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TC TH400 - thread size?

Discussion in 'The Garage' started by dieselponyexpress, Jun 16, 2005.

  1. dieselponyexpress

    dieselponyexpress 1/2 ton status

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    Searching for new bolts for my th400 converter (behind a 6.2l diesel), it seems to me a 10mm-1.5 would fit.
    Well, not exactly, so my questions.

    This is the same for both of my converters (old & new).

    I know the 6.2 motor does have a lot of metric threads but never heard of a GM tc with other than standard size threads, like 3/8-16.

    In a parts catalog I found bolts for a H1 (with the old th400) with metrich threads. :confused:

    I had lots of problems in the past with loose tc bolts and broken flexplates, so I want to go for sure this time.

    What do you guys use?

    Walter
     
  2. gambit420s

    gambit420s 1/2 ton status

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    ive got 7/16-20tpi in a couple converters i've got laying around; 80 caddy, 80 c-30, 89 V-2500, 72 98, but i think 700's 200's 4l60(e) and 4l80e's are M10x1.5
     
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    All your info and it doesn't even cover his application. :doah:
    Actually, i do think it is 10 x 1.5mm though. :thumb:
     
  4. gambit420s

    gambit420s 1/2 ton status

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    which is exactly why i put it there, i didnt know if the diesel t/c was different as i am not lucky enough to own one. thus the statement about the metric size being correct for other gm tranny's
     
  5. dieselponyexpress

    dieselponyexpress 1/2 ton status

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    Good Info - Thanks a lot gambit & 4x4high :)

    Not too tricky finding a M10x1.5 here in germany ;)

    Do you think I should go with a spring washer or take bolts with a larger head section (like a built in washer - don't know the term in your language, sorry for that)?

    Thanks again.

    Walter
     
  6. dieselponyexpress

    dieselponyexpress 1/2 ton status

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  7. POWERMAD

    POWERMAD 1/2 ton status

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    That would be a flange head bolt, that is what I would use with a dab of blue loc-tite.
     

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