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Old 01-05-2010, 05:05 PM   #1
racer555
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Default r160 to r180 conversion axle ?'s

After searching what it takes to swap a r180 into my wrx I have run into some contradictions. Some say its possible to use either the inner sti cv joint onto the wrx axles or the wrx outter cv joint onto the sti axles. Some others say its not possible and I will have to either get custom axles (screw dss and their insane prices) or swap over to the rest of the rear sti hubs, brakes, etc. Has anyone actually tried to mate the 2 different kinds of axles/joints together? I am waiting on my r180 to show up still and was thinkin about getting some used axles to check this out but until then I was wondering if anyone had some more info.
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Old 01-05-2010, 05:24 PM   #2
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I have been wanting to try this but i believe its not possible, at least thats what i have heard. I am betting the STI Axle CV parts are beffier then the WRX. I thought you could machin a wrx hub to accept STI bearings and axles too as an option. there was some talk about the new legacy axles working cause it has a R180 and WRX size hubs but a think the length was off a bit. Wish there was an easier way though, good luck bud!
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Old 01-06-2010, 03:15 AM   #3
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i think you have that backwards.... machin an sti hub (04 to keep the 5X100) to fit the wrx bearings, and roaters...
but if anyone had pictures of this working or not working then that would be great along with pics of the hybrid axle working or not...
i am in the same boat as you... i really need to know
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Old 01-06-2010, 01:23 PM   #4
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Just swap the rear hubs, brakes and axles. In the end you will have a much better setup, and chances are it will cost about the same if you are thrifty and look for deals.
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Old 01-06-2010, 01:35 PM   #5
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The drive shaft shop has them.
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Old 01-06-2010, 04:58 PM   #6
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Quote:
Originally Posted by foolio View Post
The drive shaft shop has them.
Yes but I am not spending $1200 each axle. Screw that
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Old 01-06-2010, 05:07 PM   #7
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Quote:
Originally Posted by aboothman View Post
Just swap the rear hubs, brakes and axles. In the end you will have a much better setup, and chances are it will cost about the same if you are thrifty and look for deals.
Yeah I thought about goin that route. Its just hard to find '04 sti stuff so i can keep my 5x100. Besides I will be able to get some axles made quicker since I guess there is a local place that should be able to do what I want - sti axles and inner cv's with wrx outter cv's. Only thing is they may need me to get some used axles 1st to see how the parts are gonna go together, not a biggie just gonna take some time as the budget is pretty tight right now. Then again its my fault for tryin to build a suby into a drift car for cheap
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Old 01-08-2010, 06:16 AM   #8
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where the driveshaft meets is also different.
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Old 01-08-2010, 09:04 AM   #9
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Quote:
Originally Posted by punswrx View Post
i think you have that backwards.... machin an sti hub (04 to keep the 5X100) to fit the wrx bearings, and roaters...
What's a roater?

Quote:
Originally Posted by aboothman View Post
Just swap the rear hubs, brakes and axles. In the end you will have a much better setup, and chances are it will cost about the same if you are thrifty and look for deals.
For those of us that want to retain the ability to run small wheels with our small brakes, that's not an option. I've got 15x8" TE-37 auto-x wheels that I'd like to keep for the foreseeable future. From what I've seen/read, the only way to keep small brakes is to do all the STI hub conversion and then run the STI "gravel" brakes, which are FHI 2-pots. But that's not a low budget solution.

I'm interested to see what people find out. The Legacy axle option sounds interesting. I think it's just the H6 cars that have the R180, right?

Pat Olsen

Last edited by Patrick Olsen; 01-09-2010 at 02:24 PM.
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Old 04-27-2010, 01:32 PM   #10
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I have been checking with some local shops and there seem to be 2 ways of doing this.

1:Swapping the ends, my guy said if I bring him 2 axle's (1 of each) he will do the initial hybrid for free i.e he will try swapping the ends on 1 for no charge. and if it works he will do the rest for me or I can do them myself.

2: He will cut and splice the 2 axles making one with both ends.
He has done it on hondas and assures me the welded axle will hold 350-400 hp.
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Old 04-27-2010, 06:34 PM   #11
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Well there is always the Spec B axle option...which is the route I am going with my GC swap. I found a used set for $400, but they are around $700+ new.

