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Thread: A 523/A543 parts interchange

  1. #1
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    A 523/A543 parts interchange

    Hey all, I am wondering if there are any parts besides the A543 trans axle case itself that cannot be used in the A523 trans axle. I am going to change from 3.85 ratio to the 3.50 ration gear set.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  2. #2

    Re: A 523/A543 parts interchange

    are you working with a 3.85 large spline and a 3.50 small spline?

  3. #3
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: A 523/A543 parts interchange

    I have a 3.85 :1 in the car, I'm looking to go to 3:50 to 1.

    - - - Updated - - -

    My present trans is a 1991 large input.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  4. #4
    Supporting Member II Turbo Mopar Contributor ajakeski's Avatar
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    Re: A 523/A543 parts interchange

    523 & 543 guts are all the same.

  5. #5
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: A 523/A543 parts interchange

    I suspected that but before I pop for that trans I wanted some further info.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

  6. #6
    Super Moderator Turbo Mopar Staff 135sohc's Avatar
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    Re: A 523/A543 parts interchange

    The only 'gotcha' I can think of, if it applies to anything your using for donor parts.

    1990 transmissions use a different 3-4 shift fork that is slightly wider than the later ones because the fork pads are different and unique for that year only. The 'black' fork pads from a 520/555 will fit and work just fine though. If you were to use the H shaped ones from a 1991 and newer unit on the older fork they would install but quickly fall out during use.
    1994 Shadow Sedan. 2.2 N/A, A568 400,000 miles. "the science experiment"
    1987 Shelby CSX #418. Long term rebuild and restore ?

  7. #7
    Supporting Member II Turbo Mopar Contributor jeff1234's Avatar
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    Re: A 523/A543 parts interchange

    That is valuable info for anyone considering this swap. Thanks.
    The only substitute for cubic inches is cubic dollars, how fast can you afford to go?

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