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Old 08-17-2002, 02:43 PM   #1
Hojai
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Default Parts needed for a JDM WRX tranny?

i am deciding to get a JDM WRX tranny from Japan and put it into my GC8. But, what parts do i need except the whole tranny itself?

is this like putting a STi tranny into a GC8??
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Old 08-17-2002, 05:12 PM   #2
amelnikov
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Isn't WRX trans the same as RS tras just different final drive ratio?
n
It would be less money to just get a trans from a local yeard from an RS. If you really want to jet a JDM trans get an RA version. It has heat treated gears and close ration.
You will need to get the trans, drive shaft, matching rear end ( to get the same ration as the front), flywheel, clutch and slave mechanism. And the pedal for the clutch. Basially everything that automatic equipped car does not have.

Alex...
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Old 08-17-2002, 06:15 PM   #3
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but i am talking about the JDM WRX, not the USDM WRX....
they are the same?
isn't that RA version is STi?
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Old 08-17-2002, 06:27 PM   #4
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There's a RA version that's not STI also. Likely for all the trouble your going to go through you might as well get the dog gears or hope somebody wrecks an STI when it comes out. With as many people that have wrecked their WRX it shouldn't take long to wreck a few STI's.
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Old 08-17-2002, 08:09 PM   #5
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but if i decided to get the JDM WRX tranny or RA version from Japan, do both of these require the same parts like a STi tranny?
(trans, drive shaft, matching rear end ( to get the same ration as the front), flywheel, clutch and slave mechanism. And the pedal for the clutch)
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Old 08-17-2002, 08:10 PM   #6
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or the JDM WRX tranny can bolt on to a RS?
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Old 08-18-2002, 12:27 AM   #7
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Quote:
Originally posted by Hojai
or the JDM WRX tranny can bolt on to a RS?
My jdm WRX tranny is a 4.111 final drive. Some STi's and RA's are 4.444. If you source a 4.111 tranny, you won't have to change out your rear diff.

Note: I'm not sure how this works with the push/pull type clutch issue. Your RS flywheel probably bolts up to the WRX tranny, though. A search would confirm or refute this.'

I'm strongly considering a ver 5 or 6 RA tranny, as my next stage of mods will push me toward 400 bhp. Maybe you'd be interested in my jdm WRX tranny?

Only problem with the RA tranny is I don't have the cash to also upgrade my diffs to a 4.444 ratio.
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Old 08-18-2002, 03:58 PM   #8
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so if i decided to get a JDM tranny, i should get the RA version instead of the normal JDM WRX or STi 5 speed right?

annointed:
so your JDM WRX tranny is stronger than those USDM WRX or RS trannies, right?
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Old 08-18-2002, 03:58 PM   #9
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so if i decided to get a JDM tranny, i should get the RA version instead of the normal JDM WRX or STi 5 speed right?

annointed:
so your JDM WRX tranny is stronger than those USDM WRX or RS trannies, right?
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Old 08-18-2002, 05:50 PM   #10
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They are the same thing. JDM doesn't mean anything when talking about the M/T unless your actually meaning to ask about the STI RA trans or the STI 6spd. Look at the shaft that comes directly from the clutch and motor. The initial gear is tiny and the trans only uses a two shaft setup with only two bearings to the shaft. There actually is no bearing for the first 8inches or so of the shaft. Only the one bearing right before the gear which means all the load that would cause flexing is placed on the one bearing and 1 inch section of aluminum casing. Its just not a very practical layout. Not to mention the bearing is very small. If there was a bearing closer to the front of the shaft, larger bearings and a more practical design of 1st gear then it likely wouldn't happen. Maybe size up the gear on the first shaft and size down the gear on the second shaft. As is the gear from the second shaft destroys the first one.
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Old 08-18-2002, 05:51 PM   #11
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Oh and that black part at the front of the shaft isn't abearing its just a rubber seal to keep dirt out.
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Old 08-20-2002, 01:23 AM   #12
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Nice pic. I'd love to see a pic of an RA tranny cracked open to compare. And a 6 speed, too.
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Old 08-20-2002, 02:06 AM   #13
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parts needed

Slave Cylinder
Clutch Hose(for WRX)
Clutch for WRX
Throwout bearing for WRX
Possibly a flywheel(the one i used was the LEgacy turbo)

make sure you get one with a 4.11 final drive.

jeremy
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Old 08-20-2002, 03:44 PM   #14
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thanks.....
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Old 08-20-2002, 03:45 PM   #15
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Quote:
Originally posted by HndaTch627
parts needed

Slave Cylinder
Clutch Hose(for WRX)
Clutch for WRX
Throwout bearing for WRX
Possibly a flywheel(the one i used was the LEgacy turbo)

make sure you get one with a 4.11 final drive.

jeremy
Jeremy beat me to this one....it was my car that the tranny went into. I had to get a rear diff also due to the ratio change, but you'll be fine with an RS.

how much are you looking to spend on the whole thing? I've done some looking into prices for various parts you'll need.

