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Doubler question - NP205 with 32 spline output the right one?

Discussion in 'OffRoad Design' started by BurbinOR, Oct 24, 2001.

  1. BurbinOR

    BurbinOR 3/4 ton status

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    Have a line on an NP205 meant for a T350 (which I have).........has 32 spline output (fixed yoke). Is this the correct one for a doubler?

    I already have the NP203 (in the truck now).

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  2. harry

    harry 1/2 ton status

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    I though the T350 had a 27 spline???

    harry
    69k5
     
  3. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    i believe you want a th 400 version ....

    WHATS WRONG WITH A 305 ?
    81 K10 GOODYEAR 35" MTRS
    TH350 NP 208
    O R D's axles
    NO BREAKAGE :)
     
  4. Blazer1970

    Blazer1970 1/2 ton status

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    I believe what you want is one with the 32 spline female INPUT (TH400 version). Most of them have 32 spline rear outputs.

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  5. BurbinOR

    BurbinOR 3/4 ton status

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    Now I'm confused (easily done [​IMG]). This NP205 is meant for a T350 (has the adapter), which I have and don't want to change. Nothing wrong with the T350, especially since mine was just built 6 months ago. So is this NP205 capable of being used for a Doubler or not? Thanks!

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  6. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    The 205 goes *behind* the doubler adapter which goes between the 203 range box and the 205. So, if you want the strongest connection possible within the 203/205 doubler, you want the TH400, 32 spline, female 205. Then, you need a 203 range box that fits the TH350 in your truck. Can you use it? I don't know much about them but, I think, with the proper adapters, you can make it work. Maybe you'll need to change the input? If no one else knows I'm sure Stephen will answer that one.

    Works like this:
    Engine -&gt; Tranny -&gt; 203 (range box) -&gt; 205 -&gt; axles

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  7. HarryH3

    HarryH3 1 ton status Author

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    Frank, think of it this way: The output of your Turbo 350 has to bolt to the input of the 203 range box. Next, the output of the 203 range box adapts to the input of the 205 (via Stephen's magical adapter), then your driveshafts connect to the 205. Does that make sense? [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  8. BurbinOR

    BurbinOR 3/4 ton status

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    BadDog and HarryH3, thanks a ton! Had no clue how it went in sequence. Ignorance was bliss.

    So does that mean you can't use a T350 for this doubler project? Sorry for needing to educate me. It is appreciated.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  9. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Sure you can, you just gotta get a 203 range box and adapter for a TH350.

    Russ

    85 K30 CUCV, 350 TBI, TH400, 205, D60/C14, 4.56 Locked
    Some day: 4" lift, 44" tires, massive cutting, shorter wb and rear overhang.
     
  10. u2slow

    u2slow 1/2 ton status

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    ORD's Doubler seems to rely heavily on the 32-spline (input) NP205. This article is a homebrew that use the existing TH350/NP205 parts to the max:
    <a target="_blank" href=http://www.bc4x4.com/tech/2000/gordtcases/gordtcases.cfm>http://www.bc4x4.com/tech/2000/gordtcases/gordtcases.cfm</a>
     
  11. Stephen

    Stephen 1/2 ton status Moderator Vendor

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    Our Gen1 was similar to gordon's t-case setup, except we built it long enough that we could use a shaft with better spline engagement. The GEN2 has to use a female input shaft in the 205, which is conveniently also a virtually unbreakable 32 spline. That's how we shortened the kit.
    Check our catalog section on our website for info on how it works and the t-case mods. There's also some good stuff on the "205 tech" link on the front page of our site. That should help you out.

    Basically you can use your 205, but it does need to be modified to use a 32 spline input.

    Making the world better, one truck at a time.
    SW-ORD
    <a target="_blank" href=http://www.offroaddesign.com>www.offroaddesign.com</a>
     

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