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Old 11-08-2014, 08:08 PM   #1
Buzzed Trucks
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Default R180 Rear Differential in a 2012 WRX

Hey guys. I've done a good amount of research on fitting an R180 into WRX's, but I'm having trouble confirming information on fitting them into the GR's, specifically my 2012. I would prefer to keep my stock hubs, so info on hybrid axles will be needed as well. If anyone could give me info on fitment, it would be greatly appreciated! Thanks!


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Old 11-12-2014, 07:11 PM   #2
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Quote:
Originally Posted by Buzzed Trucks View Post
Hey guys. I've done a good amount of research on fitting an R180 into WRX's, but I'm having trouble confirming information on fitting them into the GR's, specifically my 2012. I would prefer to keep my stock hubs, so info on hybrid axles will be needed as well. If anyone could give me info on fitment, it would be greatly appreciated! Thanks!


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The axles are different spline counts on the r180 and the r160 so if you found a correct ratio r180 you could use spec B axles from the legacys that used the r180 rear with the 6 speed


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Old 11-12-2014, 08:06 PM   #3
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Quote:
Originally Posted by danbolsom View Post
The axles are different spline counts on the r180 and the r160 so if you found a correct ratio r180 you could use spec B axles from the legacys that used the r180 rear with the 6 speed


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where can you buy the legacy GT spec B axles? hard to find. do you have a link?
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Old 11-12-2014, 08:06 PM   #4
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Originally Posted by bmxhotsauce View Post
where can you buy the legacy GT spec B axles? hard to find. do you have a link?

You can get them from a dealer or rock auto im sure has them or a totaled 6 speed spec b


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Old 11-12-2014, 09:56 PM   #5
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Old 11-12-2014, 11:36 PM   #6
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No help really with that link beside converting . Can someone get a link to buy spec b axles ? I can find them on rock auto ? Thank you

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Old 11-12-2014, 11:54 PM   #7
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I'm not sure spec b axles are long enough for the GR wide body WRX.

Monkiboy did it by making hybrid axles using a GR STi inner CV joint and WRX outers.


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Old 11-13-2014, 01:15 AM   #8
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I have an 02 with an sti swap with a R180 diff

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Old 11-13-2014, 07:59 AM   #9
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Cool story.

This thread is about an R180 in a 2012.


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Old 11-13-2014, 09:07 AM   #10
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an 11-14 wrx can use STI rear axles in the stock wrx hubs when installing R180.

read up on xlubens 6 speed swap thread, he did it there. I have done it as well, along with a few others I know of for sure. Axle problem solved with 08-14 STI rear axles
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Old 11-13-2014, 11:27 AM   #11
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Yeah I was thinking that would be the case. I wasn't sure if the rear axle stubs were different length between WRX and STI like they are in the front.

Sounds like they are not though.

Now that you mention it, monkiboy used a hybrid axle because he is/was running the 08-10 narrow body.

08-10 = make a hybrid axle (for correct length)
11-14 = just use the 08-14 STI axle


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Old 11-13-2014, 12:00 PM   #12
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Quote:
Originally Posted by gsrcrxsi View Post
Now that you mention it, monkiboy used a hybrid axle because he is/was running the 08-10 narrow body. 08-10 = make a hybrid axle (for correct length) 11-14 = just use the 08-14 STI axle Sent from my iPhone using NASIOC
exactly right.
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Old 11-17-2014, 04:42 PM   #13
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yep-stock sti axles will work for the '12
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Old 11-25-2014, 02:57 PM   #14
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So from the reading, if I find an R180 Rear End/Differential with the right final drive ratio it will bolt right up to my GR/2014 WRX hatch driveshaft, and would only require the use of 08-14 Sti rear axle's? This would in turn leave the center diff the way it is and give me a limited slip rear.
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Old 11-25-2014, 03:58 PM   #15
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I'm doing my R180 swap tomorrow. (car is 08 wrx - so narrow body) will let you know how it goes.
I have the following components:
04 JDM V8 diff (HK) 3.9FD (JDM R180 has a small flange already so no need to swap one out of the R160)
2x 2010 USDM STi rear axles and as back up 2x V8 JDM axles and my WRX axles to make a hybrid shaft, but since I am lowered I think the difference in track is not going to be an issues when using stock GR STi axles.

BTW. if anyone needs a JDM 3.9 R180 V7/8 diff + axles I have local source ($500 for diff with axles)
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Old 11-27-2014, 09:56 PM   #16
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Quote:
Originally Posted by ej20ajk View Post
I'm doing my R180 swap tomorrow. (car is 08 wrx - so narrow body) will let you know how it goes.
I have the following components:
04 JDM V8 diff (HK) 3.9FD (JDM R180 has a small flange already so no need to swap one out of the R160)
2x 2010 USDM STi rear axles and as back up 2x V8 JDM axles and my WRX axles to make a hybrid shaft, but since I am lowered I think the difference in track is not going to be an issues when using stock GR STi axles.

BTW. if anyone needs a JDM 3.9 R180 V7/8 diff + axles I have local source ($500 for diff with axles)
Definitely let us now how everything went.

So as far as the R180, does this need to be sourced solely from a 2004 Sti or are there other years I can get them from as well?

Is there any need to swap ring gears?

