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400 turbo to 205 transfer case

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by PurePower, May 20, 2002.

  1. PurePower

    PurePower Registered Member

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    Does anyone make an aftermarket adapter to go from a turbo 400 to a 205 transfer case? I have the 400 and a 205 case off the back of a 4-speed. I cannot locate an adapter. Thanks
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Can you be a little more specific about the 400 and 205? What year is the 205 and if it has the round 6 bolt pattern adaptor or the figure 8 bolt pattern.

    Both of these adaptors are still available thru GM. I have part numbers for both and can get you a price, but first I need to know what year the 205 is. /forums/images/icons/wink.gif
     
  3. PurePower

    PurePower Registered Member

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    The transfer case has a 6 bolt pattern, I have no idea what year it is. As far as the 400 turbo I do not have it here yet but aren't they all the same bolt pattern? I also have a 4-speed to 205 transfer case (with 6 bolt pattern) adapter that is cracked at the top, do they still sell those? Do they also still sell the spline to spline adapter to connect the transfer case and transmission? Thank you. Is there anywhere on the internet I can look up GM parts like this?
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I have both of those 6 bolt round style adaptors if you need one. /forums/images/icons/wink.gif

    I can also get the numbers off the adaptors and you can get a brand new one from <a target="_blank" href=http://gmpartsdirect.com>gmpartsdirect.com</a> if you want. Their prices are very fair and will beat the dealership everytime.

    I'm at work now, so wait til later today and I can get the part numbers for the adaptors. /forums/images/icons/wink.gif
     
  5. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    If the t-case is from a 465 then you will need to change the input to the 32 spline version to mate it to a 400. This requires tearing it down and machining the bearing hole to the larger size then reassembly with the new 32 spline input. Hope this helps.
     
  6. 70~K5

    70~K5 1/2 ton status

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    Didn't the late 465/205 with the round bolt pattern come with the fine spline input?
     
  7. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    The late 465 did come with a long output 32 spline shaft. But I think it came in front of a 208. Could be wrong.
     
  8. PurePower

    PurePower Registered Member

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    How do you find the parts on gmdirect.com? I did a search and could not find anything. Why do they not let you search for 1973 to 1993? Do you have to have a part #? If so is there anywhere on the internet to find part numbers? Thanks for all of the responses.
     
  9. thatK30guy

    thatK30guy 1 ton status Premium Member

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    To get prices from gmpartsdirect.com, you gotta have the part number before you go on there to get a price. They do not give you the number. /forums/images/icons/frown.gif

    I get my numbers from the GM dealership. Then I go home and use gmpartsdirect to get an even cheaper price. /forums/images/icons/wink.gif
     
  10. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Yep, in '85, the 465/205 in K30's began the 32 spline long shaft.

    The best thing about using an '85 to '91 np205 case is that you can use the same t-case on either the 465 or 400 and all you have to do is get the correct adaptor. /forums/images/icons/cool.gif
     
  11. thatK30guy

    thatK30guy 1 ton status Premium Member

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    From <a target="_blank" href=http://gmpartsdirect.com>gmpartsdirect.com</a>, the part numbers for the '85 to '91 np205 t-case:

    SM465 = #15597792......$185.00.
    TH400 = #15597799......$156.00.

    These are both the short height adaptors which sit on the double hump crossmember from '85 to '91.
     
  12. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Oh yeah, #14022218 is the adaptor for the '84 and older 400/205 set up. /forums/images/icons/wink.gif

    From gmpartsdirect.com, that part number will run you $215.00.
    This is the tall style adaptor that sits on the flat crossmembers. /forums/images/icons/wink.gif
     
  13. PurePower

    PurePower Registered Member

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    Thanks for the numbers. I am sure it is older than a 84 but am not sure what year it is. Does the 205 transfer case that comes behind a turbo 350 the same spline as a 205 case that came behind a turbo 400? I know my 205 case that was behind my 4-speed is a coarse spline but I also have a 205 transfer case behind a turbo 350 and am not sure what spline it is, it is still in a truck.
     
  14. HarryH3

    HarryH3 1 ton status Author

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    Turbo 350's have a 27-spline output shaft. /forums/images/icons/frown.gif The Turbo 400's have a 32-spline output shaft.
     
  15. thatK30guy

    thatK30guy 1 ton status Premium Member

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    The spline counts go like this:

    400...32 spline.
    350...27 spline.
    465...10 spline.

    If you want to use the 350-version 205 behind a 400, you need to get a conversion kit for the 400 to be able to use the 205 you have.

    TCI, Art Carr, B&amp;M are a few major tranny companies that have the conversion kit you need to be able to use the 205 you have.
    The only thing is if you use the conversion kit, you need to reuse the stock 350/205 adaptor.
     
  16. PurePower

    PurePower Registered Member

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    Are all of the 205 cases that are bolted behind the turbo 400 a 6 bolt pattern? If not what years were what?
     
  17. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Just the '85 to '91, which are a round 6 bolt pattern.

    The '84 and older ones have an 8 bolt pattern figure eight.
     

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