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Thread: t350 to t400

  1. #1

    Default t350 to t400

    Doing this swap in my 79 longbed 2 wheel drive. What do I need to do. I heard you have to make a driveshaft to fit. This true. If there is a write up I would love to see it. Any help would be awsome.

  2. #2


    I can't answer your question, but if you think the driveshaft will no longer be the right length, a quick measurement of the two transmissions would answer that question.

    If your asking, because you think the u-joints might be different, I don't know, but I suspect there would be the same.

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

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