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th350 trans to a 400

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Bigmeats, Dec 19, 2000.

  1. Bigmeats

    Bigmeats 1/2 ton status

    Joined:
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    Location:
    Manhattan IL
    What does it take to acomplish this swap?

    Is it worht it?

    I have heard the 400's are a better trans, Any comments?

    I have a 203 transfercase!
    thanks!!!!!1


    Bigmeats

    Carl...75 Blazer...Manhattan IL
     
  2. ken

    ken 1/2 ton status

    Joined:
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    Location:
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    I'm doing this very swap, althought he TH350 has lasted for 11 years behind a mildly built 454, with 39.5" Swampers on a 6600 pound Suburban. To convert to a TH400, you will need a TH400 version 203, this is the easiest way. Otherwise, you'll need the adapter and the input gear for the 203 (which is defferent between the 350 and 400 trans), then totally disassemble the 203 to install the input gear. Finding a TH400/203 is easier.

    ken
     

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