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Thread: mt75 to capri fitting guide

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    Pit Crew Decade Plus User rich_mkii_rs2000's Avatar

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    mt75 to capri fitting guide

    Right, this is my guide, well my mistakes you can learn by on fitting an mt75 to a 2.8 capri. I will update as I progress over how ever long it takes me to do it.
    I bought a hybrid box already done because it seemed at lot of effort. But if you are interested in converting 2 into 1 yourself go and visit fordpower.

    First off making sure you’ve got the correct box to fit.

    See a hybrid box next to a standard 2wd dohc box. Note on the front casings that the bolt patterns are different and straight off you can see that the top 2 bolt holes are wider on the 2wd front casing (5 1/4 inch centre to centre) and the v6 front casing only 3 1/2 inch.



    Also if you buy a supposed hybrid box you have to make sure you have v6 internals as the input shaft sticks out approximately an inch from the casing as the 2wd dohc doesn’t stick out.


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    Re: mt75 to capri fitting guide

    Comparing the MT75 to the 2.8 Type 9

    So I dragged a spare type 9 out to line up next to MT75
    Firstly from the front of the casing/bellhousing to the centre of the gearstick there seems to be only ¼ inch difference between the 2 boxes so hopefully I can get away without having to shorten the cradle and selector on the MT75.



    Width wise at the top of the casings the MT75 is 2 inches wider, so not sure how much of a squeeze it will be to get in the tunnel.

    Looking at the bottom gearbox mount I think minimal work will be required to bolt the MT75 up. The sierra mount has offset mountings so junk it. I found another mount lying around and bolted it up to get an idea of position. Some mechanical genius has already done some mods on the holes in this one but in principal I will do this as well but in a bit tidier way.


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    Pit Crew Decade Plus User rich_mkii_rs2000's Avatar

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    Re: mt75 to capri fitting guide

    So far so good………ohhh propshaft.

    Well I though it would be lucky if I could get away with using a sierra prop, mainly cos they don’t have a proper slider in as the sierra irs doesn’t move unlike the live axled Capri.

    The sierra props bolt onto the back of the MT75 unlike the type 9 props which just slide in. So you need the sierra prop to use the end regardless. Incidentally a 4x4 sierra prop to gearbox end is different to a 2wd so don’t get a 4x4 one like I did.

    Comparing their overall length the mt75 and sierra prop (bottom) against the type 9 and Capri prop, the centre bearing position is different by about 3 inches and the overall length is different by about 6 inches.



    The 2wd dohc prop does have a splined section where the 2 parts can be slid apart though im sure this was not designed for constant sliding from movement of a live prop but making gearbox removal easier or something?. You could line up the centre bearings by sliding the rear part further away but i doubt there would be enough strength in the couple of inches of splines??



    My thoughts on the prop are currently to get someone to chop part of the front prop section from the sierra prop and weld it to the Capri prop which would lengthen the 2.8 prop to reach the MT75 and keep the centre bearing in the same position. Then get a slider section put in the back part of the prop. see pic, would cut through both on red line. ignore 4x4 prop on the floor.


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    Re: mt75 to capri fitting guide

    Nudge nudge, hows it going? Got the prop made up yet? My gearbox is still lurking in the corner of my mates workshop!
    ------------------------------------------------
    One day people will stop asking 'Is that bit of your car supposed to be hanging off/leaking/on fire like that?'

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    Pit Crew Decade Plus User rich_mkii_rs2000's Avatar

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    Re: mt75 to capri fitting guide

    hey mate, unfortuneatly i have made no progress either, having just put my rs2000 back on the road and then buying 2 mkii escorts in 2 weeks has rather overloaded me.

    I think in a month or 2 it will progress again. I will use JW engineering in Bexeleyheath to make my prop. They are very good and cheaper than everyone else

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