Jim,
Check your regulator before installing the glass, does it roll from the top to the bottom with out dragging or binding? If not long bolts are installed in the wrong locations and are binding on the regulator. Install the outside fuzzy guides and door length fuzzy before installation, trust me on this. Doors removed from the car, inside of the door facing up is the easiest way to install door latches, outside handles, regulators and glass in this order.
If everything is working properly this is how I installed '69 door glass:
1. Remove the two top tracks bump stops,
2. Install the outside felt guides and door felts.
3. Roll the regulator assembly so the glass attachment rail is at the very bottom of its travel,
4. Back off the track bolts and letting everything hang loosely, leaving the bolts in place (do not remove)
** (if doors are installed: drop a piece of 6" long 2X4 in the bottom of the door, you'll see why in a moment)
5. With the glass tilted down in the front and up at the rear, guide the front track wheel into the opening approximately 6" (+ -) to the rear of the track mounts at the top of the door,
6. Work the wheel carefully to the front track, lowering the rear of the glass at the same time, doing this all while using the outside window fuzzy and guides as your support,
7. When the front wheel is placed, lower the rear wheel and set it in it's track,
8. Carefully lower the glass down light force on the glass to the fussy by hand until you can attach it to the rail of the regulator,
** (if the door is installed place 2x4 under the glass to support it until you can situate your self in such a manner to safely maneuver the glass to the regulator rail and place nuts from the inside of the door)
9. Once the glass is attached to the rail tighten the nuts, snug the track bolts then roll the window up assisting it past the top of the door until you can re install the front and rear stops,
10. Install your top inside window guides hooking the inner to the door...
Hope this helps,
Rick