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what x-fer cases can i use?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 4x4blazer, Jan 7, 2003.

  1. 4x4blazer

    4x4blazer 1/2 ton status

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    I just blew up my transfer case somehow and need a new one. I have a th400 with a np208. Can I just bolt up any transfer case( i mean np205 etc), or do i need some kind of adapter, or what?
     
  2. BLUESMAN

    BLUESMAN 1/2 ton status

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    A NP241 will bolt up,other than that(the 208) you will have to get the adapter to go with the 205.The 205 case will be hard to find since they were offered very little behind the TH400 trans.The 241 case is a little stronger than the 208,and a better oiling system.You might be able to go with an 203 case,still chain driven,but almost as strong as the 205.
     
  3. 4x4blazer

    4x4blazer 1/2 ton status

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    Will the output splines and everything be the same on a 241?
    What about the u-joints and such, all the same?
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Old 465 = 10 spline corse
    new 465 is 32 spline
    TH400 is 32 spline
    TH350 is 27 spline.
    You have to find the right adaptor and the right spline count. 32 spline NP203's are VERY rare.
    Best shot at a 205 is out of a 1 ton with the TH400. Some 80's 1 tons with the 465. If it comes out of a stick truck then you will need the adaptor for the auto truck.
     
  5. wayne

    wayne 3/4 ton status

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    If you find a newer 205 from like the late 80's to 91 I think was the last year they have the same round pattern as a th400/208 combo does and will bolt right on. I think you can even use the 208 adapter. With the older 205's the adapter is different and I'm not sure what needs to be changed. You can get another 208, or you can use a 241 and change the input shaft to a 32 spline.
     
  6. u2slow

    u2slow 1/2 ton status

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    Can't use the 208 adapter with a round 205.... Its about 1" different in length, and the 205 one has a shifter boss and notch for the shift rails.
     
  7. wayne

    wayne 3/4 ton status

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    I wasn't sure on that. I have not looked at the 2 side by side. Thanks for the info. /forums/images/graemlins/thumb.gif
     
  8. 4x4blazer

    4x4blazer 1/2 ton status

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    Cool. Thanks for all the info yall.
     
  9. R72K5

    R72K5 Banned

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    th400 203's are very common under the 70's 3/4 ton 4x4's, see them all the time
     

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