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Old 07-02-2007, 01:18 PM   #1
STi Hunter
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Member#: 58131
Join Date: Mar 2004
Chapter/Region: NWIC
Location: MT
Vehicle:
05 STi 6,879 miles
04 Forester XT

Default V8 6 speed into 1998 OBS questions

I'm about to install the 6 speed into my 98 OBS and would like to know run through a list of items to find out what else I will need prior to tearing the car down to find out I'm missing something.

The facts:

Car: 98 OBS 5 speed, completely stock w/ 3.9 ring and pinion in
the rear differential according to info I found on Nasioc
for stock 98 2.2l 5 speed Imprezas.
Transmission: JDM V8 6 speed 3.9 ratio and w/ 6 speed tranny mount
Driveshaft: V8 6 speed driveshaft
Clutch: Stock V8 that came with the tranny
Flywheel: Stock V8 that came with the tranny
Pilot Bearing: Stock V8 that came with the tranny
Release Bearing: Stock V8 that came with the tranny
Front Axles: Stock WRX with the female ends (tranny has the stubs)
Front Hubs: Stock WRX

From what I've read around here I'll need 4 quarts of tranny fluid. It also appears fluid brand is highly debated so we'll skip that portion of this discussion. We'll also skip DCCD discussion as I will be installing an aftermarket DCCD controller at a later date. I believe the parts listed are the heavy hitter parts I will need to install this into the car. I intend to install JUST these parts for the purpose of getting the 6 speed into the car, functionally running. (I have all of the remaining STi driveline parts short of the calipers and rotors which I am still undecided on, so the rest of the parts will be installed later.) The clutch and flywheel appear to be in functional condition to get me down the road. I will probably be replacing the input bearing and release bearing.

1) Will the 98 OBS starter bolt on to the 6 speed transmission and will it function correctly with the 6 speed flywheel or will I need to source a starter from a WRX?

2) Will the factory clutch slave cylinder bolt up to the 6 speed and function properly?

3) Is the factory 98 OBS pitch stop mount the same length and a direct bolt in when using the 6 speed?

4) I'm currently looking through the commonly known online wiring diagrams for the 6 speed as well as for the 98 OBS to see what I'm looking at for wiring.
What else am I missing?
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Old 07-02-2007, 01:36 PM   #2
Jaxx
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Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
Vehicle:
The 93 W/EJ20K-sold
Subaru-less :(

Default

if you are still unsure about the diff ratio take off the cover its stamped in the ring gear
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Old 07-02-2007, 02:56 PM   #3
eastcoastbumps
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Member#: 29201
Join Date: Nov 2002
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
BMW M3
Honda S2000x2

Default

You will need the STi shift linkage. Its a different length and has the reverse lock out.
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Old 07-02-2007, 06:22 PM   #4
johnny p
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Join Date: Feb 2007
Chapter/Region: NESIC
Location: wakefield,ma.
Vehicle:
02 v7sti wagon
signal green

Default

The 98 OBS is a cable clutch. You will need a hydraulic pedal box .
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Old 07-03-2007, 07:59 PM   #5
STi Hunter
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Join Date: Mar 2004
Chapter/Region: NWIC
Location: MT
Vehicle:
05 STi 6,879 miles
04 Forester XT

Default

Quote:
Originally Posted by johnny p View Post
The 98 OBS is a cable clutch. You will need a hydraulic pedal box .
Yes indeed I took delivery of the car and sure enough. Looks like I'm shopping again.


Can anyone comment on the obs starter bolting up and functioning with the sti flywheel?
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Old 07-03-2007, 10:46 PM   #6
eastcoastbumps
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Member#: 29201
Join Date: Nov 2002
Chapter/Region: NESIC
Location: Shrewsbury, MA
Vehicle:
BMW M3
Honda S2000x2

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The starter should bolt right up and work fine with the STi flywheel. I think I have an STi starter in my 5-speed RSTi.
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Old 07-03-2007, 11:22 PM   #7
Jaxx
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Member#: 177
Join Date: Aug 1999
Chapter/Region: NWIC
Location: Austin, Texas, USA
Vehicle:
The 93 W/EJ20K-sold
Subaru-less :(

Default

there was a hydro clutch swap kit in the gc8 classifieds today
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Old 07-09-2007, 02:35 PM   #8
STi Hunter
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Member#: 58131
Join Date: Mar 2004
Chapter/Region: NWIC
Location: MT
Vehicle:
05 STi 6,879 miles
04 Forester XT

Default back up top

I've purchased a pedal box and clutch master cylinder assembly so I should be back on track.

Are there any electronics surprises I should be planning for? Does anyone else have anything to offer? Any tips? Tricks for hoisting that large tranny up into the car?
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Old 07-10-2007, 01:38 AM   #9
IllNastyImpreza
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Member#: 36333
Join Date: May 2003
Chapter/Region: NESIC
Location: East Kingston NH
Vehicle:
98 RS
GT30R, closed deck madnes

Default

Quote:
Originally Posted by johnny p View Post
The 98 OBS is a cable clutch. You will need a hydraulic pedal box .
ouch thats a bummer.... so only the RS had the hydraulic clutch ?
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Old 07-10-2007, 10:59 AM   #10
mbritton
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Have a nice deal. thanks.
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Old 07-10-2007, 07:36 PM   #11
kheff46
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Member#: 66739
Join Date: Jul 2004
Chapter/Region: MWSOC
Location: Medina, Ohio
Vehicle:
2002 WRX wagon
silver

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yep RS and iirc the forester(just the 2.5l equipped/LSD models).

--keith
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Old 07-11-2007, 01:36 AM   #12
DSM_Outback
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Member#: 56345
Join Date: Mar 2004
Location: CO
Vehicle:
1997 OBS
Primer Grey

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Quote:
Originally Posted by kheff46 View Post
yep RS and iirc the forester(just the 2.5l equipped/LSD models).

--keith
My 97 OB Leggy is hydro.
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Old 07-12-2007, 09:51 AM   #13
kheff46
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Member#: 66739
Join Date: Jul 2004
Chapter/Region: MWSOC
Location: Medina, Ohio
Vehicle:
2002 WRX wagon
silver

Default

i was gonna say impreza based chassis, and that'd kinda exclude the leggy, but didn't for some reason. anything with 2.5's seems to have hydro clutch and cable for 1.8/2.2l. but im aware of the leggy being hydro.

--keith
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