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400 trans upshift@5500 .easy fix?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by chillywilly, Aug 25, 2002.

  1. chillywilly

    chillywilly Registered Member

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    doing mud bogs here need a way to keep 400 trans in first.ty in advance!!!!!!
     
  2. NITRO

    NITRO 1/2 ton status

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    ummm. dont quite get the post, but if ya wanna keep it in first, put ur shifter in low 1. welcome to ck5

    NITRO
     
  3. rodzzilla

    rodzzilla 1/2 ton status

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    I think some of the more advanced shift kits, Such as B&M's Transpack, have the modification to allow the tranny to stay in first as long as the shifter is there. My brother has my TH400 book, so I will check later to see if there are any Modifications listed there.
     
  4. rodzzilla

    rodzzilla 1/2 ton status

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    TH400's will automatically upshift from 1st even if the shifter is held there.
     
  5. RedDwarf

    RedDwarf 1/2 ton status

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    Rod is correct
     
  6. RESTORE89

    RESTORE89 1/2 ton status

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    yep
    my old corvette was like that
    put the shifter in 1st and stomp the gas and at about 5500 rpm (60mph)
    it would bark the rear tires and shift to 2nd
     
  7. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I dunno, dumb guess...unhook the vacuum modulator. Might eliminate all upshifts.
     
  8. carolina custom

    carolina custom 1/2 ton status

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    Your tranny is shifting on the govener. Dont disconect the vavume modulator. It will show the trany zero vacume, just like WOT. You will need to modify the govener. You can modify the weights and change springs. I think you want lighter. Some people use a govener from a corvet.

    If you realy want to control shifts how about a manual valvebody? /forums/images/icons/wink.gif

    Marc
     
  9. Blue85

    Blue85 Troll Premium Member

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    You can modify the governor to raise the upshift points, but it will raise them under all driving conditions and all gear selector positions.

    It's gonna take valve body modifications to make it a manual/auto valve body. Call B&M or even Summit Racing. They should have something to help you out.
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    A shift kit will give you total control.
     
  11. Blue85

    Blue85 Troll Premium Member

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    Some shift kits will give you full control. Some won't. You have to check. Some don't do anything more than firm up the shifts. Summit lists a Transgo automatic/manual kit for the 400 for about $75.
     

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