I agree with Longhornmail, taking it now will make it easier. Take out the 3 screws along the front frame and the 2 screws near the bottom of the door. Door panel should be off. Put the window down. pull the vent window up and rotate it 90 to get the bracket out thats on the bottom of the window channel.
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72 Chevy Blazer
69 GMC Longhorn
37 Chevy Coupe
pics at
http://home.fuse.net/pierce
Cincinnati, OH