Currently doing one piece door glass work on my doors. Here is a link that's on here that has helped me out tremendously. Watch their videos, very helpful.
http://67-72chevytrucks.com/vboard/s...=366078&page=3
http://67-72chevytrucks.com/vboard/s...=366078&page=4
Personal preference, removing the vent window gives the truck a cleaner look.
I did not know at the time when I sold my old wing/vent windows Well surprise surprise I did not know I would need some of the old parts to make my new one piece windows work properly when I install them.
I have heard complaints from different folks recently about the manual and power window one piece door glass kits from sticking , coming of the track, jamming or they don't roll the window all the way down.
I talk to acquaintance of mine that is a lead tech at an auto-glass shop that services exotics and classic cars and he said he would supply me with the glass but he refuse to install 1 piece glass on 55-59 Chevy /GMC trucks because they are a headache and it's trial and error to eliminate the sticking or hesitation problem when rolling the windows up weather it's manual or power.