My 2001 Pontiac grand prix has a erratic speedometer and shifts poorly, when I accelerate, it makes noise and has lazy accleration. There are no codes. I believe I have a bad vehicle speed sensor. Am I diagnosing this right? There are two sensors for this 4t65e transmission. Rock auto has only one OEM sensor for input and output sensor is ACDelco professional, NTK and Delphi, out of all the three brand of output sensor which one is a better bet?
Speedometer erratic and shift problems in 2001 pontiac grand prix.
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