I believe this is the same problem that i have with my car (some times)
Just take the cover off the inside of the door, and push the window up just wiggling it back and forth.
Then you will find if it is the front track or the rear track, most likly the rear track (unless its the bottem track, then you'll have to take it to a dealership.. now on my car the tracks are glues to the window, but sence you talked about a crack you probably broke the pin on the bottom of the track and the window.. so you mite have to buy new window and pin. I cant really help you unless you tell me what wrong..
1992 toronado trofeo L27.
Stock... now experiencing technicle difficulties...