Ok maybe someone can answer this for me. On my 02 Grand am my back door windows go down about 3/4 of the way leaving about 4-6 inches of glass, meanwhile I see many other Grand am's of various years (99-04) with the back windows almost all the way down with about only an inch at the highest point.

My question is are they susposed to go down that far, or are the people in the other g/a's modifying the window track?

It could be some sort of a child restraint is turned on. Check your door jambs for a switch maybe check the book that came with the car for dis abling child restraints.