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Thread: Need help with type of ford gearboxes

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    Bodger

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    Need help with type of ford gearboxes

    hello everyone, im after a type e rocket gearbox...

    my question its whats the difference between straight gearbox, synchro gearbox and dog gearbox? ratios? i want something good for the road and some tracks events...

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    Pole Position Decade Plus User
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    Re: Need help with type of ford gearboxes

    The Type E is a single rail 4 speed gearbox as used in the Escort RS2000.
    The Rocket gearbox is the close ratio gearbox variant of the above gearbox (rare).

    Synchro box: gearbox has synchromesh rings (std or HD) to facilitate easier shifting.
    Dog box: gearbox has no synchromesh rings to enable faster shifting (race).
    Straight cut gears: gears used are straight cut (instead of helical) these are stronger but noisier.
    Close ratio: gear cluster used have ratios closer together to get lesser rpm drop (powerband) after shifting up.
    Means that 4th gear remains a 1:1 but 2nd, 3rd and 4th are higher (numerical lower) than std.
    A 1st gear ratio of 2.04:1 (instead of 3.65) needs a lower diff-ratio otherwise getting off the line will get very troublesome.

    Google it all, you will see lots of pages with explanations and also movies.
    https://www.carthrottle.com/post/wez7853/

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    Racer Decade Plus User

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    Re: Need help with type of ford gearboxes

    Unless you have a decent chunk of torque from the engine, a 'Rocket' 1st gear is too tall for 'normal' road use IMO - if mated to a low diff, it makes 4th gear too low and motorway speeds VERY noisy! A Type 9 with a raised 1st gear is probably a good compromise for a road / track day car

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    Spanner Monkey Mkdu's Avatar

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    Re: Need help with type of ford gearboxes

    I ran a rocket with a 'small' xflow, and 3.89 diff, was a little bit to high, than a 4.4 was great.
    Than moved to a big 1600 xflow, great with this 4.4 and that long first.
    So yes it really depends of your engine and the torque it can give. some are still running 3.54 with long first gear.
    I was suprised what a genuine turbo cossy with genuine T5 can do with 3.9 in a MK2.
    I changed 3 times my diff ratio, and might change again. When you swap engine and box, I think you have to adapt the axle ratio.
    And on top of that wheel size is another factor to take into the equation !

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