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Update: New Door Seals
Just before the winter weather hit the midwest, we had a warmish weekend. I took advantage of a rare free Saturday to install new door seals on the C10. I used push-on style seals from Brothers. The new seals are definitely tighter than the crumbling original seals and, just like the clutch fan, the new seals changed the tone/drone of the cab, but they didn't do much to quiet the cab down.
With the new door seals installed, I took the truck for another test drive. At 60mph, no heater fan, no radio, the sound level was still at 72db. The one variable was the wind. There was a 20mph cross wind that day that very well may have added to the cab noise. My previous test drive sound tests were done on calm days. I'll test the sound level again if we ever get another calm day...
John
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