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Of TH400's and torque converters

Discussion in 'The Garage' started by dremu, Nov 26, 2006.

  1. dremu

    dremu Officious Thread Derailer Premium Member

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    Just yanked the '400 out of my CUCV. I note on top it says "HD". This make it anything special, like is there actually a TH400HD? Wouldn't happen to be a TH475, would it?

    Also, the torque converter has SIX bolts, and not three, like my TH350's and the other '400 I've pulled. Is that weird, or in line with the above?

    Finally, what FREEKIN IDIOT at GM put *some* metric hardware on this thing and some SAE? :doah: :mad:

    -- A
     
  2. Goose

    Goose 1/2 ton status

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    Yes, TH400HD for 4x4 use.
    Thicker casting IIRC.
    No, not a TH475.
    Six bolts corredt for the TH400HD.

    All of the GM idiots.
    (seriously, global economy, low cost, outsource parts, etc,etc,etc.)
     
  3. dremu

    dremu Officious Thread Derailer Premium Member

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    Well, I could but hope for the '475 :)

    And as for the metric part ... just, grrr.

    Thanks!

    -- A
     
  4. 85-m1028

    85-m1028 1/2 ton status

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    the HD does mean it's a 475!!! throw a shift kit in it and check the accumulator piston for the front band. It is ceramic and can break leaving you without 1low, I got an aluminum replacement for mine from AA beep beep mco AMCO
     
  5. k20

    k20 3/4 ton status

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    Doesnt mean its a 475. My 400 is stamped HD, just has a thicker housing and a bolt on flywheel inspection cover, instead of the sheetmetal one with a couple screws.
     
  6. JpEater

    JpEater 1/2 ton status

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    X2.
     
  7. 79k20350

    79k20350 3/4 ton status

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    Isnt the only differance between a 400 and 475 the way the gears are cut? ones helical and ones straight right?
     
  8. 85-m1028

    85-m1028 1/2 ton status

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    here's what I'm going by....
    [​IMG]
     
  9. 79k20350

    79k20350 3/4 ton status

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    And htat says nothin as to the stamping on the case... The stamp (more appropriatley, a cast) means nothing more than thick case/ bolt on cover and i belive only in 4wd's.

    If what you are saying is true every 4x4 truck made with a 400 would really be a 475... this is NOT the case...
     
  10. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    Argue with that!
     
  11. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    Damn I'm slow.
     
  12. 85-m1028

    85-m1028 1/2 ton status

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    actualy I think a case stamped with K is just the standard 4wd, all 4wd cases came a bolt on inspection cover...
     
  13. 79k20350

    79k20350 3/4 ton status

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    along with an hd:rolleyes:

    as far as ive ever seen there is no way to tell a 400 from 475 from CASE alone
     
  14. 79k20350

    79k20350 3/4 ton status

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    Besides that page shows nothin about an HD cast into the bell...unless its written in invisible ink:rolleyes:
     
  15. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    AFAIK, they made a standard case, a "K" case and a "HD" case. both the k and HD case have a bolt on inspection cover. i have seen both in 2wd and 4wd vehicles. not sure exactly what the difference is. i have a 79 motorhome with the th400 HD case.

    IIRC, the only difference between the th375 th400 and th475 is the rear output shaft and yoke size.
     

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