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#Gear Ratio and LSD info

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PostPosted: Sat Jun 30, 2007 4:01 am 
Second Gear
Joined: Tue Jan 18, 2005 11:07 pm
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Location: Enfield, CT
A bit more information for the thread. A friend of mine is performing a v4 sti everything swap into his 95 impreza L. His tranny is as follows:

tranny code: TY752VBCAA

1st: 3.166
2nd: 1.882
3rd: 1.296
4th: 0.972
5th: 0.738

With a 4.444 final...Wacky

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PostPosted: Mon Oct 29, 2007 5:45 pm 
Third Gear
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Location: Casper, WY
Hey JOsh I was just doing some work to the mid late 90's Legacys with the 2.2 Na, for the 5mt's the final drives are 3.9, where the 2.5 were 4.11. I have had a few this week from 94-99 and the FSM was consistant to the above gears over that spread of years. Just thought I's add that...

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PostPosted: Thu Dec 13, 2007 8:41 pm 
First Gear
Joined: Thu Mar 24, 2005 7:22 pm
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Location: Twin Cities Metro, Minnesota
I don't know if you guy have been reading up on my posts over on NASIOC or RS25.

These are ALL 5-SPEEDs.
90-94 Legacy 5spd: 4.111FD
95-99 Legacy 2.2L; excluding 2.5L: 3.900
96-99 Legacy 2.5GT/Outback 2.5L: 4.111
93-95 Impreza 1.8L: 4.111FD
96-01 Impreza 2.2L: 3.900
98-01 Impreza 2.5L: 4.111
02-03 Impreza 2.5RS: 4.111
04+ Impreza 2.5RS SPORT: 4.111
02+ Impreza 2.5TS/OBS: 3.900
04+ Impreza 2.5RS(non-sport): 3.900

This is from my reseach thus far.

Mod edit: Changed years to 1990-1994 Legacy 5spd

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PostPosted: Thu Dec 13, 2007 9:24 pm 
Fifth Gear
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91-94 turbo legacys have a 3.9FD

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PostPosted: Thu Dec 13, 2007 9:25 pm 
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FD on a 1990-94 5MT fwd is 3.70. Turbo 5MTs are 3.90.

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PostPosted: Tue Dec 18, 2007 7:17 am 
In Neutral
Joined: Thu Dec 21, 2006 4:21 am
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Location: PNW
Anybody have information on the actual ratio's, like what Psychoreo posted a little while ago. I am interested to know each individual gear ratio. For a few Subaru gearboxes.

Any links or help would be greatly appreciated.


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PostPosted: Wed Jan 02, 2008 12:51 am 
First Gear
Joined: Thu Mar 24, 2005 7:22 pm
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Location: Twin Cities Metro, Minnesota
legasee wrote:
Anybody have information on the actual ratio's, like what Psychoreo posted a little while ago. I am interested to know each individual gear ratio. For a few Subaru gearboxes.

Any links or help would be greatly appreciated.

which ones are you looking at??

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PostPosted: Mon Jan 28, 2008 8:02 pm 
In Neutral
Joined: Mon Dec 11, 2006 3:07 am
Posts: 20
i have an auto 93..does anyone know what the ratio is because i want to find a 5 speed for it but i dont know what tranny to put in it..help please

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PostPosted: Mon Jan 28, 2008 9:48 pm 
Fifth Gear
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Location: North Idaho
Turbo or NA?

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PostPosted: Tue Jan 29, 2008 4:15 pm 
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srry...na

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PostPosted: Tue Jan 29, 2008 5:06 pm 
Fifth Gear
Joined: Fri Dec 26, 2003 6:37 am
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Location: North Idaho
You should be 4.11 I believe. Someone will pipe in and correct me if I'm wrong but I know that the 5sp AWD NA's are 4.11 and I'm very positive you are too.

On the back cover of the rear diff, likely under some road grime, is a ~1"x2" sticker that will verify that for you. Just wipe off the back and take a look.

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93' SS, 5mt swapped, 182k, not stock...
96' N/A OBW 5sp, 212k, Couple mods... RIP
99' N/A OBW, 4eat, mostly stock.


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PostPosted: Tue Jan 29, 2008 8:39 pm 
Fifth Gear
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Location: University Place, WA
It's 4.11

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PostPosted: Fri May 09, 2008 11:14 pm 
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Location: SFCA
I believe this thread is missing the most important information of all, a differential code translation matrix.

