Dan
The window is attached to the regulator by a channel on the bottom of the window. The arms on the regulator have two round "wheels" of a sort on the end and these roll in the channel.
If I recall correctly once the bolts holding the regulator in place are removed you should be able to slide these "wheels" out of the channel and lift the glass up and out. I believe you should also take the inside window frames off too.
Its been a while since I removed mine but it was quite a simple job compared to the window removal with a vent glass.
I read the shop manual before doing it and it explained it all. If you don't have a shop manual you should get one.
Bill


1949 Chevy 1/2-Ton
"Sedgewick"
In the Gallery
1989 Caprice