on my 1983 k10 (with manual windows) the drivers side window is a lot stiffer then it should be when it goes up or down. every now and all of a sudden it will be very smooth when I roll the window up. the passenger side does it also but it's not nearly as bad. I haven't been to worried about it but I have my door off right now and the entire bottom section cut off for rust removal and new patch panels going in, but before the panels go in I was wondering if theirs an easy fix while I have really good access with the door cut open. Thanks