Originally Posted by
Reaper1
It might just be something wrong with the cables or the cable adjustment. Make sure the grommets are still in the ends of the cables, especially down by the transmission. Only one cable will have a grommet there. The other one has a ball-end that should fit snugly. Check the shifter end of the cables as well. The problem could be there.
Has the transmission ever been serviced? If not, it still probably has ATF in it. Non-synthetic 10W-30 motor oil is a better choice that isn't as expensive as specialty fluids.
There are a few people that specialize in our cars and particularly our transmissions. I don't want to name anyone specific due to unintended perceived favoring. Some can be found in the "Vendors" section here on the forums, and others can be found on Facebook.
Welcome!