GM seems to be using a longer cable now for the back glass. Part # 12542292 This cable is much longer and needs to be routed differently. Route right to the bottom of the tailgate and under the bottom glass bump stop. Years ago I replaced all of the hardware in my tailgate (including the cable). My glass was still very slow. I pulled the truck out of hibernation this year and the cable had jammed. Short story… The new cable from GM is much longer, thus: softer curves in the cable. Now I have to be careful when lowering and raising the glass. It is now faster than the windows in the doors. Finally!!! Now I can die happy.