markb
+1y
Yes, you need to take the rear window out. Very simple - just start in a corner, pull the rubber seal down, and push. Work it slowly, and it will come out.
Honestly, removal of the headliner is very self explanatory once you get the trim pieces removed...
Putting the window back in is just as easy. Wrap a piece of rope around it, in the seal channel. Set the window in place, with the bottom and one side of the seal in place. Slowly pull the rope out of the channel (from the inside of the truck), until the entire rope is out of the channel and the seal is completely seated.