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Old 06-28-2003, 05:12 PM   #1
limeylight
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Default diff ratio

Anyone tell me what my diff ratio would be in my 97 manual Outback?
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Old 06-28-2003, 08:52 PM   #2
outback2.5HO
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4:11s are stock.
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Old 06-28-2003, 11:06 PM   #3
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a manual trany should be 3.9

auto would be 4.11
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Old 06-29-2003, 12:20 AM   #4
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4.11 is correct for the outback manual.
4.44 would be an auto
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Old 06-29-2003, 01:37 AM   #5
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damn outback, has to be different dos'nt it!
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Old 06-29-2003, 09:27 AM   #6
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of course it does
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Old 06-29-2003, 11:30 AM   #7
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So what are my chances of finding an LSD for it?
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Old 06-29-2003, 04:00 PM   #8
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I just took a 4.44 LSD and mixed it with a 4.11 open diff from the junk yard and made a 4.11 LSD for my legacy

I think it would be ALOT easier to find a 4.44 lsd, especially since the 4.11 diffs are damn near impossible to find at any decent price.
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Old 06-29-2003, 05:54 PM   #9
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So are you saying you built a 4:11 LSD from 4:44 LSD by swapping parts?

Is this easy to do?
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Old 06-29-2003, 07:51 PM   #10
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Pretty easy, the only hard part was finding an E-10 socket to removel the axle stubs on the open differential.

Remember that the Ring and Pinion are a matched set. Even if the two pinions have the same number of teath you still have to use them in a set. I remember reading that someone got lazy with a front differential conversion and thought that tooth count was the only concern. Now the car is constantly grinding the gears

Read about it here http://bbs.legacycentral.org/viewtopic.php?t=1462 I plan to put some pictures and instructions later.
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Old 06-29-2003, 09:39 PM   #11
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did the 5mt ob with 4.11 gears have a hydro clutch? i need to do a mt swap in my 95 turbo and wanted to run 4.11 years for a faster run at the track.
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Old 06-30-2003, 12:12 PM   #12
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limeyllight,

It shouldn't be that hard to find a 4:11 w LSD at a wrecking yard. They came in '00-'01 RS's, '00 Newer Forester S's w 5 speed, and '01 newer Outbacks w/ 5 speeds. I got mine out of a '00 RS for $350. There are LOTS of smashed RS's out there.

subiekid,
yes, the MT outback trans w/ 4:11s came with a hyrdro clutch, I would switch it to cable (with earlier MT cable set up) if you plan on racing it so you can adjust it after it gets smoked a few times... With the hydro you are screwed as far as adjustments go, and clutches for them aren't cheap. I do have a close ratio 5 speed RS tranny (30k miles) w/ rear diff for sale if you are interested.
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Old 06-30-2003, 04:32 PM   #13
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How much?
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Old 06-30-2003, 06:10 PM   #14
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outback2.5HO: You may be able to find many LSD from later cars but how does the Axle Stub/Axle connection work? In mine the stubs are COMPLETLY different and I have read about later models needing different axles because of increased spline count.
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Old 06-30-2003, 06:37 PM   #15
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Oh Yeah,

Forgot to mention that... The inner spline count on the axles are different, but you can utilize the ones that came off of the parts car...'00 RS rear diff, '00 RS rear axles, etc..We've even put a 1996 OB trans/rear diff into an early Legacy using the same technique, it works slick. Also much less labor intensive than building your own...I've heard about doing that, but haven't tried yet.
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Old 06-30-2003, 06:53 PM   #16
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outback2.5HO

one reason why i wanted to stay with the hydro clutch is because this is going to bolt up to my ej22T transplant. with all my mods i hope to get about 300 hp at the crank. that is a lot of hp to be using a cable clutch. i would much rather use a cable because it would be so much easier to install. rightnow i have an ej22t hook up to my stock 4eat from my 95. i thought the rs had a hydro clutch? how much? is it 4.11? do you have axles? driveshaft?
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Old 07-01-2003, 01:15 PM   #17
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The tranny/diff set up is a close ratio 5 speed out of a '99 RS w/30k miles. Called the parts yard yesterday and they wanted $1250 for both the trans and diff without axles. I'll take $1000 for mine, which also has no axles... The axles shouldn't be too hard to find or too much $ though.
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Old 07-01-2003, 02:56 PM   #18
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Doesnt my 97 GT have the 4.11 gearing too but no LSD?

