Glass Question

[kwg67]

Geez, this is a great site. Every time I log on, somebody is asking a question about something I need to but hadn't gotten around to yet. Keep it up gang. My question of the day is... I just dragged home another truck, 72 sierra grande, a fine looking truck in her day I'm sure. I brought it home for parts but I decided that I wanted to take out the door glass as well as the tinted windshield and rear slider. Spent better part of the day stripping the truck but couldn't get the door glass out. Must be a trick to this - have it apart inside the door. Do I have to get the track off of the bottom of the glass? I don't see how I'm going to get the glass out without removing the bottom track and this doesn't look easy to me. I figure as per usual, I'm missing somthing here. Thanks.