If you are referring to the fit in the run channel, thats because the glass used today is thicker than that 30 years ago. The best thing I've found is WD 40 or a good silicone spray. Spray channel and run window up and down to work in and wear run channel in. Also, be sure the front, back and top of the glass is seamed good. You need a rounded edge (look at the glass in a newer car/truck). You can use 80-120 wet or dry to hand sand if necessary to relieve these edges. Be careful not to sand the outside of the glass where it will show! John
Last edited by tinnerjohn; 08/06/2014 11:16 PM.
