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Spline count

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Suffergauge, Aug 7, 2002.

  1. Suffergauge

    Suffergauge 1/2 ton status

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    On the rear yoke of the NP203, what spline count was for what engine? I believe there are 10, 27, & 32 spline output shafts right? Which is for which motor? I need to replace the yoke on a 79 K5 and don't belive it is the stock set-up.

    Thanks
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    10, 27 & 32 spline counts are on the tranny output shafts and the t-case input shafts.

    10 spline = 465 tranny
    27 spline = 350 & 700R4 tranny (and 4L60E)
    32 spline = 400 tranny (and 4L80E) (and also '81 & newer 465 tranny)
     
  3. Suffergauge

    Suffergauge 1/2 ton status

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    What about the output shaft of the tcase? Is there a difference? It is a 350/th350/np203 combo. I need to replace the rear yoke... that's what all the questions are about.
    Thanks
     
  4. Blazer79

    Blazer79 1/2 ton status

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    Did you ever get an answer to this?

    I know this is an old post, but it's proof I tried searching before asking.

    Can anybody tell my how many splines are there in the rear output yoke of my 1979 NP203, which is behind a TH350?

    Thanks
     
  5. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    On GMs, I think all 203/205 cases used a 32 spline rear output. Front output is typically a 10 spline, but 30 exists. The Ford and Doges were available with 32 spline front outputs that will swap in. I don't know about the others...
     
  6. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    Did you ever get an answer to this?

    I know this is an old post, but it's proof I tried searching before asking.

    Can anybody tell my how many splines are there in the rear output yoke of my 1979 NP203, which is behind a TH350?

    Thanks

    [/ QUOTE ]

    I will be working on mine this week end so if you don't get answers by then I will have:
    203, 205 and 208 numbers for both rear and front output spline counts.
    /forums/images/graemlins/thumb.gif
     
  7. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Rear outputs of the 203 and 205 are 32 spline and the yokes are interchangeable. Front outputs are 10 or 30 spline for the 205 and I believe the same for the 203 but not positive.
     
  8. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    Rear outputs of the 203 and 205 are 32 spline and the yokes are interchangeable. Front outputs are 10 or 30 spline for the 205 and I believe the same for the 203 but not positive.

    [/ QUOTE ]

    I know the 203 and 205 front 30spline are interchangeable, and I don't recall seeing any 10spline 203.
    Now I will be checking the 208 and we will have all the numbers.
    /forums/images/graemlins/thumb.gif
     
  9. R72K5

    R72K5 Banned

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    10 spline front 203 exist for the 465 203 70's 3/4 tons and 1 tons with 465

    apparently 81-up 208 with 465 are 32 spline input ?
     
  10. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    10 spline front 203 exist for the 465 203 70's 3/4 tons and 1 tons with 465

    apparently 81-up 208 with 465 are 32 spline input ?


    [/ QUOTE ]

    Are you talking input shaft or front output?
    I actually had a 203 behind the 465 but never checked it, now I sold it.
    I probably should ask him to check it out.
     

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