Question about 1999 Chevrolet Silverado 1500

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89 chevy 2500 silverado

Im trying to locate the kickdown switch under my dash, my truck has the 454 w/turbo 400 trans, i looked under the dash, and all i see is where the throttle cable hooks to the pedal linkage, and where the pedal bolts to the floor. i have been told ther is a slide switch for the kick down but cant find it....HELP!!

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  • giggles4nova Jan 09, 2009

    does anyone know where i can go online to look at the wiring for this transmission, so i can get an idea as to witch relay im looking for, there are relays on the firewall, but not sure witch one,....

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  • Master
  • 379 Answers

That was old school , vehicles with the turbo 400 transmission are equipped with an ECM controlled downshift system , when vehicle is at speeds below 70 mph a forced (detent) downshift is possible by fully depressing the accelerator ,when the ECM detects a drop in manifold vacuum (high map sensor reading) the downshift control relay is energized by the ECM , the relay detects battery voltage to the detent solenoid in the transmission to open open an oriface to force the transmission to downshift ..... if yours is not working i would first check the downshift relay , under hood , picture is so bad i can't tell , looks like on the firewall more to the passenger side , next to fuel pump relay , if it needs more diag than that maybe you should get an estimate for repair from a trans shop or such , hope ya fix it , cheers .

Posted on Jan 09, 2009

  • Rick Byrd
    Rick Byrd Jan 09, 2009

    man whataya gotta do to get a fix ya vote , come over and fix it ? ok i found the schematic , the kickdown relay is supposed to be on the firewall next to the fuel pump relay , i didn't write this manual , don't kill the messanger , the color are supposed to be , purple , tan/black , orange and a red wire , the red wire is also a fusible link , the color code is another clue to find it , and if the relay isn't the problem , check that red fuseable link , and if that doesn't solve your problem , your on your own , i have a headache , lol . cheers .

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