Subaru 27 spline stub axles

[Kenley]

I picked up an 04/05 R-180 STi rear diff with 3:90 ratio.  To fit this in my 4dr. 510, it requires new stub axles (27 spline).  Anyone know where to get a pair for a little better price that what Wolf Creek sells them for ($500/pr. not incl. shipping).  I was also wondering if there's anyway to adapt CV axles without the need for differential stub axles?  Custom axle/driveline shop might be able to do something, but I haven't been contacting any places.  I know that the CV conversions are available, but these use adapters to the existing hubs and stub axles where the half-shafts mate. If I wanted to get CV axles and the stub axles it's going to cost 1460 (from WCR).  I have yet to contact Troy at Ermish Racing, but thought I would post here first.

[Adam Walker]

I'm looking at going this route as well and it feels like the easy way to make this set-up work is to see if the Subaru CV shafts can be shortened.  If they can, contact Matt (Mattndew) and see if he can modify his CV adapters to work with the bolt pattern of the Subaru CV shaft.  From there, one would just need the diff, modified CV shafts and 2 adapters that would bolt to the 510 rear hub.

 

Am I missing something or would it be that simple?

 

Adam

On Wed, Sep 18, 2013 at 11:36 AM, Kenley <ken...@gmail.com> wrote:

I picked up an 04/05 R-180 STi rear diff with 3:90 ratio.  To fit this in my 4dr. 510, it requires new stub axles (27 spline).  Anyone know where to get a pair for a little better price that what Wolf Creek sells them for ($500/pr. not incl. shipping).  I was also wondering if there's anyway to adapt CV axles without the need for differential stub axles?  Custom axle/driveline shop might be able to do something, but I haven't been contacting any places.  I know that the CV conversions are available, but these use adapters to the existing hubs and stub axles where the half-shafts mate. If I wanted to get CV axles and the stub axles it's going to cost 1460 (from WCR).  I have yet to contact Troy at Ermish Racing, but thought I would post here first.

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[Kurt Hafer]

Hi Kenley,

 

Many folks have tried a variety of junkyard mix and match solutions.

By the time you're done it either doesn't work as well as you thought or requires additional mods that takes time and cost $$$.

The Realm and Ratsun have quite a few threads on a variety of variations.

It also depends on how much HP/TQ you have and what you plan to do with the car.  Toodling around town is different than drag strip use or track days.

 

The Beta Motorsports $500 stubs are really nice, and a great option, even if they are $500.  AFAIK, they're the only game in town.

You can choose a WCR CV setup, Troy Ermish CV setup, Driveshaft Shop CV setup, MattNDew spacers with DIY Ebay VW Bus CV kit and pay Dutchman to shorten the axles.

I looked into using shortened STi CV axles and redesigning the 510 rear hubs using STi front bolt on hubs (yes, front hubs), but never got deep into it.

But you might also ask the Driveshaft shop if they can make a CV setup for you that bolts to the 510 hub (outers), but uses a 27T splines (STi stub) for the inner CV to fit directly into your STi LSD.

If you get the length right, it should work just fine, and you eliminate 2 spacers and 8 bolts to loosen (or safety wire).

Hope this helps.  Let us know what you end up doing.

Best,

-Kurt

 

[Kenley]

Thanks Kurt!  My car is putting down around 210 whp (Dynojet).  One problem is I get lots of vibration from the stock half-shafts due to the lowered angle, hence I was looking to go the CV route. I emailed Steve Pepka from your Subaru LSD Diff FAQ for more details, not sure he's still selling the full CV axles at $650/pr.

While further researching, I found a post on Ratsun (with pictures), where Dutchman of Portland made a custom CV axle for R-160 (25T spline) that use 280ZX axles shortened and resplined, 280ZX outer CV joint and companion flange and Subaru inner CV joints. 

http://community.ratsun.net/topic/23651-fs-subaru-r160-lsd-with-custom-cv-axle/#entry335898

[Kenley]

Rats, Steve Pepka's email came back as non-deliverable.  He was using an AOL.com address, so it looks like he probably isn't using it anymore.  Is he a participant on the Bluebird list still?

[Kurt Hafer]

Hi Kenley,

I don't think Pepka has been making those for quite some time.  My web page is about 10yrs behind the times.

The hybrid homebrew CV creations using Subie cv at one end and 280zx cv at the other was attempted several times by Eric Straw (Spreadbury's R-hand partner on crime).  It kept failing.  Maybe he can fill in the details, but the mix of two different types of cv joint on the same shaft didn't play well together.  He ended up buying a Driveshaft Shop cv axle setup and has not looked back.

I wouldn't waste my time.  Do it right the 1st time.

Best,

Kurt 

Sent from my iPhone

[Desert Datsuns]

I'm kind of working on a similar issue, to make a Subie VLSD work with
M30 trailing arms. The easiest solution here seems to be shortening the
M30 shafts, and having one end resplined to work with the Subie CV at
the diff.

I could modify the Subie cage, by cutting the stub axle off, and then
welding on M30 cage to the Subie stub, which is what I originally had
mocked up, but you still need to shorten the shaft. So if I gotta
shorten it anyways, might as well just go the other route.

I just hate sending stuff out to be worked on, I wish I could do it myself.
Ryan Newman
Phoenix, AZ
71 510
81 280ZXT
06 Frontier

Kenley wrote:
> Rats, Steve Pepka's email came back as non-deliverable. He was using an
> AOL.com address, so it looks like he probably isn't using it anymore.
> Is he a participant on the Bluebird list still?
>
> On Thursday, September 19, 2013 2:13:28 PM UTC-7, Kenley wrote:
>

> <http://community.ratsun.net/topic/23651-fs-subaru-r160-lsd-with-custom-cv-axle/#entry335898>
>
>
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[DAT...@aol.com]

If I remember correctly the problem Eric had was the inner and outer CV's had differing numbers of balls which cause a vibration at speed.