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Torque Converter bolt size?

Discussion in 'The Garage' started by Jonny-K5, Sep 8, 2004.

  1. Jonny-K5

    Jonny-K5 1/2 ton status

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    i want a new converter for my 65 2wd GMC. it has a TH400, but according to all the catalogs they either have a small bolt pattern or big pattern. i could get it with dual patterns, but that costs more. anyone know what i need? motor is a 350.
     
  2. COCHEV

    COCHEV 1/2 ton status

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    maybe go measure your flex plate and then campare it to the 2 patterns they are selling
     
  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    just about every flexplate i have seen are a dual pattern. can't remember what the pattern is but it should work.
     
  4. diesel4me

    diesel4me 1 ton status Premium Member

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    I beleive "MOST" TH400's use the larger bolt circle pattern,there are some exceptions--I know the 500 caddy motors flexplate has only the large pattern,probably since its the only tranny GM put behind the RWD ones with the 500 motor--I realized this when I was thinking of putting the 500 I have in my C10,I would have had to put a TH400 converter in my TH350 tranny to be able to bolt up the caddy flexplate,if I was to use the original tranny in the truck. /forums/images/graemlins/crazy.gif
     
  5. Jonny-K5

    Jonny-K5 1/2 ton status

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    [ QUOTE ]
    maybe go measure your flex plate and then campare it to the 2 patterns they are selling

    [/ QUOTE ]

    i would, but my truck is about 2 inches off the ground so i gotta spend a half hour jacking it up to do anything. i'd rather figure it out without doing that. i think i'll hit up a summit tech guy, they usually know stuff like this.
     

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