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1998 Mercury Grand Marquis Question: Transmission stutters when changing gears usually in higher mph range.

 

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JohnHenry, Killeen, TX, February 21, 2011, 22:14
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I have a 1998m Grand Marquis gs. The transmission stutters when it changes gears every once in a while. It makes the whole car vibrate, and seems like your driving on a rumble strip usually at the 50 mph range. It gets worse when the AC is on. It doesn't do it so bad when i manually turn overdrive off. No lights are illuminated on the dash...

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  • Answer #1

    DaveJHM February 21, 2011, 23:50
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     Master

    By describing it as feeling like a rumble strip, I can definitely say that this is a classic torque converter shudder.

    Change the fluid and filter. All the fluid. Use a fluid exchange machine if necessary. Make sure to use Mercon V. Give it 100 miles or so - and hopefully the shudder will dissipate.

    If it does not, it almost certainly will need a torque converter replacement. See a qualified transmission shop or the dealer to get a good diagnosis.

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