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tailshafts(same or different?)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by promudder1, Jan 13, 2002.

  1. promudder1

    promudder1 1/2 ton status

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    would a np205 froma fourspeed work on a th400 if you had the adapter from a th400, are they the same spline count and size, i want to put a np205 from a stick behind my th400 that came with a 208, if i buy the adapter new from gm would it go together? has anyone done this before? i love throwing crap together it is such fun!
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    A lot of the SM 465's came with 10 spline output shafts. If the SM 465 was from a newer truck with a NP208 behind it or a NP 241 it will be 32 spline just like the TH400 version 205.

    The adaptor I don't think is available new anymore...but I could be wrong.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  3. promudder1

    promudder1 1/2 ton status

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    the 205 is 1975 version havent seen it yet to check spline count. the th400 is 1985 model
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    You'll have to swap the input's on the 205 to the female 32 spline input. The case will need boring as the bearing is a little larger.
    The face of the 205 will need to re drilled for the correct adaptor I think...

    You could ask Stephen Watson for more specifics...or even do a search through the ORD forum for more info. I'm sure I recall it being covered at least once.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
    <a target="_blank" href=http://coloradok5.com/gallery/project_T2> tRusty pics...</a>
     
  5. RGF

    RGF 1/2 ton status

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    The 75 205 will have a 10spline input gear, to make that work behind a TH400 that had a 208 you will have to completely tear down the case and have it bored for the bigger 32spline input/bearing plus buy the correct adapter. You are looking at somewhere around $400. just to do that, they have 2 different 32spline inputs a long and a short one. You will need the long version so you dont have to change out the output shaft in the TH400.
    I would keep looking for the right transfer and save yourself some headaches and money in the long run,unless your planning on rebuilding the transfer anyways.
    The military pick-ups used TH400s with 208s and 205s and it appears that all the trannys were the same shaft stick-out but they could use either transfer.
    I just fiqured this out a couple weeks ago and Ive been around for awhile, learn something new everyday!

    RGF
     
  6. promudder1

    promudder1 1/2 ton status

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    thanks for all the info guys!
     

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