Often you get a differential and you can't be sure what vehicle it came from. Even then you never know if it was swapped at some time. Even with the older style units the foil sticker is sometimes missing and you are left to guess. I searched high and low for this info and so far i haven't found it. Instead I went out and manually measured a bunch of differentials myself.

Code - axle type - LSD? - size - ratio
HB - female axles - open - R160 - 3.9
BK - male axles - LSD - r160 - 4.11
EF - male axles - LSD - r160 - 3.54
TR - male axles - open - r160 - 4.11


From what I can tell all differentials at least from the first generation legacys have this code painted on them in multiple spots.

I also posted this information on nasty cock, see this link http://forums.nasioc.com/forums/showpost.php?p=22235523

Can we modify the first post to start to include these codes?

BTW, if anyone cares my frankendiff has been working for many years without issue. I took a 4.44 LSD and a 4.11 open differential and put the VLSD carrier into the 4.11 case.


Last edited by ciper on Fri Jun 06, 2008 9:56 pm, edited 1 time in total.

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PostPosted: Fri Jun 06, 2008 9:56 pm 
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I made a mistake on the last post (a very fuking time consuming mistake). The TR is actually an open differential.

Also on a different not this page has many transmission code numbers and specs!
http://spda-online.ca/modules/tinyconte ... tc_28.html


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PostPosted: Mon Jun 30, 2008 4:09 am 
In Neutral
Joined: Wed Jun 18, 2008 6:27 am
Posts: 3
lots of good info for manual trannys.

how about for those of us with auto's? mainly fd ratio's in what years.


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PostPosted: Wed Jun 17, 2009 8:52 pm 
quasi-mod-o
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i dont see the ratio for a 95 legacy awd auto...

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PostPosted: Thu Jun 18, 2009 4:12 pm 
Second Gear
Joined: Fri Sep 03, 2004 3:14 am
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Location: Armpit, USA
OK, according to this (pdf) the 1995 Legacy AT has a 4.111 FD, while the MT has 3.900 FD... Exact opposite of the first gens.

Thanks to kimokalihi for those manuals, see this thread for the others: viewtopic.php?t=40325

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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Fri Apr 02, 2010 10:41 pm 
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Location: Corvallis, OR 97333
http://www.gearhack.com/myink/ViewPage. ... on%20Chart

This one has a ton of gear ratios. Doesn't do automatics though.

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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Fri Aug 12, 2016 7:15 pm 
First Gear
Joined: Fri Mar 25, 2016 2:48 pm
Posts: 160
Location: Beautiful Downtown Goode, VA
i need a compatible replacement tranny for my 91 legacy l, given that the rear end is a 4.11 what transmissions are compatible?


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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Fri Aug 12, 2016 8:10 pm 
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All the 4.11 transmissions will work, until they got rid of the speedo gear in the transmission itself. So anything prior to 05 for legacys, and prior to 08 for impreza. If you are intending to keep the cable actuated clutch, then stick with 90s 4.11s for ease of swapping.

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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Fri Aug 12, 2016 9:30 pm 
First Gear
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Location: Beautiful Downtown Goode, VA
Many thanks Mike, anybody you know have a good one laying around they want to sell in decent shape?


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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Fri Aug 12, 2016 11:27 pm 
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The newer "phase 2" transmissions that appeared in the late 90s/early 2000s have twice as many bolt holes as the older stuff, but they still mount and bolt up just fine. That's what I'm using on my 92 Legacy, a 99 Impreza 8-bolt transmission.

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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Sun Oct 09, 2016 8:14 am 
In Neutral
Joined: Tue Jun 07, 2016 10:44 am
Posts: 11
Location: Des Moines, WA
I have a mt5 1993 legacy ss with a stock 3.90fd open diff. Can I swap in a 3.90fd 91/92 legacy ss vlsd using the rear axles already on my car?

If not, how hard is it to find the correct rear axle stubs? or is it possible to open up the axle housing and put the vlsd differential case into my open diff housing?

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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Sun Oct 09, 2016 6:36 pm 
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1. Only 91ss got vlsd, and 2. You need to get that Diff with the Stubs attached. Without the "unique to 91 VLSD diff only" stubs which are long out of production, the diff is useless. 3. Standard 90-94 legacy axles work.

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 Post subject: Re: Gear Ratio and LSD info
PostPosted: Thu May 18, 2017 7:54 pm 
Fourth Gear
Joined: Wed Sep 19, 2012 3:58 am
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Location: Plaistow,NH
94gt is 4.111 correct?

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