 front diff gets matched to a 4.11 rear diff?!

Do that, and you'll trash your transmission.
3.90 front diff with a 1:1 transfer gear needs a 3.90 rear diff.
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Old 03-04-2018, 03:02 PM   #19
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I disagree with the reason why the are so fast is because of the gear ratios. it all depends on what you are looking for, for the 1/4 mile you want to shift as little as possible. So you want to set up your gears so that you are at the height of 3rd gear at the very end of the run. that is what will make you fast. also one thing i have noticed is that when you do lower your gear ratio, you need to adjust your wastegate duty as you are taking away some of the load that helps to spool the turbo
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Old 03-04-2018, 03:53 PM   #20
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Originally Posted by Samurai Jack View Post
Only listen to this guy ^^^ if you want to trash your transmission in short order.

He has no idea what he is talking about.
Like many of us already said, you have to match your rear diff ratios to your transmission ratios, inclusive of the transfer ratio.

I provided you the p/n of the rear diff that matches your transmission.
Also remember I said IF you buy from a reputable importer, not some hack off of e-bay.

Take this statement, for example, "There is only 2 options... subaru came with a 1:1 center diff ratio that means back and front need to be matched ...and the other is a 1:0:1 I think.... can't remember the exact number but what the other one is besides the 1:1 is like having a 3.9 front diff with a 4.11 rear diff "

Subaru has a 1.0:1 ( 1:1 ) and a 1.1:1 ratio. That's it.
Then he said that having a 3.90 front diff gets matched to a 4.11 rear diff?!

Do that, and you'll trash your transmission.
3.90 front diff with a 1:1 transfer gear needs a 3.90 rear diff.
Hey yeah I decided to go with a 50k mile 4.11 trans with 4.11 diff. Comes with the female axles for the stub shafts up front and all. JSAMotors.com is the place I ordered from, I paid about $1200, which I don't feel is too bad considering I was having a bad time even finding a stock wrx trans. And Its even going to be here on the 7th. I think this will be a nice small upgrade. My highway speeds around the Missouri area are only between 60-75, but of course we all like to get on it from time to time, and we don't care about our fuel economy at that point lol. Thanks to everyone else who chimed in as well, this is my first post for help on this website and Its awesome to find a community who's willing to help out with things like this

Last edited by BrandonBailey; 03-05-2018 at 06:21 PM.
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Old 03-05-2018, 10:38 AM   #21
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get a jdm suretrac lsd rear diff. i got one for my 4.11 R160 setup and it is badass.
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Old 03-05-2018, 11:11 AM   #22
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get a jdm suretrac lsd rear diff. i got one for my 4.11 R160 setup and it is badass.
I've been looking for one of those for a while. Seems like every time I call a supplier, they don't have them. But yes, get one.

Quote:
Originally Posted by BrandonBailey View Post
Hey yeah I decided to go with a 50k mile 4.11 trans with 4.11 diff. Comes with the female axles for the stub shafts up front and all. JSAMotors.com is the place I ordered from, I paid about $1200, which I don't feel is too bad considering I was having a bad time even finding a stock wrx trans. And Its even going to be here on the 7nth. I think this will be a nice small upgrade. My highway speeds around the Missouri area are only between 60-75, but of course we all like to get on it from time to time, and we don't care about our fuel economy at that point lol. Thanks to everyone else who chimed in as well, this is my first post for help on this website and Its awesome to find a community who's willing to help out with things like this
Good choice. I have the 4.11 in my wrx. I look at it as best of both worlds. Around town it has a little better pick up than the stock 3.9, but also isn't screaming going down the highway. And honestly, my gas mileage didn't change much until I did some engine work.
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Old 03-05-2018, 06:38 PM   #23
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I've been looking for one of those for a while. Seems like every time I call a supplier, they don't have them. But yes, get one.



Good choice. I have the 4.11 in my wrx. I look at it as best of both worlds. Around town it has a little better pick up than the stock 3.9, but also isn't screaming going down the highway. And honestly, my gas mileage didn't change much until I did some engine work.
Good to hear, that's what I was looking for, something that's a little more fun but still relatively lower rpm on the highway. But that pic above of the 4.44 honestly didn't look too bad at highway speeds either. I have been looking into the suretrac r160, but also have found that they are hard to find anywhere as you said, sadly. Oh and a heads up when I was talking to Sam(A guy at jdmracingmotors.com, that directed me to jsamotors), he said that they are getting a big shipment in about 2 weeks. May be able to snag one right off the boat lol. And yeah I was wondering if I would even notice anything mpg wise, unless I go built motor I imagine I'm about as bad as I'm going to be already.. I've got the normal sti goodies, vf39, 565 inj, UEL header, full exhaust, AP v3, 93oct pro tune @ 19psi. I'm expecting maybe a couple mpgs loss worst case
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Old 09-01-2019, 08:45 AM   #24
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Originally Posted by BrandonBailey View Post
Alright so I am basically just in need of some clarity. Over the past 3 days I have been on Nasioc, google, ebay, craigslist, etc. searching for transmissions, gear ratios, final drive, and researching what the best transmission for me is. I have read many forums stating that the 4.44 just isn't good for a dd car, and that the 3.90, 1.1-1, 3.54 in the stock 05 wrx should have been the 4.11 or 4.44 setup for various reasons. I believe I have decided on the 4.11 transmission. The code is 4S-TY754VBBBA. I read that you would need to use an auto wrx rear diff with the 4.11 ratio. I found an 02-03 for a good price. From what I have read my car has a pull style clutch, so does this trans, so I know that's good. Now the things I want to make sure of are

- Will the shift linkage from my 05 wrx swap over to this transmission(it does not come with the shifter)?

- Will the 02-03 auto wrx diff fit properly(I believe I read that my axles will fit into this diff, please correct me if I'm wrong there)?

- I know that for the front axles I need something different, mine are male on both ends currently, and this trans has stubs. So should I be getting 04 wrx axles then?

- and finally which driveshaft do I need to be using my stock 05 wrx, or do I need an auto wrx ds?

I've read in some places where an 02 wrx swapped to this trans using the stock 02 wrx 5-speed ds, and a 04 wrx that used and auto ds. Just want to make sure I have what I need. Any input would be greatly appreciated.

Did you have any success with this swap? I’m doing it in my 04 Wrx as of now. Did the stock Wrx clutch work for you? Thanks!
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Old 09-01-2019, 12:56 PM   #25
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Did you have any success with this swap? I’m doing it in my 04 Wrx as of now. Did the stock Wrx clutch work for you? Thanks!
you know what you can do too is get smaller tires. instead of 205 55 16 get 2055016 it does make a difference and not too much difference in cruising speeds
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