My Chevy is having trouble switching out of the first gear. It's starting to take more time just to do so. I know this is a major problem. I wanted know if this involves a transmission fluid change, or an oil change. If neither, what could the problem be? I appreciate any responses. Thanks.

 

Is the speedometer reading? If so, and I am not sure if that late of model has a vacuum modulator valve or not.

 

the speedometer is reading pretty well. Nothing off there. I don't know if I can check to see if it has a vacuum modulator valve. Will it be in plain sight if I open the hood of the car? or is it within the engine?

 

If it has one, will be on the transmission, with a vacuum hose to it. The newer cars I am not on top of as I don't own any younger than a 2003

 

The speed sensor controls when to shift, it the speedometer isn't reading, it's a speed sensor. That will cause it to not shift until high rpms.