The AUSubaru.com.au Forums

Specifically the gear ratio?

This is what's believed to be an ej d/r from the land of Oz. Thanks.



I know what it's not. . . http://www.northursalia.com/techdocs...rannychart.pdf

For one second I thought it was an Forrester Box from around 1996 but the number is wrong.. I know that 1996 Forrester with 1.447:1 reduction gear was TY752XH1AA.. sorry I'm not much of help. But only one thing is for sure its AWD box from EJ series.
Cheers
AP

Transmission identification codes start with a "T" and an example would be:

TY856WB1AA

"T" = transmission code

"Y" = that it is a manual awd gearbox

"85" = the transmission classification...in the case of manual gearboxes this number indicates the gear shaft spacing in millimeters. 6-speed transmissions use an 85mm shaft spacing while the current generation of 5-speed transmissions use a 75mm shaft spacing.

"6" = some reference to the transmission case. "6" is used for 6-speeds, "4" is used for 8-bolt 5-speeds, "2" for 4-bolt Impreza 5-speeds, "5" for Forester 8-bolt 5-speeds, "3" for 4-bolt Forester 5-speeds, and "7" for some Legacy turbo 8-bolt 5-speeds.

"W" = transmission specification. "W" is 6-speed, "V" is 5-speed, "Z" = AT with MPT, "Y" = AT with VTD, etc.

"B1AA" = indicates various details about the equipment such as center diff. type, front LSD, etc. and also about minor production changes.

I am looking for your code

Its a 1992 gen 1 series 2 d/range 3.9 final ratio from what I can work out

so have you a rear diff for this ?

seagull wrote:Its a 1992 gen 1 series 2 d/range 3.9 final ratio from what I can work out

so have you a rear diff for this ?

Yep correct, it is I just looked up on my papers...

You will need 3.9:1 ratio rear diff then you'll be all sweet!
Cheers
AP

AlpineRaven wrote:For one second I thought it was an Forrester Box from around 1996 but the number is wrong.. I know that 1996 Forrester with 1.447:1 reduction gear was TY752XH1AA.. sorry I'm not much of help. But only one thing is for sure its AWD box from EJ series.
Cheers
AP

Ap this code ( box ) if I am correct came out in a gen 1 gx 4wd liberty as well .that was in 1991 .Is this reduction sort after ???

o and final drive was 3.9 rear ?

seagull

The low range reduction is not good. 1:1.192 compared to the Forester Impreza reduction of 1:1.5. This is the box that every one pulls apart and fits the L series low range and 4.111 diffs to.

BYB-01 wrote:The low range reduction is not good. 1:1.192 compared to the Forester Impreza reduction of 1:1.5. This is the box that every one pulls apart and fits the L series low range and 4.111 diffs to.

Awesome, If I know I can do that, then I'm even happier. By "L" you mean Loyale/ea82correct? Those are a dime a dozen around here still.
Can I push my luck and try for 4.44?

Thanks everybody for the info. It's just plain non-known here.

You can do the 4.444 as well. With both the 4.111 and 4.444 you have to machine the outer edge from the crown wheel. Once you take the 3.9 crown out you will see that it already has an extra taper on the outer edge. Once you put the L series low range gears in there the tolerances are even tighter between the crown and the gear set, so it must be done. You don't need to worry about the case hardening so much as that part of the teeth doesn't do a great deal any way. It is really only the outer edge.

Also I think the 4.444 is about 1.5.. thicker where the crown bolts on. From memory you have to machine that 1.5mm off the back face of it. Other wise when you try to set up your backlash on the diff the bolts on the crown wheel actually hit on the case.

seagull wrote:Ap this code ( box ) if I am correct came out in a gen 1 gx 4wd liberty as well .that was in 1991 .Is this reduction sort after ???

o and final drive was 3.9 rear ?

seagull

It would be 1.19:1 reduction gear.
Cheers
AP

Zap, the box I used in combination with the FT4WD box was a 1989 gen 1 series 1 with a 3.9 ratio. IIRC the gears (except for fifth) were all the same as the FT4WD box (from japan.) Your series 2 might be different but I doubt it. So your ratios are probably the same as an RX FT box. Not sure if you wanted the "gear ratio" or "diff ratio" so I thought I'd add this.
In my huge post over at USMB (not sure if you remember it) there is some info and pictures on what is needed to fit the 1.59 to 1 EA82 low range into the Liberty D/R gearbox like you have.

BTW, for all those people wanting to know the diff ratio in their gearbox that is sitting in the shed or what ever (out of the car) you can just stick it in 4th (normally a 1:1 gear in 5sp boxes) and rotate the input shaft until the diff does a complete turn. Count the turns there you have it.

Actually 4th gear is not direct in L or early EJ boxes . The closer or carby L / NA AWD Lib ratio 4th is a very slight underdrive and the RX and RS Turbo ratios 4th is a slight overdrive . Admittedly the differences are really small at 1.088:1 and 0.972:1 so 0.116 the difference .

Cheers A .

This is really cool info, I really apreciate it. Thanks you guys.

discopotato03 wrote:Actually 4th gear is not direct in L or early EJ boxes . The closer or carby L / NA AWD Lib ratio 4th is a very slight underdrive and the RX and RS Turbo ratios 4th is a slight overdrive . Admittedly the differences are really small at 1.088:1 and 0.972:1 so 0.116 the difference .

Cheers A .

That's weird as I put an input Liberty gearset shaft up against an RX output gearset shaft and it matched right up, first to 4th and reverse all looked good. Didn't end up running the box like that though, cos I didn't need any of the Lib gear, just the case.

It sounds like you put a Liberty mainshaft up against an RX L's counter shaft/layshaft .

These transmissions are not like most front engined rear wheel drive cars , they are indirect as opposed to direct . What this means is that drive comes in through the front of the mainshaft and out through the back of the lower countershaft so excepting for reverse only two gears are driving things .
What Subaru did to get drive up higher for the rear tailshaft was use a pair of transfer gears up to a separate stubby output shaft .
This allowed them to drive the front and rear diff's from the countershaft instead of the back of the mainshaft like RWD gearboxes do .

The breakthrough was making the countershaft hollow so it could turn at a different speed to the front diff pinion and therefore allow differentiation between the front and rear diffs and AWD via a center differential .

Cheers A .

Yeah, sorry. My use of words was poor and I don't think you understood. Don't worry about it. I'm pretty sure Zap only wanted the diff ratio anyhow.

Phizinza wrote:Yeah, sorry. My use of words was poor and I don't think you understood. Don't worry about it. I'm pretty sure Zap only wanted the diff ratio anyhow.

Yeah, originally, so I could make sure I had the right rear diff. But, with all this new (to me) info, I guess I'll be looking for a 4.11. Thanks.