Uberoo Posted June 14, 2013 Share Posted June 14, 2013 Up until recently I was under the assumption that all automatic 89-94 AWD legacies had 4.11 gears.I need to replace the rear diff on my offroader because I grenaded it.So I thought I would go up to pull and save and grab one off an automatic legacy because the yards are littered with automatic legacies.However it was a different story when I got there.Every single auto legacy barring two 250K+ cars had 3.90 rear gears.Before that I had only seen 4.11 on automatic 1st gen legacies.So can anyone tell me if there is any rhyme or reason to which cars had 4.11's and which cars had 3.90's? Like I said up until recently I thought auto/turbo EA cars were 3.7,All other 4x4 EA stuff was 3.90,manual legacies were 3.90 and auto legacies were 4.11. Or did all of those auto have a 3.90 swapped in for some strange reason? Link to comment Share on other sites More sharing options...
CNY_Dave Posted June 14, 2013 Share Posted June 14, 2013 I know for gen2 outback autos got 4.44, legacy autos got 4.11. H6 outbacks got the 4.11. Does cars101 have gearing info? Link to comment Share on other sites More sharing options...
Fairtax4me Posted June 14, 2013 Share Posted June 14, 2013 Cars101 doesn't have that info. Like Dave says, a manual 96-99 outback will be 4.11, a manual 95-99 GT also has 4.11. Link to comment Share on other sites More sharing options...
Gloyale Posted June 14, 2013 Share Posted June 14, 2013 90-94 manual = 4.11 90-91 Auto = 4.11 92-94 auto = 3.9 1 Link to comment Share on other sites More sharing options...
mikaleda Posted June 14, 2013 Share Posted June 14, 2013 (edited) Yep I have a Manuel first gen with 4.11 that's my 90 My mom has had two first gen autos one 90 4.11 one 91 4.11 Edited June 14, 2013 by mikaleda Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted June 14, 2013 Share Posted June 14, 2013 About this: ... I thought auto/turbo EA cars were 3.7,All other 4x4 EA stuff was 3.90 ... I've seen Rear LSD Differentials on Gen II Leones (EA81's) with 3.889 ... ... "Almost" 3.90, isn't it? Kind Regards. Link to comment Share on other sites More sharing options...
CNY_Dave Posted June 14, 2013 Share Posted June 14, 2013 jeszek, if you want to talk about oddball stuff, - you can pull the viscous unit from the manual trans and use higher-numbered gears in the rear (4.44 instead of 4.11 for example) to bias the torque to the rear - there is a variety of subaru front diff with a non-viscous limited slip and what i am hoping ends up being my oddball - you can put the VDC center diff into a non-VDC 4EAT trans and get an all-the-time 45/55 torque split (no VDC, and maybe a manually lockable AWD clutch) 1 Link to comment Share on other sites More sharing options...
johnceggleston Posted June 14, 2013 Share Posted June 14, 2013 (edited) i'm pretty sure gloyale is right. but to be sure, check legacy central. http://bbs.legacycentral.org/viewtopic.php?t=32148 what ratio do you need??? 95 - 99 will bolt right in and both 3.9 and 4.11 were used then too. Edited June 14, 2013 by johnceggleston Link to comment Share on other sites More sharing options...
Gloyale Posted June 14, 2013 Share Posted June 14, 2013 i'm pretty sure gloyale is right. but to be sure, check legacy central. http://bbs.legacycentral.org/viewtopic.php?t=32148 what ratio do you need??? 95 - 99 will bolt right in and both 3.9 and 4.11 were used then too. I think he needs from 90-94 so it has the male stubs. 95+ use the female type where the axle ends stick into the diff. Link to comment Share on other sites More sharing options...
Gloyale Posted June 14, 2013 Share Posted June 14, 2013 (edited) About this: I've seen Rear LSD Differentials on Gen II Leones (EA81's) with 3.889 ... Hmm......That sticker doesn't say 3.889. Why does he think that's the ratio. I'm pretty sure it's just regular ole 3.9 I can't even figure out what combo of # teeth R+P would make 3.889? Ring gears range from 37 teeth to 42 pinions range from 9-11 No combination of these would yeild 3.889 A 17 tooth pinion with a 66 tooth ring would be almost 3.889....but not quite even..3.882...and there is no way you can fit a 17/66 tooth ring & pinion into a r160 Anybody got any documentaion or explanation? Edited June 14, 2013 by Gloyale Link to comment Share on other sites More sharing options...
CNY_Dave Posted June 14, 2013 Share Posted June 14, 2013 3.889 would be so close anyway I think you could drive pavement all day every day and it would be no nevermind. Link to comment Share on other sites More sharing options...
CNY_Dave Posted June 14, 2013 Share Posted June 14, 2013 A 9/35 gives 3.888888888888, is that in the realm of possibility? That's get written 3.889. Not a lot of pinion teeth though, but I do see planty of examples on the net (nissans, toyotas). Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted June 15, 2013 Share Posted June 15, 2013 (edited) Hmm......That sticker doesn't say 3.889. Why does he think that's the ratio. I'm pretty sure it's just regular ole 3.9 ... A 9/35 gives 3.888888888888, is that in the realm of possibility? That's get written 3.889. ... Sorry for Hijack the Thread. See this post: Caboobaroo, I make 3.90 LSD rear diffs all the time, I just replace the open diff in the 3.90 with a LSD diff from a 3.70. It bolt right up to the ring gear so it if a simple conversion. There is some grinding required to the housing though. I really doubt if you or anyone else could tell the difference between a 3.889 and a 3.90. In fact I bet if you count the teeth on the Datsun/Nissan you find it has the same as the Subaru. Subaru just choose to round it up, and Datsun didn't. Taken from this thread: http://www.ultimatesubaru.org/forum/topic/12263-lsd-on-gen-1-brat/?do=findComment&comment=104047 This is LeoneTurbo's Build Thread, with more Photos: ~► http://www.ultimatesubaru.org/forum/topic/109465-84-4wd-wagon-new-daily-driver-with-future-ej-swap/ Kind Regards. Edited June 15, 2013 by Loyale 2.7 Turbo Link to comment Share on other sites More sharing options...
Gloyale Posted June 16, 2013 Share Posted June 16, 2013 (edited) A 9/35 gives 3.888888888888, is that in the realm of possibility? That's get written 3.889. Not a lot of pinion teeth though, but I do see planty of examples on the net (nissans, toyotas). Seems like a very low # on the ring gear. But I suppose it could be. I have alot of old Fuji literautre and NEVER seen a listing of 3.889. But I guess I can't say for sure it doesn't exist. I really doubt if you or anyone else could tell the difference between a 3.889 and a 3.90. In fact I bet if you count the teeth on the Datsun/Nissan you find it has the same as the Subaru. Subaru just choose to round it up, and Datsun didn't. Subaru didn't just round up. All 3.9 ratio diffs I've taken apart, and all in the literature, are a 39/10 ring pinion count......exactly 3.9 Edited June 16, 2013 by Gloyale Link to comment Share on other sites More sharing options...
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