It's easy to take things for granted until they're gone. Like my tailgate window, which I broke attempting to repair the bottom lifter track.

Got the replacement glass with a perfect lifter track from one of the original CFSJA members. After vacuuming out most of the remaining glass shards, removing the rotted guide rubber out of the side channels, I installed the window using the original snap clips, and tested it out.

Oddly, the window started going up on its own when I shut the tailgate -- key wasn't in the switch! The tailgate switches on these trucks are pretty unreliable. Anyway the window goes up and down effortlessly, now. I won't be able to hear that sweet AMC V-8 exhaust sound quite so clearly, but I much prefer having glass in the back.