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'98 2.5 RS
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Discussion Starter · #1 ·
what trannys will swap directly (ie. plug and play) to an oem '98 2.5 rs?
the reason i ask is because i keep reading about the trannys on the 98-01 rs scratching gears and my has begun to do that. a friend of mine told me that subie solved this problem in the 03+ cars.

ive searched the forum and didnt exactly find the answers i needed. so what i want to know is:

-is it true that the 03+ trannies are stronger and need less babying? (used to have a honda, and in my experience they will take EVERYTHING you can throw at it)

-is there are stronger oem tranny i can bolt up to my stock 98 rs motor?

thanks
 

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1998 Subaru Impreza RS - RBP
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1,605 Posts
Or you could have different gears thrown in your current tranny. Some nice PPG gears or something similar. :)
 

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'98 2.5 RS
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763 Posts
Discussion Starter · #3 ·
how much would that cost me? and would it gaurantee that i never have to worry about my tranny again?

i open to ideas other than a newer oem tranny, but i figure it would be the cheapest and easiest way to get the job done.
 

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92 Crown Vic
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629 Posts
i got a 98 rs too. i think there isn't a plug and play, only if you swap gears. but that takes a while. personally i want to swap the sti 6 speed trans. but that a big swap from what i hear. axles drive shaft, mounts, rediff. maybe someone has more info on it.

james
 

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stm99,flatblack99,07sti,blk98
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i did a whole 05 wrx drivetrain into my 99rs. get clutch and flywheel for that specific year trans and car. everything bolts up fine. 2 neutral position sensors on the side bc wrx's have an intergrated harness as the rs has 2 seperate plugs for it. vehicle speed sensor is excatly the same unplug the rs one and plug it into the wrx trans. axles may be a different. 05 one i have are male axles to female transmission. rear diff was the same way. 2 guide pins are on the transmission of the wrx as the rs has the guide pins on the shortblock, just pull out the transmission guide pins and done. rear diff mouns are all the same. hubs on a sti are different and require the sti lateral arms i belive as for the front..i think the shocks bolt in different places too on the hubs i think there lower if i believe so..
 

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'98 2.5 RS
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763 Posts
Discussion Starter · #7 ·
by "drivetrain" do you mean rear diff as well?
 

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i did a whole 05 wrx drivetrain into my 99rs. get clutch and flywheel for that specific year trans and car. everything bolts up fine. 2 neutral position sensors on the side bc wrx's have an intergrated harness as the rs has 2 seperate plugs for it. vehicle speed sensor is excatly the same unplug the rs one and plug it into the wrx trans. axles may be a different. 05 one i have are male axles to female transmission. rear diff was the same way. 2 guide pins are on the transmission of the wrx as the rs has the guide pins on the shortblock, just pull out the transmission guide pins and done. rear diff mouns are all the same. hubs on a sti are different and require the sti lateral arms i belive as for the front..i think the shocks bolt in different places too on the hubs i think there lower if i believe so..
I'm a moron when it comes to swaps, I've personally never swapped anything out for anything else for/from a different car and I'd ideally like to swap the "completely ruined*" 5 speed I have in my 98 RS for whatever Subaru 6 speed I can find from the junkyard/cheaply because hey, it's already wrecked, why not make it more awesome while I'm at it?

So I basically need the full drivetrain from whatever car I buy, including the driveshafts, and the clutch & flywheel from the same car? What do I need to get/salvage from my 98 RS to make the swap happen? It's a stock motor and I plan on keeping it that way until I go back to work/inherit a large cash sum, will doing a trans swap screw me on that in the long run?

I know it would be easier/cheaper to just put newer, more bad-ass gears into my stock trans but I'd feel cooler with a six speed and I have nothing but time on my hands due to this economy and frigid winter weather in Milwaukee.




