RebekahsZ Posted April 23, 2012 Share Posted April 23, 2012 (edited) I'm collecting diffs for my LS2 project. Currently installed in my car is a STi R180 3.90 CLSD and 1st gear is kind of pointless, so I'm thinking about putting together a combo that has higher gearing. The T56 gearing is so close from 1st to 2nd that the shift light just stays on even though I've shifted up a gear! The picture shows, starting on the left: 3.90 CLSD, 3.70 CLSD, 3.54 Open. The 3.90 and 3.70 were purchased from Hybridz forum members while the 3.54 open was given to me by a friend who I share my old L24 parts with. Supposedly it was from a 1988 Z31 Turbo - it was supposed to be a LSD, but at least the axles were right. Anyway, if you compare the photos of the ring gears, the 3.54 open looks like varnish was sprayed into it. There is a yellow-ish tint to the entire inside of the diff. Also, when I try to turn the input flange, it kind of sticks or hangs up, then rotates freely, but with a little roughness, when compared to the LSDs. Do you think the open diff got hot, causing the discoloration? Simply aged oil? I was kind of hoping to swap one of the LSD units into the 3.54 in order to get high enough gearing to use 1st gear occasionally. I'm also wondering if it is worth the trouble to replace the bearings in the 3.54 - may be a heck of a lot of work. The browser posted the pictures in a different order: left is the inside of one of the LSDs (they both look great even though they were sold to me by different members), then all three diffs on the bench, then two shots of the interior of the open diff in question. If I can't figure this out, I may just shoot in the middle and start prepping the 3.70 for the time being. What do the sages of HybridZ recommend? Keith Edited April 23, 2012 by RebekahsZ Quote Link to comment Share on other sites More sharing options...
getoffmyinternet Posted April 23, 2012 Share Posted April 23, 2012 They normally turn kind of golden brown when they get old from the oil. I imagine somebody used an additive that caused it to turn yellow, I don't think there's any copper or bronze etc. in there. Quote Link to comment Share on other sites More sharing options...
BluDestiny Posted April 23, 2012 Share Posted April 23, 2012 The teeth look fine so its probably just old dry oil scum Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted April 23, 2012 Share Posted April 23, 2012 (edited) That's from the oil and it was probably pretty new oil. Edited April 23, 2012 by HowlerMonkey Quote Link to comment Share on other sites More sharing options...
johnc Posted April 23, 2012 Share Posted April 23, 2012 Looks like they used Redline Shockproof gear oil. Its an ugly babyshit yellow color. Quote Link to comment Share on other sites More sharing options...
Kris.Is.Awesome Posted April 23, 2012 Share Posted April 23, 2012 The yellow stuff is usually used to set gear lash. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted April 23, 2012 Author Share Posted April 23, 2012 With 3 diffs open in my shop the whole place smells like baby shi- . Ok. Sounds like the color is ok. Now, where to order bearings? Where to order the yellow paint stuff for setting lash? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted April 23, 2012 Share Posted April 23, 2012 That ball bearing on the pinion is Nissan only, and it's probably the only one that needs replacing. I would pull the pinion and take a look at the others. If you do need them, I can probably get the correct Koyo bearings for you, I would have to check. My suppliers sell Koyo, but it's mostly Toyota truck diff stuff, so the particular ones you need may or may not be common. The problem with checking beforehand is that the pinion bearings changed somewhere along the way. Safest way to go is to pull the pinion and then check the numbers on the bearings directly. I can send you some gear marking compound along with bearings too, or you can get it from Jegs or Summit, etc. Quote Link to comment Share on other sites More sharing options...
RebekahsZ Posted April 23, 2012 Author Share Posted April 23, 2012 Thanks everybody. Got my info now gotta find some time. Quote Link to comment Share on other sites More sharing options...
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