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what's happening in my Grand Marquis?-tranny?

Discussion in 'Car Forum' started by irishbum, Jun 30, 2005.

  1. irishbum

    irishbum

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    it started shifting hard up & down? I've also heard a hissing
    sound from behind the dash around the speedo.It's an 87 5.0,not sure if 1 has to do with the other(hissing&tranny) would appreciate some ideas though. factory eng.&trans.
    car has 80,000 miles or I would write it off (Ford crap trans.)

    thnx

    OH YEAH I RUN THE CRAP(GUN THE THROTTE) OUT OF IT SHIFT FINE.
     
  2. One Ragged Hole

    One Ragged Hole Dis ain't funny

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    Just hangin around
    A long time ago someone sold a kit to hook up in the Vaccumm Modulator hose of the Transmission. When you opened the line to atmosphere it made the car shift hard. There were varying orifices of different size. Zero Vaccumm means you're at full throttle, hence the "hard" shift. A broken Vaccumm line could be the cause of your car's shifting difficulty. Good luck.
    O-R-H
     

  3. Ljunatic

    Ljunatic On The Fringe

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    AOD trans in an 87 does not have a vacuum modulator.

    They use a linkage rod or a cable from the throttle to the trans throttle lever.

    Check to see if the plastic grommet that holds the linkage/cable in place at the throttle has broken.

    It is a pretty common failure and a cheap fix.
     
  4. Gary_P

    Gary_P

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    you do realize your car is almost 20 years old right? crap trans? I think not.






    Gary