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TH400 Kickdown switch??? What exactly do I need?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by dawson444, Dec 10, 2001.

  1. dawson444

    dawson444 1/2 ton status

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    I am going to be putting a TH400/203 in place on my 700R4/208 in my 88K5. I know I need a kick down switch off a Wagoneer. Where on the Wagoneer is this switch and what all do I need to grab? Where do I need to install these in my K5?

    Also I have seen some talk about a B&M kit for the kick down, can someone shed some light on this for me. Does the wagoneer switch replace the B&M thing or do I need both? Thanks!

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     
  2. POWERMAD

    POWERMAD 1/2 ton status

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    You can get and use the switch from any GM rig.
    It mounts by the throttle pedal. Your rig should have the place to mount it.
    Just run a wire that is hot from key on, to one side of the switch and run another to solinoid on the tranny.


    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  3. dawson444

    dawson444 1/2 ton status

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    top

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     
  4. 79k20

    79k20 1/2 ton status

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    The B&amp;M kit is part # 130-20297 out of a JEG'S catalog. It says the installation is a snap and mounts to either a TH-700 or TH-350 throttle cable bracket. Price is $43.99

    <font color=red>Sean<font color=red>

    [​IMG]<font color=red>79 k20(duh) d44, 14bolt, built 350,350,np203,9"lift</font color=red>[​IMG]
     
  5. dawson444

    dawson444 1/2 ton status

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    Do I need this or will the switch off the Wagoneer work in its place? Or do I need both? Thanks!

    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     
  6. TheGeneral

    TheGeneral 1/2 ton status

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    go to a yard and get one off a GM donnor truck that had a 400 in it, that is where mine came from anyway.

    If you ain't hurt, you ain't playin' hard enough.

    The General
     
  7. Smitty

    Smitty 1/2 ton status

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    Lokar also makes a sweet kickdown for the 400.

    Smitty
     
  8. HarryH3

    HarryH3 1 ton status Author

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    The switch from just about anything that came with a Turbo 400 will work. The ones that I've found easiest to locate in the junkyards are in old Wagoneers. Most of them came with a Turbo 400 with a special bolt pattern to fit the engines that Jeep used. The switch is mounted to the bracket that holds the accellerator pedal. The holes for the mounting screws should already be in the bracket on your truck. GM 3/4 and 1-ton trucks that have automatics should have it as well. Be sure to take the electrical connectors as well.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  9. MudNurI

    MudNurI 1/2 ton status

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    okay--- whats a kickdown switch??? how do you know if you need one/have one?

    --Brandy

    LOVING the new Duramax!!!
     
  10. HarryH3

    HarryH3 1 ton status Author

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    Hi Brandy. The kickdown switch is unique to the Turbo 400 automatic (at least in the GM world). When you mash the gas pedal to the floor, the switch gets activated and tells the tranny to go into passing gear mode. Turbo 350's and 700R4's don't use this method to decide when to go into passing gear mode. They have cables or rods that connect between the trans and the throttle lever on the carb or throttle body, that provides input to the tranny.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  11. dawson444

    dawson444 1/2 ton status

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    Does the wagoneer switch replace the B&amp;M thing or do I need both? Thanks!


    Dawson
    Raleigh, NC

    88 K5, 6" lift, 36" TSL Radials, 14 Bolt, Rancho 9012s
     
  12. MudNurI

    MudNurI 1/2 ton status

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    thank you harry!

    LOVING the new Duramax!!!
     
  13. HarryH3

    HarryH3 1 ton status Author

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    Ya just need the switch at the gas pedal and a vacuum line to the modulator. Then the shifting will take care of itself. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     

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