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TH-400 swap , a couple simple questions

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mpascino, Nov 6, 2001.

  1. mpascino

    mpascino 1/2 ton status

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    Hi, swaping in a th-400 and 205 combo soon. Does the shifter linkage line up? I know it is interchangable between a 700 and th-350 but never tried the 400. Also, do I need the kickdown relay right away or is it somethign I can do after I get this thing running. Where can I find the kick down stuff?
    Thanks for the help,
    Mike

    The jeep eater ......jeep it's what's for dinner[​IMG]
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    The kick down is just a cable off the transmission that goes to the carb. When you slam on the pedal, it pulls on the cable and opens a valve in the transmission, causing a down shift. It's all mechanical, no electricty involved what-so-ever (unless you have a lock up 400, but thats another story).

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    TH400 trannies are electric kick-downs. They do not use the same linkage as the TH700R4 does. Both are very different.

    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  4. mpascino

    mpascino 1/2 ton status

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    Does this mean Racheting shifter!?;-)
    Mike

    The jeep eater ......jeep it's what's for dinner[​IMG]
     
  5. mpascino

    mpascino 1/2 ton status

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    I know for a fact that there is no cable on a th-400. It is an electric switch, but I have no Idea how that ties in with the throttle linkage.

    The jeep eater ......jeep it's what's for dinner[​IMG]
     
  6. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Oooo, I learned something new today, since they both had vacuum modulators, I just assumed that they were the same kick down, looks like I made an A$$ out of U and ME , haha.

    <a target="_blank" href=http://www.geocities.com/bigkern76>http://www.geocities.com/bigkern76</a>
     
  7. HarryH3

    HarryH3 1 ton status Author

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    My K5 started life with a Turbo 350 and NP 203 underneath. It now sports a Turbo 400 and NP 205, from a 1980 1-Ton pickup. The shifter for the 205 lined up perfectly with the existing hole in the floor. [​IMG] I did have to relocate the crossmember, since the Turbo 400 is a bit longer. But that just required drilling 4 new holes in the frame.

    The kickdown switch for the Turbo 400 attaches to the bracket that holds the accellerator pedal. My bracket even had the holes already drilled in it to mount the switch. Easiest place to find the switch is on an early Jeep Grand Wagoneer. They used to run Turbo 400's and there are a zillion of them rusting away in junkyards. [​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>
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  8. HarryH3

    HarryH3 1 ton status Author

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    Oh yeah, the shift linkage to the tranny lined right up too. [​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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