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700R4 to 400 swap!!!!!

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by k5_beater, Dec 16, 2002.

  1. k5_beater

    k5_beater Registered Member

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    Location:
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    Basicly what all do i need to swap in a 400 in place of my 700R4. I have a 350 and a NP208. I need to know if i need adapters extra hardware anything else. Thanks in advance. /forums/images/graemlins/1zhelp.gif
     
  2. u2slow

    u2slow 1/2 ton status

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    You need the TH400/np208 adapter and a 32-spline input gear for your NP208. Often its easier to get the whole TH400/np208 combo together, and just sell off the th350/np208.
     
  3. wayne

    wayne 3/4 ton status

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    Best bet is to just find a 400/208 combo. If you want to make a trip over here to Pa I can get you what you need. Send me a PM and let me know.
     
  4. k5_beater

    k5_beater Registered Member

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    what if i could get my hands on a NP205 would the switch be easier?
     
  5. imiceman44

    imiceman44 1 ton status

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    It still has to be for a TH400 which is the one used for the doubler so it's getting rarer.
     

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