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Old 01-23-2004, 11:14 AM   #1
Geoff
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Question '01 RS Tranny vs. STI Type RA Tranny

On the quest to have the OBS's 2.2l replaced with a 2.0l USDM WRX engine, I've been reading in various posts that the RS tranny is about as reliable as the WRX's tranny. (I'm guessing 2003)

I've got the tranny out of an '01 RS in my OBS including rear LSD. The only problem I'm having is that the fourth gear sychro grinds a bit when at about 5500RPM, shifting into 5th.

That being said, would I be better of keeping my gearset and having the 4th gear syncro replaced, or replacing it with the STi Type-RA tranny? What are the advantages/disadvantages of one over the other?

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Old 01-23-2004, 11:52 AM   #2
stimpy
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It's a no brainer really; if you have the money then go with a Type-RA or better.

Here's why:
The RS and WRX gears are really no different aside from gear ratios. There are bonuses in having the 4.111 final drive of the RS, but that can be changed on a WRX transmission. Type-RA is typically a better final drive but will probably be changed if you convert your RS tranny to it. From gear to gear it will be better ratios as well.

The real difference is in the gears themselves. The Type-RA has hardened gears that are significantly stronger than the gears we get in the WRX or the RS. It may not take the abuse of serious horsepower, but it is a good step in the right direction.

Your problem sounds a lot like the problem I had in my 2000 RS. It turned out there was a nut inside the transmission that was improperly torqued causing excessive wear on the 5th gear synchro. At higher RPMs, the shift from 4th to 5th caused grinding. It was fixed under warranty, but that's not exactly useful to you

-Jon
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Old 01-23-2004, 12:02 PM   #3
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Quote:
Originally posted by stimpy
Type-RA is typically a better final drive but will probably be changed if you convert your RS tranny to it. From gear to gear it will be better ratios as well.

Jon -
From what Rallispec told me, lots of people have been happy keeping the 3.9(?) final drive in their WRX and moving to the Type-RA gearset. Granted the Type-RA is normally running a 4.44 final drive, teh 4.11 should be excellent from what I'm told. I just haven't seen any figures or posts anywhere that've shown that the STi gearset is any stronger than what we have here. Logic would state that it would be, but logically the WRX would have a stronger gearset than the RS...which isn't the case.

Oddly, the RS tranny didn't feel much different than my OBS tranny before it...though having the rear LSD is nice.
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Old 01-23-2004, 12:15 PM   #4
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Quote:
Taken from www.rallispec.com
Factory Ver.6 STi and STi RA 5-speed close ratio gearsets with special cryogenic stress relieving treatment. Improved strength and durability over stock WRX components. 1st & 2nd gear width increased by approx. 1mm vs. standard WRX. Gear tooth root thickness also increased substantially on most gears as shown in the picture. Excellent for mildly tuned street and group N competition vehicles.
There have been other threads, but I can't find them right now.

The rear LSD had a profound difference on my EJ22 and WRX transmission. I could forsee me blowing up an open diff with my EJ20 now, though. Now I want a front LSD

-Jon
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Old 01-23-2004, 02:03 PM   #5
Subie Gal
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i've been there done that

boyfriends car
we cracked open his OE tranny

and replaced the gears with STi gearset.

my god there is a MASSIVE difference guys...
gears in the STi tranny are 10x thicker...
damn i should have taken photos.. i know i know...

what rallispec has stated is spot on.
this gearbox went into an SCCA Rally car that's rallied HARD!
no issues or problems to date (1.5 years later!)

hope this helps.
Jamie
www.subiegal.com
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Old 01-23-2004, 04:09 PM   #6
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Quote:
Originally posted by Subie Gal

my god there is a MASSIVE difference guys...
gears in the STi tranny are 10x thicker...
damn i should have taken photos.. i know i know...

hope this helps.
Jamie
www.subiegal.com
So is this a vote from Jamie to go with the Type-RA gearset?
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Old 01-23-2004, 05:30 PM   #7
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Here is what Jamie is talking about.


(Photo from Rallispec)

I'm planning on the STi ratio instead of the RA.
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Old 01-24-2004, 09:21 AM   #8
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here is a question I have, not to highjack the thread but on the topic of trannies. anyways here goes, with a 2.5 tranny. what is the max power or daily drivable power with a USDM WRX conversion can it handle? Thanks
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Old 01-24-2004, 01:14 PM   #9
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From what I've heard (and witnessed) lots of it has to do with both the transmission's initial build quality and your driving style. More the latter than the former usually. I've heard of people breaking both with stock power (both the RS and WRX trannies) yet others who mod their RS and WRXes up big-time and still have their stock trannies. Sorry I don't have an answer...I'd say it depends.

I initially asked my question because I know the WRX and RS trannies are of the same caliber...was curious as to if the STi-RA tranny is really that much stronger. I guess it is.
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Old 01-25-2004, 11:10 AM   #10
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OMGHi2U RA Trannies

We have Taken Sti and WRX Trannies apart Sti gears are not only Thicker and beefer the Metal has been harden, and it take alot to destroy!

If your thinking about Swapping to a RA Remember All RA we get have the DCCD electronic center diff. Another Bonus!
Kevin
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Old 01-25-2004, 12:07 PM   #11
Geoff
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Default Re: RA Trannies

Quote:
Originally posted by gr8wheels
We have Taken Sti and WRX Trannies apart Sti gears are not only Thicker and beefer the Metal has been harden, and it take alot to destroy!

If your thinking about Swapping to a RA Remember All RA we get have the DCCD electronic center diff. Another Bonus!
Kevin
Actually, I'm planning on having Rallispec install the RA gearset into my RS transmission housing. It's a bit more economical than going with an all-out RA tranny.
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Old 01-27-2004, 12:55 AM   #12
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OMGHi2U

Here Kitty kitty kitty.

No Really Very cool! you will be happy!!
Kevin
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Old 01-27-2004, 02:40 PM   #13
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Quote:
Originally posted by gr8wheels
Here Kitty kitty kitty.

No Really Very cool! you will be happy!!
Kevin
That is, unless you can get me a Type-RA tranny with DCCD for $1500-$1700.
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Old 01-27-2004, 02:40 PM   #14
Geoff
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Quote:
Originally posted by gr8wheels
Here Kitty kitty kitty.

No Really Very cool! you will be happy!!
Kevin
That is, unless you can get me a Type-RA tranny with DCCD for $1500-$1700.
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