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Thread: J20 engine swap fro 360 to 401

  1. #1
    Bulltear forum member New to the forum
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    J20 engine swap fro 360 to 401

    I have a 360.th400 Q/T...I plan on building a replacement 401 ,...keeping the TH400/QT

    What do I need to do about the flex plate?

    Thanks!

  2. #2
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
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    AMC V-8s are externally balanced. The harmonic balancer and flywheel are made specifically for each displacement, so unless you have the 360 flex plate re-balanced, you'll get a vibration. On TH400 models, there's a very thin shim/spacer in the back of the crank to center the GM torque converter, you'll need that too. I think I have a couple of 401/TH400 flex plates in my shed. I won't be home to check for a couple of weeks. I'd let you have one for the cost of shipping if I do. If you have one for a TF727 for the 401, I'd trade you even-up.

    Bob
    tufcj
    1969 AMX
    1967 Rambler Rogue

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  3. #3
    Bulltear forum member New to the forum
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    Thanks!,...I will definately do the shipping....
    I do not have a 727/401 flexplate however.....
    email.......hpschrot@hotmail

  4. #4
    Thank you from BT ULTIMUS MAXIMUS STATUS tufcj's Avatar
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    Email sent, sorry about the delay.

    Bob
    tufcj
    1969 AMX
    1967 Rambler Rogue

    If you need a tool and don't buy it...
    you'll eventually pay for it...
    and not have it.
    Henry Ford


    Vote for BULLTEAR on top4x4sites.com ===> VOTE BUTTON

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