I have a 99' XJ. My driver side window shakes when I operate the up/down switch(I can rock it forward and back by hand). My passenger side is perfectly smooth. Is this a simple adjustment to fix it? Had the door panel off a few times and am mechanically inclined. I just never done "windows". I searched but found no clues

 

My same window does the same thing, just from to much use?

 

I guess. There has to be am adjustment for it. I i'll pull my door panel this weekend and see if I can figure it out. Just wanted to see if anyone had this problem and tackled it themselves.