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350/203 swap to 700R4/208

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by jck54x4, Oct 18, 2004.

  1. jck54x4

    jck54x4 1/2 ton status

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    I have a 79 3/4 4x4 K5 d44/14sf with a 350/th350/np203. /forums/images/graemlins/thinking.gif
    My question is can I swap out the th350/203 combo for a 700r4/208 combo with out any major problems. I am new to K5 so please bare with me i dont get on line as much as i would like to. Any and all help and advise would be great, thanks in advance.

    Carlos /forums/images/graemlins/pimp1.gif
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    I believe you can use the trans/adapter/case and just need the to use the driveshafts from a 700/208 Blazer , as well as the 208 shifter . You may need a rear joint adapter , and the crossmember /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif
     
  3. jck54x4

    jck54x4 1/2 ton status

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    I have everything that i need, I was just wondring if it will go in without any major problems.I was told by some guy that it would not work but he did not give a reason.
     
  4. jck54x4

    jck54x4 1/2 ton status

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    ttt /forums/images/graemlins/pimp1.gif
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    [ QUOTE ]
    I was told by some guy that it would not work but he did not give a reason.


    [/ QUOTE ]

    Ok it will work , and heres why :

    1. Your transmissions and the engine , all have the same mounting pattern . So the trans will bolt up to your engine no problems

    2. The frame and wheelbase should be the same length . 106.5 wheelbase on both your year and the donors year . The frames body mounts changed , but I still think the motor is mounted in the same spot , so since it all goes back from the motor your good .

    3. The trans mount crossmember can be moved on the frame if needed .

    If you bolt it all together , use the right crossmember , mount the shifter in the right spot , use the right length driveshafts , buy the adapter u-joint , it WILL fit .

    The other guy doesn't know anything .

    And besides if it wasn't an exact fit , there are many of us here that would help you through it to make it fit . /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif
     
  6. jck54x4

    jck54x4 1/2 ton status

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    Thanks for your help/forums/images/graemlins/bow.gifI didn't want to tear into it blind. I plan on starting on it next week while i am on vacation.
     
  7. dmntd

    dmntd Registered Member

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    When I purchased my 85k5 it had already been modified. They droped in a 350 and the 700R4 and 208 Xfer case.
     

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