TH400 without electric kickdown

Discussion in 'Transmission & Driveline Topics' started by PBZ28, Nov 4, 2017.

  1. PBZ28

    PBZ28 New Member

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    Nov 3, 2017
    I just got back into muscle car ownership. Haven't had one since the late sixties. I just bought a 79 Z28 with a 383 stroker, th400, quicksilver b&m, and 10 bolt 3.73 posi rearend. Car runs and drives great but the builder did not connect the electric kick down. Will it hurt to drive it this way? I always had 4 speeds back in the day. Thanks! This the best Camaro forum on the net!
     
  2. GoldenOne7710

    GoldenOne7710 Veteran Member Lifetime Gold Member

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    Athens, GA
    It won't hurt it...just not as convenient to drive. You can obtain all the necessary parts to connect it and use as designed. Not a hard job.
     
  3. PBZ28

    PBZ28 New Member

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    Nov 3, 2017
    Thanks that is good news! Which is better, using a switch off of the accelerator pedal in the car like it probably was when stock, or something like a nitrous switch hooked up to the throttle linkage at the carb? I think all I need is a ground and switched 12 volts to go to the trans? Thanks!
     
  4. budro6968

    budro6968 Veteran Member

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    Jax Florida
    Can always manually down shift if you need to.
     
  5. GoldenOne7710

    GoldenOne7710 Veteran Member Lifetime Gold Member

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    Athens, GA
    I've seen it done both ways to be honest. Whatever is easier for you is the way I'd do it.
     
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  6. PBZ28

    PBZ28 New Member

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    Nov 3, 2017
    I seem to remember that wasn't a good idea with a TH400 unless you stay on the throttle or are stopped. Or maybe I'm out in left field here!
     
  7. PBZ28

    PBZ28 New Member

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    Nov 3, 2017
    Can't find the stock parts for the pedal so it looks like a kit from B&M for the carb is my only option or fab something up.
     
  8. budro6968

    budro6968 Veteran Member

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    Jax Florida
    Won't hurt anything. I did it all the time when I was young. Down shift and punch it. I would pretend I had a manual trans in Dear old Dad's 72 Cutlass. The TH 350 would stay in low for ever. The TH 400 would Shift out of low by it self at a high rpm. It would really slam second. Made the tires bark a little in my 75 454 Suburban. I talking about stock, no shift kit.
     
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  9. GoldenOne7710

    GoldenOne7710 Veteran Member Lifetime Gold Member

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    Athens, GA
    Unless you comb the boneyards for cars that were factory equipped with a TH400 and get all the under dash bracketry...and possibly the switch too...from the donor car. I don't like the extra clutter around my carb...But that's just me.
     
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  10. Ihada70Z28B4

    Ihada70Z28B4 Veteran Member

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    Oct 4, 2002
    Buffalo,NY,USA
    The bracket for the pedal switch is already there. The same one used for the Air induction hoods. Just get that switch and wire it up.
     
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