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Thread: Ford C4

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    Ford C4

    For owners of a C4 gearbox who dont have much knowledge of them I found a little screw today whilst fitting the modulator pipe. It is deep inside the modulator valve and when you turn the screw clockwise it makes the changes later and harder,turn it anti clock and it changes earlier and smoother I havent fitted a kick down cable as it is fitted with a manual valve body...

    Last edited by Fordson Van; 23-05-2012 at 20:01.

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    fat rotbox rodder hurtz's Avatar
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    if the ford c4 box with a manual valve body works the same as a chevy th350 with a manual valve body then there shouldn`t be a modulator valve.i was told the modulator valve allows the autobox to go into drive.if you blank the vacume pipe of you should only get 1st and 2nd.with a manual valve body you have to shift manuallythe box wont shift on it`s own ,hence manual valve body .i could be wrong await reply from gearbox specialist
    livin' on beer 'n' jaffa cakes -one box per pint

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    Quote Originally Posted by hurtz View Post
    if the ford c4 box with a manual valve body works the same as a chevy th350 with a manual valve body then there shouldn`t be a modulator valve.i was told the modulator valve allows the autobox to go into drive.if you blank the vacume pipe of you should only get 1st and 2nd.with a manual valve body you have to shift manuallythe box wont shift on it`s own ,hence manual valve body .i could be wrong await reply from gearbox specialist
    Ive got the best of both worlds now. I have full control with the manual valve fitted and it changes automatically up gears when in drive. But without the modulator pipe connected the gearbox wont come out of first gear when drive is selected so must still be controlling upshifts!

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    Official RnS Addict fad15's Avatar
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    On the 350 the kick down cable just does kick down. The modulator controls the pressure ( which controls the shift points) So adjust it 1/2 turn one way and drive it. Then turn it 1 turn the other way and drive it agin. Now you will feel the result of the adjustment. Go from here and keep adjusting till you get the shift you want. Personally with 400 plus HP in a T i want a smooth, standard like shift, which is different to the modern auto shift you get these days with an ECU dictating, the shift points, clutch overlaps and torque sensitive input.

    For me a smooth, non tyre chirping change is the best. After all with enough HP to burn most cars why would you want a sideways change, cept to impress the looker on?
    G
    built by hand NOT by computer

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    fat rotbox rodder hurtz's Avatar
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    is it a manual valve body or a shift kit?
    livin' on beer 'n' jaffa cakes -one box per pint

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    Exceeded sell by date Plumpcars's Avatar
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    I don't see how it is a manual valve body.

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    fat rotbox rodder hurtz's Avatar
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    Quote Originally Posted by Plumpcars View Post
    I don't see how it is a manual valve body.
    thats what i thought,i have a tci streetfighter manual valve th350 gear box.i have to drve it manually through the gears otherwise it won`t change gear
    livin' on beer 'n' jaffa cakes -one box per pint

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    Quote Originally Posted by hurtz View Post
    thats what i thought,i have a tci streetfighter manual valve th350 gear box.i have to drve it manually through the gears otherwise it won`t change gear
    Same as my Frosty built C4, if I put it in D it was in third and that's where it stayed...

    Fueled by Jim and Luckies.
    Still doing all the shit I used to ;-)

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    Official RnS Addict stu460's Avatar
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    The clue is the word manual. A manual valve body won't shift between gears by itself, that's the whole point. The box does not have a "drive" position only the individual gears which have to be physically selected.

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    fat rotbox rodder hurtz's Avatar
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    it might be a new design manual valve body, that lets you shift automatically
    Last edited by hurtz; 25-05-2012 at 20:01.
    livin' on beer 'n' jaffa cakes -one box per pint

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