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Old 11-10-2004, 05:06 PM   #1
555ideways
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Default Open diff to LSD help

looking into upgrading the rear open diff in my 95 impreza to a LSD unit. What is the cheapest and easiest way to do this? Is there another model that came with the same gearing and uses the same axles? I did a search and found a bunch of stuff for 98 RS swaps but nothing for the 95L. thanks in advance.

-Paddy
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Old 11-10-2004, 05:27 PM   #2
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Old 11-10-2004, 06:47 PM   #3
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Those phantom grips are garbage and will chew up your diff. pretty quickly. They also don't exert a whole heck of alot of force, so if you are doing the types of things that cause the rear tires to break loose, that force will almost instantly overcome that unit. Save your pennies for a proper LSD.
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Old 11-10-2004, 10:49 PM   #4
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A used LSD rear diff is cheaper than those things too!!!
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Old 11-11-2004, 07:29 AM   #5
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Quote:
Originally Posted by 555ideways
looking into upgrading the rear open diff in my 95 impreza to a LSD unit. What is the cheapest and easiest way to do this? Is there another model that came with the same gearing and uses the same axles? I did a search and found a bunch of stuff for 98 RS swaps but nothing for the 95L. thanks in advance.

-Paddy
first, find out what final drive ratio you have. MOST (not all) 2.2l had 3.90's, and MOST 1.8l had 4.11, so which do you have? it's an easy swap.(go factory. I agree with no-coast-punk on this one...) should take about 3 hours, unless your lateral link bushings are siezed and the spindle.
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Old 11-11-2004, 03:10 PM   #6
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ok my plan was to pick up another subaru diff from the junkyard, i just needed to know which ones will bolt up without issues. i'll try to dig up some info on my final drive ratio. just so we're clear - it's a impreza L 1995 1.8NA. thanks for the support
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Old 11-12-2004, 11:13 AM   #7
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it looks like it's a 3.90 final drive, just like the usdm wrx 2L Turbo manual. just not positive on that number. has anyone tried this before? i find it a little hard to beleive.
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Old 11-12-2004, 11:24 AM   #8
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the 1.8l should have 4.11 ratio. reason being is that the smaller motor needed quicker gearing to make up for the lack of power. here's a test for you, what rpm's are you running in 5th gear @ 80mph? if you are around 4k, it's 4.11 if you're around 3k, it's 3.90. i've had both ratios in my car, and that's what i've found.
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Old 11-12-2004, 02:00 PM   #9
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Some things to think about.
First, AT and MT are different ratios. What's yours?
Second ,often WRX guys confuse their overall ratio and actual differential ratio as there is a reduction gear in the WRX tranny.
Third, When your in the junk yard look for the silver sticker that says LSD, pull it off before you go to the counter.
Fourth, Think about swapping in the pumpkin. No fear of the wrong ratio. Here is some info that may help.
http://www.legacycentral.org/library...fferential.htm
WRX viscous LSDs are easier to find. I believe you need to grind a little in the differential housing for clearance when installing the wrx pumpkin, plus you will need the stub axles. One more thing, in MA plan on your transverse bushings being frozen

Last edited by John*G; 11-12-2004 at 02:17 PM.
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Old 11-12-2004, 02:36 PM   #10
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the lateral link bushings at the bottom of the spindle? damn straight. all mine except for one are frozen. figures it had to be the last one I loosened. none of the others dropped, so I didn't expect it to drop till it whacked me in the nose....OUCH
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Old 11-12-2004, 03:31 PM   #11
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the car is a manaul 1.8L i feel like i'm closer to 4K rpms than 3K going 80mph in fifth gear. just from memory. i can pay more attentin next time im on the highway obviously. so if i find that my final drive ratio is 4.11, then all i have to do is find another diff with the same ratio and bolt the thing up? John - are you saying i need to replace the both axles if i go WRX LSD? stub axles?? don't know what you mean.

and yes a few of those bushings are seriously frozen. i wrestled with them for a half an hour - and nothing was moving. the car almost fell of the jackstands. so sketchy. what's the strategy for getting them loose?
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Old 11-12-2004, 03:48 PM   #12
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WRX axles slide into the differential, Axles male, Diff female. L differentials have little "stub axles" that stick out of the diff. The axles slide over. Diff male , axles female.
To remove frozen transverse links I have had to use a lot of heat. Good time to press in hard bushings as the old ones get cooked.
I not sure but I think most people try to find the older clutch style pumpkins to upgrade the L's. Harder to find as you are competing with the Datsun crowd. The people racing WRX's seem to go with aftermarket lsd's.

