1. Richard Kennedy

    Richard Kennedy Member

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    I was wondering how to identify a 904 and a 904 lockup transmission.
    Is there a physical difference or maybe something in the serial #.
    Thanks in advance for any help.

    Richard Kennedy
     
  2. oldkimmer

    oldkimmer FABO Gold Member FABO Gold Member

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    .................A non lock up has splines all the way to the end of the input shaft........a l u will have the last 3/4 in smooth.............kim......
     
  3. 65Valiant310

    65Valiant310 Well-Known Member

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    Got a pic we could reference?
     
  4. 604

    604 Well-Known Member

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    It is very very obvious. Smooth shinny tip to the input shaft on the lock up one. Would be nice if one could tell from the outside, but I have never figured out how.
     
  5. Richard Kennedy

    Richard Kennedy Member

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    Thanks for the help I will be picking up a 904 lockup today for free.
    Was told that it cam out of a 79 Aspen that had 36K on it. I will also be getting the engine from the same care a slant super six for $400.00 They have been sitting in a barn since 1982 I hope they are not locked up.
    Thanks again for the help.
    Richard Kennedy
     
  6. Moparhead64

    Moparhead64 Well-Known Member

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    Input spline on a non-lockup looks like a manual 4 speed input shaft .
     
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