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Julian H
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6 speed to 5 speed

Hi

I have  the 6 speed and am thinking I really should change to the 5 speed. I love the 6 speed for the Sunday morning blat (trackdays are now in my past) so much but as I get older also love touring in my 7 too so the 5 speed would probably be the better option.

Is my only option the ford? I have a K series? Could I have a Mazda box which I hear so many great things about. The 6 speed is electric, I don't want to miss it too much!

Cheers, Julian

7 wonders of th...
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The ford will give you the best option for ratios, and is lighter too, even more so if you opt for an alloy casing, you current prop and gear lever will go straight in to and it will fit your tunnel cover, clutch etc too.

Full helical, semi helical and straight cut options here - without doubt the best ratio options for a 7 out there, bear in mind the 6 speed was normally mated to a 3.64 final drive, this could be retained with careful selection and could benefit you for touring, a lot depends on what power your running etc

Steve here will build you a really nice ally 5 speed box

https://www.tracsport.com/

 

K7 VCT
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Think the mazda box is wider, so only fits metric chassis ??

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7 wonders of th...
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and you would need to source a suitable adaptor as the bellhousing is semi integral 

Wrightpayne
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Julian,

You will need to change the diff too as the 5 sp usually runs a 3.9 diff.

Have you looked at changing the diff ratio to say a 3.38 (rather than the 3.62) which should drop the revs a bit. I think there is an even lower ratio?!

Perhaps have a play around with a spreadsheet / gear calculator to understand revs / speeds etc with the 6 speed ratios and different diffs Vs the 5 speed

Ian

 

Julian H
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That very useful thanks. I currently have a 3,9 LSD which i will keep long term. My 7 is super quick but super revvy! So the ford gearbox is the only option but with different innards to choose? i didn't realize I could choose different ratios?

i have dva k with 205bhp, probably too much 

Melody's weight loss councillor Wink

Julian H
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Too much for me :-o

Melody's weight loss councillor Wink

Julian H
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Too much for me :-o

Melody's weight loss councillor Wink

Roger Ford
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Who's been saying great things about the Mazda box?

In racing applications, they seem a lot worse than the Ford Type 9 box. Mine needs rebuilding for the third time, and I've only had it three years and about 12 race meetings.

rgrigsby
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I've got a BGH Geartech 5 speed with a 3.92 LSD on my Duratec, it's the uprated box BGH do with a longer 1st and shorter 5th. It's been brilliant. Certainly worth a chat with them as there are a LOT of options.

Englishmaninwales
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+1 on BGH Geartech. 

Note - When you install, the Type 9 five speed needs a gasket between the bellhousing and g/b along with sealant, otherwise it'll leak oil from the selector rail hole in the front face of the g/b. The six speed doesn't require this, but otherwise it's a straight swap.

Malcolm