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*HD* Stamped on a TH400

Discussion in 'The Garage' 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. 79k20350

    79k20350 3/4 ton status

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    who ever said that is wrong. it will work with the motor fine unless its a b.o.p verison. Not sure what t case you have (203 or 205) and what the transmisson is (2wd or 4wd) we need more info.
     
  3. 74BBPowerHouse

    74BBPowerHouse Registered Member

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    205 Transfercase. It now is setup with a Built 454 TH350 and 205. Its for a 4wd application. Im just trying to make sure itll work before i buy it.
     
  4. Masiony

    Masiony 1/2 ton status

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    well, if it already has a BB in front of it, that should answer your question.
     
  5. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    no it won't work with your current t-case with out swapping input on the case there also 2 different 4x4 TH400 one is for the 205 and one is for the 203:mad:
     
  6. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Actually there's 3, 208 is different also.
     
  7. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    Is this the elusive TH475 or is that a different beast all together :confused:
     
  8. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    really??? 208/241??? well I know a 241 from a TH400 will replace a 208 from a 4-spd man and here everbodys always Saying how well chevrolet stuff interchanges
     
  9. tarussell

    tarussell 1/2 ton status

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    As long as the out-put shaft fits the correct style/model transfercase a TH475 and all Chevy pattern TH400 cases will work.

    As far as I can recall the 4x4 versions of the GM version TH400 had three different out-put shaft lengths (just as NEVRENUF said ).
    400/203 = shortest out-put
    400/208-241
    400/205

    Note: There are several different out-put shafts for a TH400 that were offered in 2WD and other manufactures but the GM 4WD's came in three lengths depending on what it was in front of .

    Tom
     
  10. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    The 475 is the same as the 400 ecept for the 475 has straight cut geras and the 400 has helical . Correct????
     
  11. tarussell

    tarussell 1/2 ton status

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    Yep ! Different applications had some external differences but basically the cut of the planetary gears , shallow piston/drums and such make up a TH475 .

    Tom
     
  12. resurrected_jimmy

    resurrected_jimmy 1/2 ton status

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    that rings a bell, its been several years since I looked into the 475, I know they put them in tow trucks and school buses (diesel application???) and you had to do some sort of mods to them to run em behind a gas motor because they don't like the rpms
     
  13. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    I thought they were mostly used in breadtrucks, motorhomes,Moving vans and such with gas and diesels
     
  14. 74BBPowerHouse

    74BBPowerHouse Registered Member

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    Thanks for all the input guys. Ill try and get you some more info on what it was behind. A buddy of mine got it through his gfs family. Hes was saying how strong it is because it has the "HD" stamped on it. It has a 205 hooked to it to. I just need something to replace my blown up TH350. I only have 110 miles broken in on that motor. Nobody around has TH400 hooked to a 205. Everyone has 2wd Th400. Which I would only have to get a 205 shaft for right and a 4x4 adapter?
     
  15. 79k20350

    79k20350 3/4 ton status

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    i thought you just said it had a 205 hooked to it...:confused:

    Also you need the pedal assemby from a 400 truck. it has an electronic switch to kick down the tranny.
     
  16. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    is the "HD" really stamped into the case? Never seen that before. My HD th400 has the HD letters cast into it. Not 100% sure which planetaries it has... but I will soon. :grin:

    j
     
  17. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    You can also get this switch from summit or jegs

    I have seen the TH 475 behind gas motors in motorhomes
     

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