Ford Fiesta ST
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#528907 - 14/02/14 06:00 PM Gearbox Conversion
B33fy Offline
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Registered: 13/02/14
Posts: 13
Hi all, looking for some advice on linking my engine to a decent gearbox for my kitcar project, which is basically a transverse mid engined caterham type car using a duratec from a mk6. I didn't get the standard gearbox because I understand they don't take too much power. (the engine will be approx 300-320bhp).

I do have a Mazda 3 mps box which I understand has the same bellhousing pattern as the ford box, though the clutch arrangement is different.

The question is what do I neeed to do with the clutch and flywheel to make the Mazda box work (I can sort the gear linkage) and will the offside driveshaft bolt on ok?

Are there any other cost effective alternatives that I could consider if the mazda box isn't a goer?

Cheers all

Edited by B33fy (14/02/14 06:00 PM)

#528921 - 14/02/14 07:44 PM Re: Gearbox Conversion [Re: B33fy]
Dan_The_Man Offline
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Registered: 20/10/08
Posts: 7389
Loc: Eaton Bray, Dunstable
the gearbox that most people use with the fiesta ST is the MTX75 from the focus, i would be interested to see how you get on with the mazda box, is it a 5 speed?
Red Escort 1.6LX
Then - Red Escort 1.4
Then - Silver Fiesta ST 170BHP
Then - White Fiesta ST MR200+
Now - Mitsubishi Evo IV Forged 2.3 500BHP
and Mondeo Mk3 2.0TDCI

#528925 - 14/02/14 08:09 PM Re: Gearbox Conversion [Re: B33fy]
The South East Massive

Registered: 21/05/06
Posts: 50824
Loc: Kent
The MPS is 6speed

#528931 - 14/02/14 08:51 PM Re: Gearbox Conversion [Re: ROB IS THE STIG]
B33fy Offline
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Registered: 13/02/14
Posts: 13
Originally Posted By: ROB IS THE STIG
The MPS is 6speed

Yep, the attraction is the standard slipper along with the ability to take 300bhp as standard according to the Mazda boys, the flywheel has a different bolt pattern though and I haven't a clue what to do with the clutch

#529005 - 16/02/14 02:16 PM Re: Gearbox Conversion [Re: B33fy]
Adam08 Offline
Site Supporter

Registered: 15/10/08
Posts: 15118
Loc: Harpenden, Hertfordshire
MTX75 I'm about to put 400 through mine been running 300bhp and 300lbft through it for ages

407BHP and 340lbft
TD GT28/32 hybrid turbo, 3inch decat, 2.75inch exhaust, air intake + large MAF, injectors, fuel pump, tubular manifold

#529035 - 16/02/14 08:48 PM Re: Gearbox Conversion [Re: B33fy]
nosnow3 Offline

Registered: 11/06/09
Posts: 1930
focus rs is apparently more stronger

#530367 - 27/02/14 08:37 AM Re: Gearbox Conversion [Re: B33fy]
B33fy Offline
Site Supporter

Registered: 13/02/14
Posts: 13
Anyone else got a view on fitting the mazda box? Its my prefered option tbh, if its doable.

#562070 - 26/07/17 11:01 AM Re: Gearbox Conversion [Re: B33fy]
dragos_st Offline

Registered: 28/04/17
Posts: 4
Loc: Bucharest, Romania
Hi guys,

Also interested about this conversion to the mazda gearbox. Any updates on this thread?
Regarding the Mtx gearbox - is it a 5 or 6 speed? Any other relevant info that I should account for when fitting?


#562510 - 23/02/18 09:31 PM Re: Gearbox Conversion [Re: B33fy]
Afghantrooper Offline


Registered: 28/07/17
Posts: 2
Loc: Bracknell
Hi, Iím new member and Iíve been searching about for Mtx75 conversion for the st 150. Iíve got a Mtx 75 form a 2.0 Mondeo mk3 52 plate, and canít find any threads on fitting it. Iíve seen the photos from SC developments, do i still use the st clutch, drive shifts etc any advice would be good thanks

#562767 - 24/09/18 07:48 PM Re: Gearbox Conversion [Re: B33fy]
pyle Offline

Registered: 04/09/16
Posts: 37
Ford Puma 1.6-7 use the same type gearbox with far better ratios, not sure how long it will hold though..

#563356 - 22/09/19 06:50 PM Re: Gearbox Conversion [Re: B33fy]
Reece turner Offline

Registered: 22/09/19
Posts: 1
Could a 1.4 tbci gearbox fit by any chance?


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