Alan
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Old 08-21-2002, 09:34 AM   #16
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Just a comment I've been wondering about out loud myself...

Wouldn't it make more sense (if you have someone comfortable doing such things), to just take the ring and pinion/output shaft in your RS tranny and put it in the RA tranny with the RA output gears?

What I'm getting at is... that way you don't need to buy a new rear diff, driveshaft or half shafts to match the 4.11 ratio. Just replace the 4.44 front diff with your 4.11. That is what the real problem.

Added bonus- you get to have a good look inside your (new to you) tranny and maybe replace a synchro or two and give it a good cleaning before you slam it back in there.

Cracking the tranny can be somewhat daunting for some, but it would seem like a lot less trouble working on the tranny on the bench than wrestling diffs and whatnot under the car and worrying if all those parts are going to fit back together.

The converse of this would be to take 4.44 ring and pinion from an auto RS rear diff and switch them to your 5sp rear LSD. Now diffs seem a bit more difficult (dealers don't even service them, just swap them) but its also just a thought.

Kyle

Last edited by kyledooley; 08-21-2002 at 03:41 PM.
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Old 08-22-2002, 01:12 PM   #17
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OK - this is the straight scoop:

An RS tranny and WRX tranny are totally different animals. WRX ones are mcuh stronger units.

That being said there are standard WRX trannies (let's call them JDm for now, though many otehr countried got them too), WRX RA trannies, WRX Sti trannies, WRX STi RA trannies, and then a few others that make the name look like alphabet soup. The best one for you depends on your budget, willingness to swap parts and of course, existing or planned mods to your car.

Your car has a 4.11 rear, meaning that the easiest swap is going with a tranny that has a 4.11 internal gear ratio. These can found in many WRX's from Japan and elsewhere as well as some STi RA's up to '97 as I recall. All that is needed is the WRX tranny, clutch, flywheel, clutch line, master and slave cylinders.

Most of the later model (97 and newer) WRX trannies are 4.44 units. There are exceptions of course, but they are so rare that they usually aren't obtainable and thus not worth mentioning.
To fiot a tranny with a 4.44 internal ratio, you need all the parts above plus the rear, driveshaft,rear axles and couplers. Not a har swap at all, just a bit labor intensive...everything goes into place perfectly though, so no fabrication needed at all.

The nicest trannies are of course STi units, as most feature hardened gear sets and some feature better cases as well.
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Old 08-23-2002, 05:48 PM   #18
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about how much can a used sti 5 speed be had for? for year...which ever one had the strongest gears.
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Old 08-25-2002, 02:05 PM   #19
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bump
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Old 08-26-2002, 01:59 PM   #20
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Default About That Clutch Pedal

I've just put a JDM tranny/motor/rear end in my 93 Impreza.
Can't seem to get any agreement on which hydraulic clutch pedal assy. will be the right one. Which did you use? Where can I get one? Dealer is no help. Running out of wrecking yards to call....
Have the slave (new from Japan!) and master cyl.
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Old 08-26-2002, 02:33 PM   #21
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Default Re: About That Clutch Pedal

Quote:
Originally posted by Fritz
I've just put a JDM tranny/motor/rear end in my 93 Impreza.
Can't seem to get any agreement on which hydraulic clutch pedal assy. will be the right one. Which did you use? Where can I get one? Dealer is no help. Running out of wrecking yards to call....
Have the slave (new from Japan!) and master cyl.
ANY Subaru hydralic clutch will work as long as you have the slave cylinder....I paid $ 100 for the pedal assembly & master cylinder found it through here (in NE I think)
good luck
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Old 08-26-2002, 06:20 PM   #22
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Prices vary greatly from a low of around $2000 (tranny alone) and go from there. The year of the tranny and spec of the car it came out of dictates how much other stuff you need. Prices go up to about $6000 (for a very late model soup to nuts setup with clutch/flwheel, diffs, axles, couplers, etc.) or so, again depending upon spec and mileage
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