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TH475 4x4 tranny

Discussion in 'The Garage' started by mountainexplorer, Nov 17, 2005.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    I know TH475 transmissions came in some motorhomes and heavier rigs. But I just looked at an '82 Chevy K30 1-ton 4x4 regular cab single wheel truck. The guy claims it has a TH475 transmission and 205. Was a TH475 and option for the K30 trucks? Or he could just be quoting an exaggeration that he was told.
     
  2. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Not that I'm aware of, but it could be swapped in with a Th400 output shaft.
     
  3. mountainexplorer

    mountainexplorer 1/2 ton status

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    I thought that maybe it could have been an internal swap into a 4x4 400 case. But I guess theres no real way of telling for sure if it was really done by a previous owner, or if it's just a regular TH400 that someone decided to say was a 475.
     
  4. sled_dog

    sled_dog 1 ton status

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    suppossedly all the 475 stuff fits in the 400 case so I'd assume the outputs are able to be swapped, thus making a 4x4 one possible. Thats what I just got from a quick google search.
     
  5. sweetk30

    sweetk30 professional hooker Premium Member

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    475 is stright cut gears . 400 is slanted cut gears. easy swap.
     
  6. 1meanm1009

    1meanm1009 Registered Member

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    I had a 475 built for my blazer. was easy swap
     
  7. mountainexplorer

    mountainexplorer 1/2 ton status

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    I had been almost ready to do the same thing years ago to my Suburban... had a motorhome 454 and TH475 I was looking at and was going to have the guts swapped into my TH400, but I didn't get the motorhome stuff and I put a 465/205 in the Suburban instead.

    But knowing it wasn't a factory option at least narrows down that either it was a swap, or the guy is just claiming it's a 475 cause it sounds better and theres no way to prove or disprove it while its in the truck.
     
    Last edited: Nov 17, 2005
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Should be identifiable by the tag on the side if it was a complete swap.

    Of course, do I know what letter code was used for a motorhome or anything else with a 475? :)

    If it follows the other GM transmission ID tag patterns, the last letter of the two or three letter code on the tag would be very near the end of the alphabet, if not "Z" itself. Of course that doesn't indicate if the internals were swapped.
     
  9. mountainexplorer

    mountainexplorer 1/2 ton status

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    Oh well, it's not something I'm going to spend any time looking in to too deeply. It's just an '82 K30 thats for sale here in Spokane, but I'm not buying it.
     
  10. diesel4me

    diesel4me 1 ton status Premium Member

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    Th375??

    I was wondering if the TH375 tranny they had in some 70's cars would work in a 4x4..the TH375 had a TH400 case and guts,but had the "small" 27 spline output shaft size like a TH350 tranny--I assume the car output shaft is too long after the tail is removed,but maybe the TH350 output would fit in the TH375 case??..probably easier to just buy a TH400 4x4 tranny--but my brother has one sitting in his shed.. :rolleyes:

    I have a short tail TH400 from a 74 monte carlo that had a 454,but I doubt it would work in my truck the way it is,without changing the darn output shaft!..I wish GM had just used ONE tranny for everything,instead of making different output shafts for 4x4's VS cars and 2wd trucks.. :doah: :crazy:
     

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