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'88 K5 - TH400 or 700R4, that is the question.

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by paveslave, Oct 11, 2003.

  1. paveslave

    paveslave Registered Member

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    \'88 K5 - TH400 or 700R4, that is the question.

    My 700r4 has lost 3rd and 4th again (rebuilt it a year ago, same problem).Another 700r4 or swap in a th400? What are the opinions out there? What would it take to do the swap? Any differences in length, bell housings, output splines?
    I have a stock TBI 350 and an NP208 t-case.
     
  2. Klink K5

    Klink K5 1/2 ton status

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    Re: \'88 K5 - TH400 or 700R4, that is the question.

    If you go TH400 trans, you will have to change the input coupler on the 208 t-case to adapt the 400 turbo output shaft. Also you will have to get a TH 400 adaptor plate for the swap. Drive shafts should remain the same. /forums/images/graemlins/k5.gif /forums/images/graemlins/thumb.gif
     

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