They make a screen to go under the cowl. I am sure that some of the vendors on this board carry them. I don't think that what you describe is the difference between the newer and older vehicles. All newer vehicles automatically run the A/C compressor any time you are using the defrosters. This acts as a dehumidifier for the air, and makes the defogger/defroster much more effective. I don't have any problem with the defrosters in these trucks, you just have to keep it on the hottest setting. Also, many of these old trucks have water leaks, and thus have permanently soaked carpeting which introduces a lot of moisture into the cab. If the truck is dry inside, you will have a lot better luck keeping the windows clear.
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Tim
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