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Nailhead trans does allways shift ?Help!

Discussion in 'The Hokey Ass Message Board' started by 1blown57, Jun 30, 2013.

  1. 1blown57
    Joined: Oct 19, 2006
    Posts: 832

    1blown57
    Member
    from Florida

    I have an 401 nailhead in a 32 ford with buick trans ...It doesnt like to shift ..until its warm and even then ....? any help/advise ???
     
  2. willys1
    Joined: Oct 31, 2012
    Posts: 1,021

    willys1
    Member
    from South Ga

    Need more info >>>Which trans do you have? Year?
     
  3. 1blown57
    Joined: Oct 19, 2006
    Posts: 832

    1blown57
    Member
    from Florida

    No really sure its a 400 sp st ? its shifts sometimes when you let off gas ...my thoughts were vacum issue ?
     
  4. willys1
    Joined: Oct 31, 2012
    Posts: 1,021

    willys1
    Member
    from South Ga

    If it has a modulator, check for full engine vacuum when idling. Also some modulators are adjustable and may have been tampered with. Any history on the trans? Could also be a governor sticking. In order to upshift> governor pressure must override throttle pressure (modulator)
     

  5. Long Roof
    Joined: Oct 22, 2008
    Posts: 17

    Long Roof
    Member

    If it is a Buick Dynaflow transmission, they don't shift when in drive. I think 1963 was the last year for the Dynaflow. Yours may be operating properly.
     
  6. 1blown57
    Joined: Oct 19, 2006
    Posts: 832

    1blown57
    Member
    from Florida

    Thanks I will take some pics and check a few things
     

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