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"HD" Stamping on a TH400

Discussion in 'Engine | Tranny | T-case' started by 74BBPowerHouse, May 11, 2006.

  1. 74BBPowerHouse

    74BBPowerHouse Registered Member

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    What does it really mean. I heard it wont work for my 74 with a BB. Any input?
     
  2. BurbLover

    BurbLover 1/2 ton status

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    Heavy Duty. It is my understanding that the actual case is stronger than a standard TH400. I think these came in 5/4 military CUCVs, as well as the 1-ton GM trucks.
     
  3. muddybuddy

    muddybuddy 3/4 ton status

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    believe its a th-475
     
  4. b454rat

    b454rat 1/2 ton status Premium Member

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    I hvae one sitting outside that is out of an 86 C+C. I think it's a 1 ton/HD thing, as this truck had a 350.
     
  5. 79k20350

    79k20350 3/4 ton status

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    First off...wrong forum.

    Secondly i think it means the 6 bolt cover rather than the thin stamoped steel one. also there is no way to tell a 400 from a 475 unless you pull it apart.
     

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