Dart Sport window play

I would check to see if the window sweepers (Belt line moldings) are worn out first, the driver's side does get most use. Next, the glass adjusters up top for the in & out of the glass could be worn also, they usually have some kind of fuzzy/anti-rattle material on them, & last but surely not least, the window regulator itself may be worn out causing slop. Door glass can be difficult to adjust correctly, so a factory service manual for your car would be a must. They are worth their weight in gold & very helpful for stuff like this. You should have no problem finding one either, just don't buy a Haynes, Chilton or something similar, they're not as good as a FACTORY service manual.