1990 convertilbe gt power window fix

well there are square guide bushings that go in the track bar . usually they wear out . you can get them from ebay pretty cheap . theres 2 in each door. and i think 2 on the back windows too. that will keep it from falling from one side to the other. you can also get a rebuild kit for the motors most of the time the plastic gears strip out and that would cause the window to fall also. hopfully this helps ya out man:bigthumbsup

Take both doors apart & inspect everything. Replace anything with wear on it. Do the motors too & do both sides. Don't buy anything until you've closely examined everything, that way you only buy what you need. Enjoy!