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  1. #1
    Do you ever leave? WB5LTR's Avatar
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    Default TH400 kickdown switch

    Im curious about these kicj down switchs, how do i know if ive got one and where abouts is it. When i floor it my revs got to about 4200 rpm and then it changes. Ive been told that the kick down switch will make it rev longer. Any ideas.

  2. #2
    Sure why not? 76lxhatch's Avatar
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    I posted a reply in the other thread - I'm not sure if the kick down switch will make it rev longer, but it is important to have it signalling the trans when at WOT and will definitely affect down changes. It's attached the accelerator pedal

  3. #3
    Do you ever leave? WB5LTR's Avatar
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    so its a switch that is on the pedel that does to the box. The modualtor has been checked and the trans dude said it was ok so i dont know.

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    Im pretty sure the 12v pulse from the kickdown switch tells the trans to increase line pressures to firm up the downchange. Which lug on the box is the kickdown wire connected to? The top or bottom lug?

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    Do you ever leave? WB5LTR's Avatar
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    LUG?? where am i looking. is there a detent switch somewhere

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    On the side of the trans on the drivers side there is a round connector with two male ends. The top terminal is horizontal, bottom is vertical. The kickdown switch itself is mounted next to the acc. pedal under the dash, when you plant the foot a pin slides towards the firewall and switches 12v to the auto.
    Last edited by greenhj; 03-08-2007 at 03:40 PM.

  7. #7
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    yer i know theres one there but im pretty sure theres nothing conected to it. Any idea of how im ment to rig it up, like what wiring goes where. Is it just a simple power earth switch circuit.

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    I think all you need is 12v at the switch, then to the lug on the box. From memory its the bottom vertical lug. The other one is something to do with pollution control (Mine came from a HZ) This operates some sort of line pressure solenoid inside the auto. The kickdown switch itself should bolt straight in if you dont have one already, otherwise maybe put a microswitch at the throttlebody or carby that close at wide open throttle. I'll check the trans. book for the exact pin to connect to. I must admit I dont even have mine connected at the moment, gotta get around to it one day. Without the kickdown switch you can potentially burn clutches in the box because of the lack of line pressure and top gear/low speed operation at full throttle which is what a lot of full manual guys do first time round.

  9. #9
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    ok thanks green so what actually does it do, at WOT does it hold and firm up shifts, and also say your in second and you plant it will it jump back to first

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    Sure why not? 76lxhatch's Avatar
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    WB it definitely does the second thing, not so sure about the first. Since you have an adjustable modulator I'd suggest tweaking it and see what results you get to make it shift later. It can't supply any less than zero vacuum or any more than the engine is supplying, so change it in small increments and I doubt you can go wrong.

  11. #11
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    ok how do i adjust the modualtor, and im happy that it does the second thing cos if i plant it sometimes im like **** come on give me 1st

  12. #12
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    Straight from the workshop manual..."The detent switch (Kickdown switch) works in conjunction with the vacuum modulator to control line pressures and downshift operation, it differs from t-350 in that it is an electrical connection rather than using a TV cable." Im not sure if it will kickdown to first at any reasonable speed without a shift kit installed, when I find it in the book I'll post the speed values for shift points.

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    thanks green.

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    I may be wrong, but I think that switch under the accelerator pedal helps it go back a gear when you want it ( full throttle ) but in taking off fast, I dont think it holds it out in gears any longer, it is only kick back I think.

    but WB you should just use the gears manually, forward gears and going back as well, its like driving a manual only with quicker shifts

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    yer stroker i thin thats the switch that is connected to the kick down switch on th trans.

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