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ford sierra sapphire gearbox

Posted: Tue Mar 12, 2013 1:53 pm
by briandr
HI where do I get info on fitting ford A type gearbox to 1098 engine new to this how hard is it thanks :) :o

Re: ford sierra sapphire gearbox

Posted: Tue Mar 12, 2013 4:35 pm
by Declan_Burns
You need a kit to do it-available from several Minor suppliers.
Regards
Declan

Re: ford sierra sapphire gearbox

Posted: Tue Mar 12, 2013 5:51 pm
by bmcecosse
Welcome to the forum. What size/spec of engine do you have ? A standard 948 or 1098 engine struggle with a 5 speed box..... And it's not an inexpensive conversion.

Re: ford sierra sapphire gearbox

Posted: Wed Mar 13, 2013 5:46 pm
by briandr
hi its 1098 engine and I think its low compression head does this make it worse :cry:

Re: ford sierra sapphire gearbox

Posted: Wed Mar 13, 2013 7:21 pm
by bmcecosse
Errr - yes -much worse.... It will struggle to pull the standard 4th gear - never mind an overdrive 5th! But all is not lost - a head and carb upgrade would make it a lot more 'useful'.

Re: ford sierra sapphire gearbox

Posted: Tue Mar 19, 2013 9:05 pm
by briandr
Hi thanks for info what head and carb should i be looking for to make a job of this to have enough umph to be able to make use of this gearbox ,or would it be wiser to stick to old box. :oops:

Re: ford sierra sapphire gearbox

Posted: Tue Mar 19, 2013 10:19 pm
by bmcecosse
Your engine will have low compression PISTONS - the head was never changed - if it has an L in the number. The upgrade is to fit a 12G940 head from a 1275 engine - and a larger 1.5" carb on a good alloy inlet manifold. This brings the power up nicely and is not too expensive. But it still amanges ok on the standard 4 speed box - better with a 3.9 or 3.7 final drive ratio. Or - go the 5 speed route if you wish - and retain whatever final drive ratio is on the car. If considering the 940 route - ask for details before you do it.

Re: ford sierra sapphire gearbox

Posted: Sun Mar 24, 2013 2:12 pm
by briandr
Hi, thank you for all your input I have made a list of things to look out for and will retain the ford gearbox until I have sourced other parts and can fit all together :D .