Im about 80% complete on my re-build (85 K5) and it was time for a new windshield to go in. By the way the old windshield has been out for almost 2 years now. Anyway, so I have the original gasket from when I bought the truck used 9 years ago, and have not done any work to the windshield area or in the cab other than removing rust and paintng that lip that the gasket goes around. Now my problem is, the safelite auto glass guy came and attempted to put the windshield but came to the realization that it wouldn't fit, it was to big or the gasket wont allow it to fit, I was a bit suspect of this assumption but the guy said he would order a new windshield and try again in a few days. So he was back today and the same issue. Everytime he went to wedge the windshield in it popped back out. We tried everything from wd-40 to installing the windshield on the gasket then putting the whole thing onto the cab, no luck. This guy seem to be quite knowledgeable in window installation so I dont doubt his know how, but his suggestion was to get a new gasket. Now my question is does everyone/anyone think this is the correct assumption?? Has anyone ran into a problem like this before? I have no problem getting a new gasket (they're only like $40 new) if this will work. CAn anyone shed some light on this???