Last edited by John*G; 11-12-2004 at 04:01 PM.
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Old 11-12-2004, 05:06 PM   #13
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my L differential has nothing sticking out of it. i just slide the axles into the female diff. there are C clips holding the axles in, that's it. There is one thing i know about here and this is it-

the 95L open diff is female the axles are male - just like the US WRXs

if the WRX axles and diff are the same style - male/female and the ratio is the final drive ratio is the same will this work?
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Old 11-12-2004, 08:41 PM   #14
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I think all Subaru diffs are interchangable
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Old 11-13-2004, 02:53 PM   #15
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The final drive of the WRX rear diff is 3.545 because of a 1.1:1 transfer case reduction. AFAIK the Impreza L always had a 3.900 final drive.

-Wes
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Old 05-01-2014, 07:12 PM   #16
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Hey sorry to bring up a thread that's from 2004 but this site won't let me start a thread until I make some legit posts.

So here it goes. I just got into rallying and I have a 98 subaru impreza 2.5rs. I wanted to change the rear diff from open to an LSD unit.

I went out and found my self a viscous lsd from a subie guy who said it would work with my impreza. He told me the diff/carrier was off of a 91 legacy turbo automatic. My plan was to just use the ring and pinion from my open diff and switch it in.

Well in the middle of the swap I realized that the diff from the legacy as axle stubs. My impreza axles don't have the same spindle to go into the lsd. I am unable to find any axles that will work for me at this point. Does anyone know witch ones I need? Someone told me a wrx wagon but it wasn't that easy to walk in a parts place and ask for that. I'm guessing years and what not are different.

Any suggestions would be great and if you could leave year/model I don't know if AT/MT matters
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Old 05-01-2014, 10:47 PM   #17
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You need axles from that Legacy also. If my old man memory serves, 90-94 Legacy axles will work for you. They will look like front axles but obviously be meant for the stubs on that diff. You have the stubs with the diff, correct?

Jay
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Originally Posted by Red 5 View Post
Hey sorry to bring up a thread that's from 2004 but this site won't let me start a thread until I make some legit posts.

So here it goes. I just got into rallying and I have a 98 subaru impreza 2.5rs. I wanted to change the rear diff from open to an LSD unit.

I went out and found my self a viscous lsd from a subie guy who said it would work with my impreza. He told me the diff/carrier was off of a 91 legacy turbo automatic. My plan was to just use the ring and pinion from my open diff and switch it in.

Well in the middle of the swap I realized that the diff from the legacy as axle stubs. My impreza axles don't have the same spindle to go into the lsd. I am unable to find any axles that will work for me at this point. Does anyone know witch ones I need? Someone told me a wrx wagon but it wasn't that easy to walk in a parts place and ask for that. I'm guessing years and what not are different.

Any suggestions would be great and if you could leave year/model I don't know if AT/MT matters
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Old 05-02-2014, 12:20 AM   #18
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Ya I have the stubs. Here's the thing I went to Napa today and bought legacy axles and went to go install them. I was confused when the stub ends spun loose in the inner cv joint.. Also the hub end spline diameter was bigger then my hubs on the impreza. I thought there was some mistake so I took them back. The guy told me that's there was no mistake and that's what a 91 L axle was. He also told me that the axles are interchangeable from legacy to impreza.

Well this isn't so for me. I'm starting over and I'm going to guess the guy I got the rear end off of doesn't know anything.(kind of like me)

So this is what I know about the rear end. Yes it is an lsd it's 3.90 and I know I have stub shafts. Someone told me to check out some 2002+ impreza axles. Still any help would be nice
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Old 05-02-2014, 12:24 AM   #19
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Any place to buy a good aftermarket diff for a 98 impreza 2.5rs
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Old 05-04-2014, 09:02 PM   #20
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I used to have pics of this stuff on my now dead desktop. The stubs are hollow and are secured by bolts that thread into the diff, right?
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Originally Posted by Red 5 View Post
Ya I have the stubs. Here's the thing I went to Napa today and bought legacy axles and went to go install them. I was confused when the stub ends spun loose in the inner cv joint.. Also the hub end spline diameter was bigger then my hubs on the impreza. I thought there was some mistake so I took them back. The guy told me that's there was no mistake and that's what a 91 L axle was. He also told me that the axles are interchangeable from legacy to impreza.

Well this isn't so for me. I'm starting over and I'm going to guess the guy I got the rear end off of doesn't know anything.(kind of like me)

So this is what I know about the rear end. Yes it is an lsd it's 3.90 and I know I have stub shafts. Someone told me to check out some 2002+ impreza axles. Still any help would be nice
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