First off that sucks your truck got brokin into. Sounds like a gang initation as thats what the stupid gangs to around here. Here's what I could come up with. let me know if you need more and I might can dig up some more.
- Slide the upper run channel (1) out of the window frame (2).
- Slide the vent glass (3) upward to remove from the lower window frame (2).
- Lower the glass (3) out of the upper window frame (2) and remove.