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HELP !! 6 speed conversion for my 2000 UK

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Old 12 September 2017, 07:21 PM   #1
wrxmargy
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Default HELP !! 6 speed conversion for my 2000 UK

Hi all
I'm looking for the easiest way to make my 1998 UK turbo a 6 speed, The cars eventually going to be running 400bh and I know the 5 speed will loose the will to live soon after 350bh if not before !
I've read that if I get a uk sti 6 speed I don't have to change the diff , is this correct ? Is so ill go for that option but ide like to know what else is needed work and parts wise

Thanks in advance
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Old 12 September 2017, 08:17 PM   #2
Steve Whitehorn
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To drop a six speed into a UK 98 -

A UK 6 speed gearbox set up has 3.9 front diff 1:1:1 drop gear and a R180 3.545 rear diff


With a UK 6 speed gearbox you can therefore keep your existing 3.54 R160 rear diff, rear drive shafts and rear hubs.


You can also use your existing flywheel, clutch, starter motor and front drive shafts.
I personally would fit a six speed clutch - Exedy are good
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Old 12 September 2017, 10:09 PM   #3
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Quote:
Originally Posted by Steve Whitehorn View Post
To drop a six speed into a UK 98 -

A UK 6 speed gearbox set up has 3.9 front diff 1:1:1 drop gear and a R180 3.545 rear diff


With a UK 6 speed gearbox you can therefore keep your existing 3.54 R160 rear diff, rear drive shafts and rear hubs.


You can also use your existing flywheel, clutch, starter motor and front drive shafts.
I personally would fit a six speed clutch - Exedy are good
That's a quality reply mate thank you very much ! Not as big of a job as I thought then ! Any particular box to look out for ?

Thanks mate
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Old 13 September 2017, 11:03 AM   #4
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Old 13 September 2017, 12:53 PM   #5
Rob Day
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What will you be using the car for?


Cheapest option would be a UK bugeye, but for track purposes I would imagine a late Forester STI box.


FWIW I stripped a 5 speed because I wasn't sympatric, this was on a bugeye wrx. Now I believe, subject to debate, the classic boxes were stronger than the newage, and also believe that they are capable for 400 if not launched, however its not the bhp that breaks them, its the torque.
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Old 13 September 2017, 02:54 PM   #6
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It'll be for odd track use and abit of fun at pod mainly aswell as road use, I'm going to keep my eyes open for a 2003 uk sti bug 6 speed do you think that's a good idea ? I had a 2003 sti and it was bomb proofe !! Wish ice never sold the bloody thing now !
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Old 13 September 2017, 03:02 PM   #7
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All depends on the ratio's you want.


I don't know/have experience enough about each type of box to make a thorough judgement.


There must be over a dozen type of 6 speed boxes.


Ones that seem more track focussed from memory are the JDM Hawk, Forester and maybe the JDM Blob, but again I would gain a second option as I cant be 100% sure.
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Old 13 September 2017, 04:47 PM   #8
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Quote:
Originally Posted by wrxmargy View Post
That's a quality reply mate thank you very much ! Not as big of a job as I thought then ! Any particular box to look out for ?

Thanks mate
Depends on what ratios you want. The older six speeds are long in the tooth now. The weak points are the Syncros in 4th 5th and 6th. Especially between 5th and 6th. They take big power and abuse but that is where they tend to let go. So I would look into the boxes history... has it had a refurb? - then all well and good - TEG sport are the best for refurbs, but not cheap. How old is it and so on. Buy on condition/history even if it a touch more.

The 5 speeds often let go between 2nd and 3rd. Not always but often. I have seen a TY754VN hold up at about 370hp / 340lbs torque. Personally I would not push one that far as it is all a bit of a lottery.

Last edited by Steve Whitehorn; 13 September 2017 at 04:48 PM.
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Old 13 September 2017, 06:22 PM   #9
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Will have a vbaaa 5 speed available soon out of a 2001 sti

Maz
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Old 13 September 2017, 07:15 PM   #10
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[QUOTE=Steve Whitehorn;11965417]Depends on what ratios you want. The older six speeds are long in the tooth now. The weak points are the Syncros in 4th 5th and 6th. Especially between 5th and 6th. They take big power and abuse but that is where they tend to let go. So I would look into the boxes history... has it had a refurb? - then all well and good - TEG sport are the best for refurbs, but not cheap. How old is it and so on. Buy on condition/history even if it a touch more

The 5 speeds often let go between 2nd and 3rd. Not always but often. I have seen a TY754VN hold up at about 370hp / 340lbs torque. Personally I would not push one that far as it is all a bit of a lottery.[/QUOTE

I'm not bothered about the ratios really mate I just want a 6 speed that can handle the power and if fairly east to fit cheers pal ]
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Old 13 September 2017, 07:16 PM   #11
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Will have a vbaaa 5 speed available soon out of a 2001 sti

Maz
Will It handle 400bh tho mate ?
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Old 14 September 2017, 07:23 AM   #12
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I'm running more than 400 bhp in my classic .

Maz
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