Sorry for all the questions I'm new to Subaru, i don't post a ton on here yet mostly just read and research, until i actually know what I'm talking about.
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Old 11-27-2014, 10:16 PM   #17
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Diff swap is done. I used stock '10 STI axles and JDM V8 R180 HK diff. All bolted up without a hitch, as side note had to swap the flange and diff studs from my old R160. It took a bit over an hour for the whole job. As far as I could see, no issues or unusual noises (drove about 120km).
It snowed a bit today, and there is a definite difference in straight-line grip and cornering.

You can run a JDM V7/ V8 diff or USDM 04-05 diff. I have an access to JDM diffs and travel to Niagara Falls, NY once in a while, so I can source you a diff.
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Old 12-15-2014, 01:39 PM   #18
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So how has everything been going with this swap? You have obviously had time to put miles on it. Is it fully worth it, bang for buck? Thanks again for all of your feedback.
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Old 12-15-2014, 02:17 PM   #19
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Quote:
Originally Posted by ej20ajk View Post
Diff swap is done. I used stock '10 STI axles and JDM V8 R180 HK diff. All bolted up without a hitch, as side note had to swap the flange and diff studs from my old R160. It took a bit over an hour for the whole job. As far as I could see, no issues or unusual noises (drove about 120km).
It snowed a bit today, and there is a definite difference in straight-line grip and cornering.

You can run a JDM V7/ V8 diff or USDM 04-05 diff. I have an access to JDM diffs and travel to Niagara Falls, NY once in a while, so I can source you a diff.
It's as simple as that. Have fun!
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Old 12-21-2014, 04:48 PM   #20
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Quote:
Originally Posted by byastremski View Post
So how has everything been going with this swap? You have obviously had time to put miles on it. Is it fully worth it, bang for buck? Thanks again for all of your feedback.
Over 1.5k miles on the diff swap and no issues to speak off. Two snow storms later, and few dry days - definite improvement in traction when driven at the limit. In my opinion it was worth the $700 that I've spent.
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Old 02-01-2015, 07:03 PM   #21
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Quote:
Originally Posted by ej20ajk View Post
Diff swap is done. I used stock '10 STI axles and JDM V8 R180 HK diff. All bolted up without a hitch, as side note had to swap the flange and diff studs from my old R160. It took a bit over an hour for the whole job. As far as I could see, no issues or unusual noises (drove about 120km).
It snowed a bit today, and there is a definite difference in straight-line grip and cornering.

You can run a JDM V7/ V8 diff or USDM 04-05 diff. I have an access to JDM diffs and travel to Niagara Falls, NY once in a while, so I can source you a diff.
why did you end up swapping the flange if you bought the JDM diff? Just wanting to verify, if I bought a 2011 sti diff, I could swap my stock r160 flange on to the sti diff, the splines are the same?
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Old 02-03-2015, 12:23 AM   #22
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I'd love to know if swapping to an STI rear diff from a 2015 wrx is the same as previous generations. Any thoughts at all?
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Old 02-03-2015, 02:07 AM   #23
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Quote:
Originally Posted by Boogaloo Shrimp View Post
why did you end up swapping the flange if you bought the JDM diff? Just wanting to verify, if I bought a 2011 sti diff, I could swap my stock r160 flange on to the sti diff, the splines are the same?
2011 diff won't work because it's the wrong ratio. You want a 3.9 ratio R180 which I believe was only used on 04-05 STI's. From all the information I've gathered this is my parts list:

3.9 R180 from 04-05 STI or JDM equivalent (swap rear studs from R160 because there longer)
08+ STI rear axles
Possibly have to switch the front flange to mount to WRX driveshaft (only thing I'm unsure on)

Last edited by SDoBB; 02-03-2015 at 02:14 AM.
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Old 02-03-2015, 02:32 AM   #24
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Quote:
Originally Posted by SDoBB View Post
2011 diff won't work because it's the wrong ratio. You want a 3.9 ratio R180 which I believe was only used on 04-05 STI's. From all the information I've gathered this is my parts list:

3.9 R180 from 04-05 STI or JDM equivalent (swap rear studs from R160 because there longer)
08+ STI rear axles
Possibly have to switch the front flange to mount to WRX driveshaft (only thing I'm unsure on)

Thanks for the info. Ive been doing tons of reading on this but i cant find solid enough info. From what ive read, the 08+ wrx and sti both have a 3.9 final drive, but from what i understand the transfer gear ratio is 1.1:1 which means a 3.545 rear diff is needed to get to a final drive of 3.9. Looking at rear diffs on ebay, sellers claim that a 2011 sti diff is 3.9 and some claim 3.545, im beginning to think theres a disconnect between FD and rear diff ratio, which is confusing me and others so it seems. Help! Lol
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Old 02-03-2015, 03:57 AM   #25
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2011-2014 WRX has a 3.90 front gear with a 1:1 step and 3.90 rear gear
2011-2014 STI has a 3.90 front gear with a 1.1:1 step and 3.54 rear gear

I ran a 2005 STI trans (3.90 diff and 1:1 step) with 2013 WRX fron axles with my R160 in my 2013 WRX for 6 months then bought a DSS Carbon Driveshaft, and 2005 3.90 gear R180 and 2011-2014 STI rear axles to run in it.

On the 2011-2014 WRX the rear hubs dont need to be changed and STI axles will slide right in.
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