What is the gearing on the WRX? Is it a LSD?

ss
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Old 07-01-2003, 03:30 PM   #19
outback2.5HO
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Yes, it's got 4:11s but no LSD...

The WRX has 3:90s but has a tailshaft reducer (or something like it) that makes it 3:54 w/ LSD.
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Old 07-01-2003, 04:45 PM   #20
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Quote:
Originally posted by outback2.5HO
Yes, it's got 4:11s but no LSD...

The WRX has 3:90s but has a tailshaft reducer (or something like it) that makes it 3:54 w/ LSD.
Thanks for the info 2.5HO, can you explain this tailshaft reducer to me? Is that at the rear of the transmission? Does that mean the rear diff is running 3.54 gears too?

You know, this may sound crazy but I would rather have that setup. I kinda tired of listening to the droning of 3500rpms at 80mph on the interstate. And my highway mileage is crap. My gf's 3.2TL is turning about 2200rpms in 5th gear at 80mph and shes getting 30mpg on the highway(not to mention the car has 225hp.) I got rpm envy I tell ya.

I think I may try a trans/diff swap on my car if I can find a WRX donor vehicle.

ss
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Old 07-01-2003, 05:15 PM   #21
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I thought the WRX AUTO had 4.111? Not sure how easy it is to install though.

Didnt the GT or RS of 98 or so get a rear LSD? If so could he just use those parts for a drop in swap?


The combination of the center differential and the rear differential results in a final drive of 3.9:1 . The rear differential itself is like the SVX.
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Old 07-01-2003, 05:32 PM   #22
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Subysouth,

That doesn't sound crazy to me at all. The 5 speeds with 4:11s should have a better overdrive or a 6 speed. It is a giant pain in the butt turning so many rpms on the highway (and getting 20-24mpg), I wish my car had taller gears for the road trips, but still like the zip of shorter gears. My wife's 96 auto OB gets about 28-32 on the highway, but is also bone stock too. Very hard to believe that an auto gets better mileage AND has a shorter gear ratio (4:44), but that's due to a proper overdrive. For what you are trying to do, either the WRX trans or a Legacy L 5 speed w/3:90s, or a Turbo Legacy 5 speed would work well.

On the tailshaft reducer issue, it is coming out of the rear of the trans to the rear diff, just not sure exactly how it works...Pretty sure you wind up with 3:54 (w/ a 3:90 diff) as the final drive though. You'd be spinning about 2500 rpms or so at 75, that should save lots of fuel over stock..
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Old 07-01-2003, 05:40 PM   #23
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Quote:
Originally posted by outback2.5HO
Subysouth,

That doesn't sound crazy to me at all. The 5 speeds with 4:11s should have a better overdrive or a 6 speed. It is a giant pain in the butt turning so many rpms on the highway (and getting 20-24mpg), I wish my car had taller gears for the road trips, but still like the zip of shorter gears. My wife's 96 auto OB gets about 28-32 on the highway, but is also bone stock too. Very hard to believe that an auto gets better mileage AND has a shorter gear ratio (4:44), but that's due to a proper overdrive. For what you are trying to do, either the WRX trans or a Legacy L 5 speed w/3:90s, or a Turbo Legacy 5 speed would work well.

On the tailshaft reducer issue, it is coming out of the rear of the trans to the rear diff, just not sure exactly how it works...Pretty sure you wind up with 3:54 (w/ a 3:90 diff) as the final drive though. You'd be spinning about 2500 rpms or so at 75, that should save lots of fuel over stock..
I think I'll try to secure the parts and wait for my current clutch to go. Should be worth the effort, I spend a lot of time on the interstate. I wonder if first gear will be any taller. I like the zip, but I go through first gear to quickly. I hope first is taller too.

ss

The Legacy Ls have the cable operated clutches too dont they?
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Old 07-01-2003, 06:17 PM   #24
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ciper,

Don't think you could get the RS or GT in 98 with the LSD in the rear, if so that would make things easier.

As far as the tailshaft reducer goes, the WRX rear diff is a 3:54 (like SVX) and the center diff gears (reduction) makes it a 3:90 final drive?
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Old 07-01-2003, 07:47 PM   #25
ciper
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Yes, I only know that from reading this site though (dont own one). Many different sources have said the same thing though. The transmission or even better conversion forum would be the first place to look
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