VitaminZ Posted July 8, 2014 Share Posted July 8, 2014 (edited) Hey guys , looking to swap my diff to the Subaru R180 3.9 , I currently have one available to purchase but Im not sure if its the right year and model . I know the diff should off a US 04-05 STI , but the diff I am getting is off a 02 JDM STI 3.9 , I'm just trying to ensure this diff is not a Viscous LSD and IS a Clutch type or Torsen . Or if there are specific number stamps on the ring gear I should be looking for ? I cant really tell the difference hence why I am seeking your knowledge on this . There are a few pictures attached , not sure if this helps . Any help is greatly appreciated , thanks . Edited July 8, 2014 by OldschoolZ Quote Link to comment Share on other sites More sharing options...
johnc Posted July 8, 2014 Share Posted July 8, 2014 That's a viscous diff. Quote Link to comment Share on other sites More sharing options...
VitaminZ Posted July 8, 2014 Author Share Posted July 8, 2014 Thanks John Quote Link to comment Share on other sites More sharing options...
VitaminZ Posted July 9, 2014 Author Share Posted July 9, 2014 how about this one is this a clutch type , also can someone give me some insight as to how I may easily spot the differences , thanks. Quote Link to comment Share on other sites More sharing options...
jhm Posted July 10, 2014 Share Posted July 10, 2014 These may help: http://thefactoryfiveforum.com/showthread.php?13240-A-spotters-guide-to-Subaru-differentials 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=1969700 Quote Link to comment Share on other sites More sharing options...
VitaminZ Posted July 10, 2014 Author Share Posted July 10, 2014 (edited) These may help: http://thefactoryfiveforum.com/showthread.php?13240-A-spotters-guide-to-Subaru-differentials 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=1969700 thanks a lot for this really helped , seems like the first diff I posted here which is kinda hard to tell from the photos is a clutch type lsd , looking through the hole shows the clutch packs , going through the first link you posted even the cover compared to the CLSD cover in the link looks the same . The viscous type looks much different as well as the cover . But John did say it was a viscous , not sure where im going wrong here . Edited July 10, 2014 by VitaminZ Quote Link to comment Share on other sites More sharing options...
VitaminZ Posted July 10, 2014 Author Share Posted July 10, 2014 well I have confirmed it is a clutch type lsd in the first set of photos , not sure why John thought it was a viscous Quote Link to comment Share on other sites More sharing options...
jhm Posted July 10, 2014 Share Posted July 10, 2014 Glad it helped. Quote Link to comment Share on other sites More sharing options...
johnc Posted July 10, 2014 Share Posted July 10, 2014 My mistake. The 2002 STi used a viscous rear and I only saw one break line in the pic above through the side opening. Quote Link to comment Share on other sites More sharing options...
VitaminZ Posted July 10, 2014 Author Share Posted July 10, 2014 My mistake. The 2002 STi used a viscous rear and I only saw one break line in the pic above through the side opening. no worries John , thanks anyways Quote Link to comment Share on other sites More sharing options...
wesmc Posted July 17, 2014 Share Posted July 17, 2014 John- Are you still doing the stubs for these? I've been off here for a long time. Quote Link to comment Share on other sites More sharing options...
wesmc Posted July 18, 2014 Share Posted July 18, 2014 Mine is now a dedicated track car, I have a 3.9 WRX STI CLSD ready to drop in but I'm wondering if it is better to use the Subie diff or weld the open diff? I have never driven a car with a welded diff but more than one guy has said that on a track car a welded diff is preferable. So welded vs CLSD? Quote Link to comment Share on other sites More sharing options...
johnc Posted July 18, 2014 Share Posted July 18, 2014 Todd at Wolf Creek Racing is now selling the STi/S30 side axles. Quote Link to comment Share on other sites More sharing options...
wesmc Posted July 18, 2014 Share Posted July 18, 2014 Thanks...just ordered. Looking forward to not having to modulate so much. Quote Link to comment Share on other sites More sharing options...
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