[tucsonjwt]

My 76 had the same problem, but on the passenger side. The opening for the windshield gasket is like crimped metal. Up in the right corner the metal was not crimped flat - a small sharp ridge of metal stuck up. The windshield gasket covered it, but there was enough of a gap to allow water to pass through and drip onto the passenger side vent area. It was this way from the factory, so the water collected under the carpet and eventually rusted out the joint between the vent area and the floor. I had to get that whole area repaired (rust on an AZ truck). Safelite installed the windshield, so I took it back to them twice and they put gobs of silicone around the bad area but it did not work. Finally a convinced them to tap that raised area down with a hammer before the gobbed it up again. I sold the truck shortly thereafter so I just assume that the fix worked. I see streaks on both kick panels on my 83, so I don't know if this is another windshield problem or just condensation drips - I have A/C. Unfortunately, you can't tell if you have this problem unless the windshield and gasket are out of the truck. Good Luck.