Rear Window Problems! Help Please!

[LEEREED123]

I replace my broken rear window on my 91 jimmy and it worked great for a few days, but now, it stops about 3-4 inches from the bottom. goes down and then it feels like it's binding on something.before i drag my fat ass back there to remove the access panel, anyone have any idea what it might be?

 

[Chaddy]

Its prolly your plastic rollers in the tracks. They are about 50 cents at the dealer.