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Options for a 4.44 with LSD


dwarlick

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You may have seen my Z432 tribute project in the RB section where I will be using a RB20 which has been back dated to triple carbs.  As some of you know  z432 came with a rare Nissan R190 differential with a 4.44 gear ratio.  The RB20 setup I am doing will have similar rev characteristics to the S20 and I would like to have rearend gearing to mimic the driving experience as close as possible.

 

So what are my options?

 

Yahoo Auctions Japan has a R190 listed currently for $1,500 plus shipping.  The picture is not detailed and who knows what kind of condition it is in or if it even is what the seller claims.  http://page10.auctions.yahoo.co.jp/jp/auction/m129326383   

 

Another way to go would be a Subaru Sti R180 LSD with the Wolf Creek side axles.  There are a few of these on ebay but I have a few questions:

 

Are my options limited as to which Subaru R180's came with 4.44 and LSD?

 

Do I want a CLSD or would a VLSD work just as well for my application and is that even an option?

 

Do I want 2 or 4 pinion and again does it matter?

 

 

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Yep....in addition to the Subie R180s, they came with R160s in 4.44.  Seem to be readily available on eBay and the various Subaru blogs.  I would think the "Suretrac" or clutch-LSD would be preferable to VLSD, especially in an R160.  

 

Occasionally, old R180s pop up on the web in 4.xx ratios, but not too often; and when they do, they are usually snapped up pretty quick.

 

I went with a Subaru R180 (Torsen-style LSD) recently, and am very pleased with the set-up.  Here's a couple links that may be helpful to you:

 

http://forums.nasioc.com/forums/showthread.php?t=1969700

 

http://legacycentral.org/library/literature/differential.htm#Which Subarus do I look at to find an LSD

 

http://forums.nasioc.com/forums/showthread.php?t=2597453

Edited by jhm
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The front diff on some of the 720 trucks with 4x4 is an R180 and has a 4.375 ratio, I'm pretty sure that the ring and pinion is the larger 115mm size, which I think fits into the subaru sti diff. So you could pick up a STI diff and try to find a 720 R&P to swap in.

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