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th400 and 205

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mudstud, Jan 17, 2003.

  1. Mudstud

    Mudstud 1/2 ton status

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    I have a th350 version 205 and have found a th400 with a 203. What would it take to mate the 400 and 205?
     
  2. BARRAZA

    BARRAZA 1/2 ton status

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    I am looking into the same swap. A 205 behind a 400 has a different input, it is a female type that the 400 output goes directly into. There is no coupler like your 350 type 205 uses. The 400 input gear can be put into the 350 type 205 but it requires a complete disassembly to machine the 205 case because the 400 type input uses a larger bearing. There is good info about this on the ORD site.
     
  3. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    If I remember correctly, the tailshaft on a 203 version 400 is shorter than one for a 205 version.

    You can put the 32 spline female input shaft into a 350 version 205 without machine work but you'll need to buy a bearing with the correct inner and outer diameters (I've seen it done).

    You will also need to find the correct adapter as the trannys have different bolt patterns on the back end.
     
  4. dremu

    dremu Officious Thread Derailer Premium Member

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    Use the '203 as a doubler for the '205 <big grin>

    ORD can hook ya up with that, no problem.
     
  5. 70~K5

    70~K5 1/2 ton status

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    B&M used to make a T400 to replace a T350 in a 4x4. I think it was setup to bolt up to the T350 adapter.
     

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