Honestly this all depends on what you want out of the setup. Why is an R180 desired? If someone is going to buy new Spec B axles, or pay the coin to have axles modified to fit, then it is:

- almost cost effective to run an aftermarket R160 diff

- worth considering an JDM MLSD with JDM uneven length axles

- almost cost effective to run the 5x100 STI hubs/axles (JDM OR USDM) with 4/2 pots calipers and FHI Gravel rotors. This is especially good if you already have the 4/2 pots from your 06-07 WRX. This is, however, dependent on your patience and ability to find deals.

The easiest solutions are the Spec B axles and the aftermarket R160 diff. If I were racing the car in question, that would not even be a real question!!

To be fair I must consider the OPs solution. Even assuming a quality weld job,I do not this it will be cost effective considering 2 sets of axles will probably be required. I wonder if DSS used OEM parts and simply assembles them, or if they have to have something machined...I would hope the parts are custom machined for the price!!
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Old 04-27-2010, 06:51 PM   #12
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Quote:
Originally Posted by aboothman View Post
Well there is always the Spec B axle option...which is the route I am going with my GC swap. I found a used set for $400, but they are around $700+ new.
This is the first time someone in this thread has confirmed that the newer Legacy axles would work. So is it just the Spec B that has the R180, or is it any EZ30/EZ36 car? If it's the latter, then what model years? (I don't think the '01-04 EZ30 Outbacks had anything special in the drivetrain, but I don't know about later models.)

How do the axle lengths compare? I would think the Spec B axles would be too long for a "normal" car, but if you're already widening the rear end (with longer lateral links and flared quarters) then maybe that's not an issue.

Quote:
Originally Posted by aboothman View Post
Honestly this all depends on what you want out of the setup. Why is an R180 desired?
I think most people want the R180 diff because it's stronger, but I could be wrong.

In my case, it's because the car will be getting an EZ30R, which someday may get turbo'd, in which case having the stronger diff might be nice. Not to mention I'm sick of my R160 Cusco RS diff, and I have an '06 R180 sitting in my garage unused.

Quote:
Originally Posted by aboothman View Post
If someone is going to buy new Spec B axles, or pay the coin to have axles modified to fit, then it is:

- almost cost effective to run an aftermarket R160 diff
Going back to the strength issue, the aftermarket R160 diff doesn't really address that. Not to mention that even new axles at ~$700 are quite a bit cheaper than any of the aftermarket rear diff options.

Quote:
Originally Posted by aboothman View Post
- worth considering an JDM MLSD with JDM uneven length axles
What's that, and why would we want it?

Pat
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Old 04-29-2010, 02:07 AM   #13
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http://forums.nasioc.com/forums/show...=spec+b+legacy

give that thread a look. PDX claims to have done several swaps with Spec B axles with no length issues.

Otherwise I pretty much agree with all, I was just voicing some questions and stating my opinions on the issue. MY WRX received a full STI swap because of the cost issue, and my GC will be receiving Spec B axles because I want to use my WRX hubs with an 05 6 speed...and a 3.90 R180 with Spec B axles was the cheapest option
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Old 05-03-2010, 05:37 PM   #14
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Thx for the info guys. The Spec B axles sound exactly like what I need to get this diff in my car cheaply. After looking through the info in the thread linked above the axles seem to be a near enough bolt in option. At the most I would have to swap the outter cage for the cv's and thats not a problem
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Old 08-31-2010, 04:04 AM   #15
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any progress on this?
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Old 09-16-2010, 10:27 AM   #16
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Sorry posted my results in the other thread. Yes it is possible to use the spec b axles for the r180 swap. All I had to do to make it fit was swap the outter cv joints since the spec b axles had different outters and wouldn't fit into the wrx hubs. I hear some applications might not need to swap the outter joints but I am not sure which ones. Then the only other thing to make the r180 fit was I had to swap the driveshaft flange on the front of the diff since the r180 flange has a different bolt pattern.
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Old 09-18-2010, 11:05 PM   #17
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I got the parts from suberdave for the r180 conversion for wrx axles. Now if I could find a r180 3.54
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Old 09-24-2010, 12:24 AM   #18
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07 sti came with 3.54 thats what im using

Last edited by actafool2f; 09-24-2010 at 12:25 AM. Reason: typo
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Old 09-24-2010, 07:02 PM   #19
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For anyone reading this in the future, the best info available is contained in this thread:

http://forums.nasioc.com/forums/show...=spec+b+legacy
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