this may help
please ACCEPT my answer so I can get credit for my work.i don't receive commission unless you do ..i'm not always going to be giving you good news,so please dont let this stand in the way of you accepting my answer.it does not cost you more money.we will still be able to communicate.. Bonuses and positive feedback are appreciated!if you are not satisfied with my answer,please do not leave bad feed back,i will gladly opt out and let another expert handle the question.PLEASE ASK IF YOU NEED MORE HELP
GM Full-Size Trucks 1980-1987 Repair Guide
See Figures 1 and 2
Non-Stationary Door Glass
FIG : Fig. 1: Door window and regulator
FIG : Fig. 2: Removing the door glass
Manual Door Window Regulator
See Figure 3
A notch is provided in the sash panel to allow disengagement of the forward roller on the window regulator.
FIG : Fig. 3: Manual window regulator
Power Window Regulator and Motor
See Figure 4
FIG : Fig. 4: Power window regulator and motor
CAUTION Step 9 must be performed when the regulator is removed from the door. The regulator lift arms are under tension from the counterbalance spring and can cause serious injury if the motor is removed without locking the sector gear in position.