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Technical C-4 transmission kickdown shaft play

Discussion in 'Traditional Hot Rods' started by studebakerhawk, Aug 3, 2025 at 2:01 PM.

  1. studebakerhawk
    Joined: Apr 29, 2010
    Posts: 58

    studebakerhawk
    Member
    from Colorado

    I'm building a 37 Ford coupe with a 331 stroker and C-4. I had the transmission build by a local shop and installed it -- only to find out later that with a floor shifter the selector lever must point up and with column shift it must point down. I got it all installed in the car and then discovered my selector was down and I need up. Got the shaft loose, rotated it and now I'm putting it all back together. With the nut on the kickdown shaft tight I have considerably more play in and out on the kickdown shaft than I think I should have. I would rather fix this now with the pan and valve body (and wishbone) already down than to have to chase a leak once the car is completed. how much play is too much ?
     
  2. jaracer
    Joined: Oct 4, 2008
    Posts: 2,926

    jaracer
    ALLIANCE MEMBER

    I didn't think you could just rotate the selector lever. In my mind that will put the part that moves the manual valve in the wrong position.
     
  3. studebakerhawk
    Joined: Apr 29, 2010
    Posts: 58

    studebakerhawk
    Member
    from Colorado

    The selector fits into the part that works the innards of the transmission in two positions -- up and down with a 7/8 wrench sized nut -- and the kickdown shaft fits inside the selector shaft -- with a nut and washer that hold in the o ring and keep the kickdown shaft inside the hollow selector shaft. my issue / question is how much in and out play the kickdown shaft should have. I seem to be able to move the kickdown shaft in and out almost a 16th of an inch
     
  4. saltflats
    Joined: Aug 14, 2007
    Posts: 13,240

    saltflats
    Member
    from Missouri

    There needs to be a little of in and out movement.
    I think there is 2 different length shift shaft and kickdown shafts. If someone install the shorter shift shaft and the longer kickdown shaft it will not work.
     

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