If you've got a kei truck or van, it's at least 25 years old, and old cars need some love. The window felts tend to dry out and in my case, fall out, so a quick rubber window track replacement may be in order. It stopped the hair raising screech and they roll up and down much smoother now.
This was done on a 1993 Daihatsu Hijet Deck Van S83W, other trucks will vary, measure your window track first.
Window glass run channel:
a.co/d/dLhHHZh