First try to lift up using your hands.
How to adjust door glass 1970 mustang.
Keep in mind that a little adjustment at each point makes a huge difference so adjust in small increments.
This bolt is in an oblong hole in the door.
This what we mean by loose glass in the doors of a 69 mustang.
Replace the glue in glass with 70 type bolt in glass.
This is because someone rebonded the glass into the brackets and scraped out the old bonding.
Did you ever think of going with the 1970 mustang bolt in setup.
You can do it several ways.
I found this pic on line that may help explain my problem.
My drivers side window has been really hard to turn up and down.
Usually the door will be low and not high in the rear.
Jack it up a little at a time it is easier to lift a little more than it is to lower it to the right heigth if you go too far.
Took out the regulater and it seems to work good.
If the door is off just a tiny bit up or down at the rear you can lift or push down on the rear edge.
Mine are all new 70 glas.
The regulator where it mounts to the window bracket on the left side in the pic has a slot that allows the window to be adjusted forward or rearward.
Is the back edge sticking out too much or in too much.
Hey guys have a 69 mustang with the 70 bolt in glass.
Are you trying to adjust the window fitment.
The old bonding is the alignment.
Just those 3 bolts and 1 nut do all the adjustments you need.
It turns slightly hard one way which i think is where the spring tension is and easy the other way.
Loosen it and adjust the height of the rear of the glass so that the window will close evenly across the top and re tihten.
My window wont slide easy i.
The best way to solve the problem is to do exactly what ford did for 1970.