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Old 08-04-2003, 05:20 PM   #1
TheMirror
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Default Are USDM and UK 6 speeds the same?

It looks like the 6 speed transmissions here in the US and the ones in the UK share the same ratios. I imagine they are exactly the same, does anyone know differently?
-Mirror
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Old 08-05-2003, 12:41 AM   #2
mr2guru
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Ratios are the same....
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Old 08-05-2003, 07:09 AM   #3
Kha0S
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AFAIK, the 6-speed UK box has a 3.545 rear end with a 1.1:1 center ratio (ala the US WRX), but the US 6-speed has 1.0:1 center with a 3.90 rear end.

I might be totally off-base on this one -- I just remember seeing something about it foreverago. Grain of salt and all that.

/Andrew
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Old 08-06-2003, 03:25 PM   #4
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i read something in the milwaukee paper which i assume was just a article stole from someone else seen as our paper sucks, about US sti's and how the gearbox is a prodrive modified 6 speed. there was also a post from someone on this forum writing about the last month relative to a friend of his being a subaru mechanic and going to some special training class. i beleave the US 6speed was compared to a skyline tranny. only time will tell of course. unless there is a subaru engeneer on this boards that wants to explain it to us. but it would get ugly when everyoen wanted to know y in his incompotence he mated the 5mt with the wrx in the first place
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Old 08-06-2003, 06:37 PM   #5
mr2guru
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The US six speed is basically the same as the JDM UK etc... just different ratios and DCCD with/without. It has been the same since 2001 when the first Ver.7 came out.
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Old 08-07-2003, 01:42 AM   #6
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Okay, I want to be very sure, the UK 6 spd. comes with the 1.062 and .842 5th and 6th, like the JDM version.

Ya know, these simple things should be easier to find online......

-Mirror
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Old 08-07-2003, 09:31 AM   #7
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Quote:
Originally posted by TheMirror
Okay, I want to be very sure, the UK 6 spd. comes with the 1.062 and .842 5th and 6th, like the JDM version.

Ya know, these simple things should be easier to find online......

-Mirror
From what I understand the UK/EURO version has the taller 5th and 6th gear.
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Old 08-07-2003, 09:42 AM   #8
David_Wallis
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I have a UK 6 spd in my GC8 as I am in the UK..

AFAIK..

6 Speed ( J A P spec )
3.636 (1st),
2.375 (2nd),
1.761 (3rd),
1.346 (4th),
1.062 (5th),
0.842 (6th),
3.545 (R),
3.900 (final)

UK 6 speed
GEAR RATIOS: 1st 3.636
GEAR RATIOS: 2nd 2.375
GEAR RATIOS: 3rd 1.761
GEAR RATIOS: 4th 1.346
GEAR RATIOS: 5th 0.971
GEAR RATIOS: 6th 0.756
GEAR RATIOS: Reverse 3.545
FINAL REDUCTION GEAR RATIO 3.900

David
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Old 08-07-2003, 02:44 PM   #9
TheMirror
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Quote:
Originally posted by David_Wallis
I have a UK 6 spd in my GC8 as I am in the UK..

AFAIK..

6 Speed ( J A P spec )
3.636 (1st),
2.375 (2nd),
1.761 (3rd),
1.346 (4th),
1.062 (5th),
0.842 (6th),
3.545 (R),
3.900 (final)

UK 6 speed
GEAR RATIOS: 1st 3.636
GEAR RATIOS: 2nd 2.375
GEAR RATIOS: 3rd 1.761
GEAR RATIOS: 4th 1.346
GEAR RATIOS: 5th 0.971
GEAR RATIOS: 6th 0.756
GEAR RATIOS: Reverse 3.545
FINAL REDUCTION GEAR RATIO 3.900

David
Thanks David, that's the info I was looking for. Now, a few more clarifications:
1. You had to change the rear ring and pinion to a 3.9, correct?
2. Your transmission does NOT have DCCD, it has the Suretrack differential instead, correct?
3. If you have the actual Subaru part number for your particular transmission, that would be great also.

Thanks,
-Mirror
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Old 08-08-2003, 09:11 AM   #10
David_Wallis
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the uk runs a 1.1:1 transfer so its a 3.45 or 3.545 (cant remember what it is) so the STD uk rear diff is fine... fairly sure the euro one is the same..

I have the suretrack LSD DCCD would be nice..

Part no..

Hang on..

see pic of gearbox in here..
http://www.scoobynet.co.uk/bbs/threa...hreadid=181119


David
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Old 08-08-2003, 01:11 PM   #11
stratos
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Not to get off topic here but, Nice car David! How hard was it to fit the 6 speed in your GC8? I have one in that I put in my GDA and there is not much room to spare. I can only imagine what it was like with a GC8!
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Old 08-08-2003, 03:52 PM   #12
David_Wallis
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it fitted easy std cradle and std mounting etc..

needed the following parts.

