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Need help on t-case install**UPDATED**

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by solowookie, Jun 20, 2001.

  1. solowookie

    solowookie 1/2 ton status

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    OK, I got a NP241c off a K5 that had a 700r4 in it, and I'm trying to install it on a SM465 of the same generation.

    I haven't actually sat down and counted splines, but from a basic view it looks OK.

    I have all the numbers off the tranny and the t-case, and I'm wondering if somebody can verify that these 2 should mate up....

    t-case <font color=blue>Came out of a 90 K5 auto</font color=blue>
    model np241c
    assembly 15624673
    serial 2-20-89-3
    ratio 2:72

    tranny
    nfc (I think) 10
    465452
    9075

    Thanks for the info guys... Any other suggestions are welcome.

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  2. Blazer1970

    Blazer1970 1/2 ton status

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    Re: Need help on t-case install

    I thought the spline count was different. 32 spline for the later model 465, 27 for the 700R4? But I could be wrong.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    Yes, I was thinking the same thing as Blazer 1970.....

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
    <A target="_blank" HREF=http://www.geocities.com/emmettology101>http://www.geocities.com/emmettology101</A>
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    700R4 = 27 spline same as the TH350
    TH 400 and newer SM 465 = 32 spline

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    Thats what I'm squauckin! :)

    <font color=green>MIKE</font color=green> - "Hukd on fawnics,werkd fer me!"
    <A target="_blank" HREF=http://www.geocities.com/emmettology101>http://www.geocities.com/emmettology101</A>
     
  6. solowookie

    solowookie 1/2 ton status

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    yea, that is EXACTLY what I was afraid of! Now I got a auto tranny, but I gotta decide against converting everything over to the auto for now (got a killer deal on tranny and tcase), or finding a different tcase for my blazer.

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Keep the SM 465...they don't blow up. Sell the auto and 241 for a profit if ya got a good deal on it.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  8. solowookie

    solowookie 1/2 ton status

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    well if I put in the 700 I'd just keep it until it blows up, and then I'd probably mate up a np205 to the sm465...

    second question though, and I take that shaft off my old tcase and swap the two???

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    OK Jeff ya got me! I don't see why you couldn't swap inputs, but I have no idea how involved it is.

    Rene

    <font color=green>Dyslexics of the world...UNTIE!</font color=green>
     
  10. solowookie

    solowookie 1/2 ton status

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    my mechanic called a shop that does this kind of work for me (just barely found out), and they said that they are interchangable, so I'll tell ya how involved it is! [​IMG]

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     
  11. solowookie

    solowookie 1/2 ton status

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    found out that this is supposedly a pretty detailed project... I gave it to a company to swap shafts on for $100.00...

    also found a guy that has a tranny and tcase out of a 76 (sm465 and a np205) so when I blow this up I can swap it all over and have a 205. don't really have the time to swap it all right now. he's giving it all to me for $300.00...

    [​IMG] <font color=blue> Jeff </font color=blue> [​IMG]
     

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