Question about 1999 Pontiac Grand Prix

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1999 transmission grand prix transmission wont shift into overdrive

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  • David Johnson
    David Johnson May 11, 2010

    run tranny codes and I will help you

  • yadayada
    yadayada May 11, 2010

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

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YOUR OVERDRIVE SOL IS NOT WORKING

Posted on Mar 19, 2010

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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.

Posted on Jul 25, 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!

Posted on Jun 24, 2009

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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

Posted on Mar 24, 2009

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