On my 55 2nd series, I had the same problem so I went ahead and changed the anti rattle fuzzies (they go across the inside and outside of the glass inside the door top. They were easy to change out without taking the door glass out. You just roll the window all the way down. Then take a flat head screw driver and pry them out. I think there are 5 round pins that pop into the top of the door frame. I also changed the glass channel runner. That is a little harder to do. You have to remove the inside window molding and vent glass and door glass. The shop manual tells you how to change them out. Here is a link to the online shop manual http://chevy.oldcarmanualproject.com/shop/1955truck2/index.htm