* Clutch all the way to the floor, gear in neutral, engine sounds fine, no goofy "metal popcorn" noise. Doesn't want to go into first or second really, but I was able to convince it to go into gear. Still in neutral, foot off the clutch, I hear the most terrible noise I've ever heard a car make besides "SCREEEECH... SMAAASHHHHHHH" that I can only describe as "metal popcorn." I was able to creep it into a parking lot and had it towed home, and attempting to drive it into the garage after a three day sit in the cold, it would go a couple of feet, stop suddenly, and I had to let the clutch spin around for a second or two to get it to move another few feet. I figure that second gear is in multiple pieces and unfortunately I've yet to drain the gear oil out so I don't know for certain. I doubt the clutch would stop the car completely like that causing me to smash my face on the steering wheel.
 

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99' Subaru Impreza 2.5 Rs
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Make sure it's a 4.11 final drive to match your rear. You can switch to a wrx 3.90 if you swap the rear over too. That'll make your car slower though. If you do go that route make sure you have the proper clutch in because one is a push type and one is a pull type.
 

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2001 Subaru RS 2.5
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126 Posts
So from my understanding all you need for a 6 speed swap is drive shaft clutch and flywheel? Im also trying to throw in a 6 speed from an STI to my RS. I plan on doing a full STI swap down the road but why not get the trans now to start out.. haha. let me know what you found out for sure.
 

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99 white GF8
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580 Posts
So from my understanding all you need for a 6 speed swap is drive shaft clutch and flywheel? Im also trying to throw in a 6 speed from an STI to my RS. I plan on doing a full STI swap down the road but why not get the trans now to start out.. haha. let me know what you found out for sure.
You're gonna need more than just that. If I recall, you need all 4 hubs, rear diff, and all axles. And at that point you might as well get the brakes. And if you get the brakes you'll need wheels to fit over the brakes.

IMHO, you should wait until you do the full sti swap, no sense in tearing out that much of the car if you're gonna do it again later down the road.
 

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2001 Subaru RS 2.5
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126 Posts
alright thanks. i was just trying to get things piece by piece. but i guess in the long run getting the full swap would be best. i just never have 5 grand laying around at one time
 

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2000 Impreza 2.5RS BRP
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You're gonna need more than just that. If I recall, you need all 4 hubs, rear diff, and all axles. And at that point you might as well get the brakes. And if you get the brakes you'll need wheels to fit over the brakes.

IMHO, you should wait until you do the full sti swap, no sense in tearing out that much of the car if you're gonna do it again later down the road.
This isn't entirely necessary to get a six speed in. If you find a WRX R160 rear diff of the correct final drive, you can run the six speed with an auto driveshaft to the WRX rear diff and use your axles and hubs.

If you choose to run the STI R180 in the rear, you have two options as well: STI axles and hubs or Drive Shaft Shop adapter axles with your stock hubs. The adapter axles are extremely expensive.

For the front hubs and axles, you can use your stock axles and hubs, but depending on the STI trans you get, you may need to add '04 STI axle stubs, seals, and circlips to allow you to attach your female axles to the '05-'07 STI trans.

For the most part, using STI hubs requires using STI brakes. That's why people usually recommend to convert from the flywheel all the way to the wheels.

I will be using my stock front hubs and axles, an '07 STI flywheel, clutch, trans, driveshaft, R180, and rear axles, '04 STI axle stubs, seals, and circlips, GC R180 rear hubs, and my existing 4/2 pot brakes so that I can stick with my existing wheels and 5x100 bolt pattern.

Sorry for the essay!
 

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2001 Subaru RS 2.5
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126 Posts
Sounds like a lot of upgrading for one transmission. I think it would just be easier to get the full swap. I appreciate all the details, if I do decide to do the 6 speed I will for sure refer back to this.
 

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1999 Impreza RS - WRB
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504 Posts
I will be using my stock front hubs and axles, an '07 STI flywheel, clutch, trans, driveshaft, R180, and rear axles, '04 STI axle stubs, seals, and circlips, GC R180 rear hubs, and my existing 4/2 pot brakes so that I can stick with my existing wheels and 5x100 bolt pattern.
I take it you're running Group N rotors for those hubs then?
 

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2000 Impreza 2.5RS BRP
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3,567 Posts
I actually have JDM Ver. 6 rotors, but those are the same dimensions as the Group N rotors. My replacements will be the Group N.
 
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