So I dont have overdrive...but here is all the things I do have to help diagnose the issue. I have the following: Full transmition fluid, the relay next to the glove box IS clicking when I press the overdrive button on the shifter, the shift light is turning off/on when I press the previously mentio...

It should be tight.The plastic shift linkage bushing are worn out. Not uncommon for a car 15+ years old. Install some new bushings and the slop in the will be history.