dwarlick Posted September 12, 2014 Share Posted September 12, 2014 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? Quote Link to comment Share on other sites More sharing options...
Josh280z Posted September 12, 2014 Share Posted September 12, 2014 I think Subaru makes a 4.44 rearend. Quote Link to comment Share on other sites More sharing options...
jhm Posted September 13, 2014 Share Posted September 13, 2014 (edited) 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 September 13, 2014 by jhm Quote Link to comment Share on other sites More sharing options...
ArizonaZ Posted September 15, 2014 Share Posted September 15, 2014 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. Quote Link to comment Share on other sites More sharing options...
gnosez Posted December 13, 2014 Share Posted December 13, 2014 R180 SX diff (raised K on the top of the diff) has 4.375 gearing w/115mm ring. Order a Quaife and you won't have to worry about clutch packs or heat. Warrantied for life whether you use it on the street or track. Quote Link to comment Share on other sites More sharing options...
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