1999 Pontiac Grand Prix Logo
Posted on Nov 22, 2008
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1999 transmission grand prix transmission wont shift into overdrive

  • Anonymous May 11, 2010

    run tranny codes and I will help you

  • Marvin
    Marvin May 11, 2010

    Have you tested the vehicle speed sensor signal to the processor?

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  • Posted on Mar 19, 2010
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YOUR OVERDRIVE SOL IS NOT WORKING

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  • Posted on Jul 25, 2009
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This is usually caused by
(1) Shift linkage loose, bent or binding
(2) Worn or damaged internal components

Hope this helps with your problem.

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  • Posted on Jun 24, 2009
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The 4th gear clutch shaft has very fine teeth that wear over time, if vehicle has high miles, this shaft may have failed, a sprag may have failed, the 4th gear selenoid may be bad, the 4th gear clutches could be fried, the valve body may be leaking / venting clutch apply pressure, the range selector may be off causing the VCM to believe you are in 3rd. Good luck!

1 Related Answer

Anonymous

  • 61 Answers
  • Posted on Mar 24, 2009

SOURCE: 2000 grand prix w/auto transmission wont shift into overdrive

some of the trannys has straps in them that sometimes needs to be tightened and that could be the cause of it

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