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MyEnquiringMind

R180 4.4 Ratio Lsd, Crown And Pinion. (Or Similar)

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Hi Folks,

 

I am looking for either the GC8 WRX R180 4.4:1 LSD, or a long nose R180 crown and pinion gear set with the 115mm inside diameter (out of a K box) with a similar ratio. I am currently running a 4.1 and looking to go a little shorter ratio, so will consider 4.4 or 4.6 if someone has a diff/crown and pinion available.

 

Cheers, Jarrod.

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That diff ratio is out of a very specific model GC8 - STi version 6 Type RA in case you didnt know.

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Not sure if that is a sarcastic thanks or not. I just know because this is the diff i have in my car. Don't forget to get a new speedo pinion.

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not a sarcastic thanks buddy, I am genuinely keen to find one of these and appreciate the response... and also the comment Re: change of speedo pinion, I have previously tried Courtesy Nissan in the states, but no luck... do you know where I could find a speedo pinion d3c0y?

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I just know because this is the diff i have in my car. Don't forget to get a new speedo pinion.

 

I seem to recall a discussions on this conversion. Is there a thread that details what's involved to make it work in an S30z?

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not a sarcastic thanks buddy, I am genuinely keen to find one of these and appreciate the response... and also the comment Re: change of speedo pinion, I have previously tried Courtesy Nissan in the states, but no luck... do you know where I could find a speedo pinion d3c0y?

 

I got mine from Chesapeake Nissan. They have a great list of parts on eBay and you can just message them direct with specific requests. It's the the purple one fwiw.

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G'day Jarrod

Do you plan on running the beta Motorsport side axles, which suit the Subi diff?

I have a 4.6:1 ratio diff which I got from the front end of a 720 4x4. It is a "K" housing and needed a slight amount of massaging inside the case to fit a Subi LSD centre. Also had to make up some shims to cater for 11mm bolts in 12mm holes.

Might be a cheaper option?

 

Gav, here's a thread on the Subi diff although mostly discussing cv options.

http://www.viczcar.com/forum/topic/9243-subaru-sti-r180-lsd-into-240z/

 

Cheers

Mick

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Hi Mick,

 

yeah I already have the axels, I picked them up from a bloke David from Gympie.

 

http://www.gumtree.com.au/s-ad/east-deep-creek/engine-engine-parts-transmission/datsun-subaru-r180-27spline-adapters-diff-half-shaft/1084823021

 

I have already got a 4.8 Datsun diff (Quaife LSD) in the shed at home, but in the early stages of this build, I was going to try and find something a bit more streetable, i.e. 4.1 or 4.4 and see what that was like...

 

Thanks for taking the time to reply...

 

Cheers, J

 

P.S. after pulling the rear cover off, I am now aware that the R180 in situ is in fact a 3.5 and not a 3.9 or 4.1 as expected... so i'll be happy to take a 4.1 if anyone has one spare... (oops...)

Edited by MyEnquiringMind

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Thanks Roberto, unfortunately my current diff is niether LSD, nor 4.1... (read above).. nor am I feeling that rich... looks like I might have to get Craig Ford to go on the hunt for me...

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Cool

I have a 3.9 as well as the 4.6. The 3.9 is a good street application (especially if you do significant highway driving) and the 4.6 is great for the shorter tracks like Wakefield or the Amaroo circuit at SMSP.

I imagine the 4.1 would be a good compromise and make your car a lot more spritely over the 3.5.

 

I'm sure the rally boys would be interested in the 4.8 LSD.

 

Good luck with it

Mick

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4.6 and 4.8's are common, in utes.

The Nissan R180 in 4.375 was a Nsmo Competition part,,and rather rare, even 30 years ago.

The higher number of pinion teeth give it better reliability compared to 4.6-5.1's

 

Yes, easier to source a Subaru version, ex Japan, then change the stubs. Check with SWM he was getting a better quality stub made, as, in severe use ( rally/circuit) SWM found the Beta stubs were failing.

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I was looking at those axels too, they seem to be well made!

 

Yeah Jason, there's been a few issues with those billet 'wolf creek/beta axels recently on Hybridz.

 

If you can spare the coin, get the gear set isotropic finished. I did mine and it's the most quiet diff I've ever heard.

Edited by Gareth. J.

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How strong are the Subaru R160 LSD's? For a road car it could be ok...

 

On Hybridz there's guys running LS1's with Subi R180's and they break the billet axels not the diff.

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Yep, I have just done one of these conversions. The Subaru R180 diffs come up on eBay periodically from Jap parts importers. The ratio is 4.444 to 1 and they come in either a clutch pack or Torsen style torque sensing LSD. The later are more prevelant but in my opinion less desirable. They come up for around $600. The SWR axles are fine but you need R200 half shafts. The 4.4 ratio is a good all rounder

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The SWR axles are fine but you need R200 half shafts. The 4.4 ratio is a good all rounder

What's the difference between the R180 & R200 half shafts?

I didn't know SWR was making the stub axles but no doubt they will be a top notch product as usual.

 

Cheers

Mick

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Yep, I have just done one of these conversions. The Subaru R180 diffs come up on eBay periodically from Jap parts importers. The ratio is 4.444 to 1 and they come in either a clutch pack or Torsen style torque sensing LSD. The later are more prevelant but in my opinion less desirable. They come up for around $600. The SWR axles are fine but you need R200 half shafts. The 4.4 ratio is a good all rounder

 

They aren't all the same ratio. The Suretrak torque sensing diff is the most common, has a 3.9:1 ratio and is the most common. The GDB STi Spec-C also came with a 3.9 but is mechanical type LSD. The later GDG has the Torsen diff and is a 3.5:1 ratio.

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Purple is the 4.375 - but things obviously can change with wheel size... from experience, I installed the Subaru 4.44 and used the purple... forgot about rim size. Ended up going to the next one up "orange" Speedo cog to get it right.

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