Do grease them soon, I had this on my Drivers side, kept getting slower at times then would speed back up, finally last night on the way home it stopped completely with the window down, luckily no rain today or last night, pulled the door apart no amount and fudging with the tracks would fix it and Autozone was closed so tonight 45 bucks later my window will work again,argh.
If it aint a Chevy don't raise it up!