STi7 speed Sensor
Sti7 Linkage
Modified Propshaft (or Impreza Auto one)


box lifted straight in.. Heavy thing though..

Sti7 Linkage didnt come with my box so I got one from someone who had fitted a quickshift kit..

Prop... couldnt find an auto one so I had mine shortened and balanced for circa $80 - $90

David
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Old 08-08-2003, 11:17 PM   #13
mr2guru
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Quote:
Originally posted by TheMirror


1. You had to change the rear ring and pinion to a 3.9, correct?
2. Your transmission does NOT have DCCD, it has the Suretrack differential instead, correct?

Thanks,
-Mirror
All DCCD equipped 6spds have a front suretrac diff and the rear diff is clutch pack.

6spd without DCCD have 12kg viscous center and rear suretrac

Front diffs on 6spds, without DCCD, could be open or suretrac (90% were suretrac)

Just to clarify
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Old 08-12-2003, 03:44 PM   #14
TheMirror
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Default

Quote:
Originally posted by mr2guru


All DCCD equipped 6spds have a front suretrac diff and the rear diff is clutch pack.

6spd without DCCD have 12kg viscous center and rear suretrac

Front diffs on 6spds, without DCCD, could be open or suretrac (90% were suretrac)

Just to clarify
Ah yes, true. I was sort of melding the two together. As I was driving around yesterday, I started to figure that I had it wrong. This confirms it. Thanks, and thanks David for your info too!
Now the problem is, where do I get one? All US 6 speeds come with DCCD, and the parts sources I've contacted can only get same. What I need is a UK version..........any ideas on where to get a UK spec one?
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Old 08-12-2003, 09:08 PM   #15
mr2guru
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Quote:
Originally posted by TheMirror


Now the problem is, where do I get one? All US 6 speeds come with DCCD, and the parts sources I've contacted can only get same. What I need is a UK version..........any ideas on where to get a UK spec one?
This maybe the issue with availability....I THINK, but am not certain, that all the new body style STi's are DCCD equipped regardless of market. I think..... That would leave the only ones without DCCD and with Suretrac would be '01 JDM, '02 UK/JDM, '03 UK?
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Old 08-13-2003, 05:05 AM   #16
David_Wallis
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Why dont you want the DCCD??

What disadvantage do you think it offers..

Ill do you a swap for my diff

David
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Old 08-13-2003, 11:43 AM   #17
TheMirror
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Quote:
Originally posted by David_Wallis
Why dont you want the DCCD??

What disadvantage do you think it offers..

Ill do you a swap for my diff

David
Its only cost. Not that the transmission would cost any more, its just all the other stuff I'd have to do to make the DCCD functional. I wouldn't be the one performing the work, I don't have the facilities. I want to keep the $$$ investment on this standard WRX as low as possible. Thus, the non DCCD gearbox.

For info on your end, new USDM DCCD six speeds run $5500 (a shade over 3400 quid) here from the dealers with a several month delay.

Questions again: How much disassembly is needed to swap the center diffs between the DCCD and non DCCD transmissions? Cripes, I'm going to feel like I engineered the things when this is all done with.
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Old 08-13-2003, 11:45 AM   #18
David_Wallis
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not much I dont think.. I can find out..

David
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Old 08-13-2003, 11:45 AM   #19
TheMirror
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Quote:
Originally posted by mr2guru


This maybe the issue with availability....I THINK, but am not certain, that all the new body style STi's are DCCD equipped regardless of market. I think..... That would leave the only ones without DCCD and with Suretrac would be '01 JDM, '02 UK/JDM, '03 UK?
I'll check into that. The British subie website still lists the UK300 STi as having Suretrack/noDCCD but as we all know, manufacturer websites tend to lag a little........

Actually I just checked it again and lo, its listing spec for the 2003 model year. More research then........
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Old 08-13-2003, 11:47 AM   #20
David_Wallis
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NO UK 01+ car has the dccd AFAIK..

Type c or whatever it is on 03 does?

David
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Old 08-13-2003, 12:02 PM   #21
TheMirror
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From what I can gather, no UK 6 speed through the 2003 model year has DCCD. The Subaru UK website does not have it listed as an option for 2003 either. 2004? I don't know, maybe Sube will get around to updating their website at some point.
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Old 08-13-2003, 12:07 PM   #22
TheMirror
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.

Last edited by TheMirror; 08-13-2003 at 12:13 PM.
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