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Re: Air Dam/Deflector
My 1980 GMC had one on it. It was the only one I had ever noticed on a pre '81 square body. It functions to send more air up into the radiator area.
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TexasJeff
2009 Silver with Linen Interior Cadillac DTS
1990 Red with White Top and Interior Ford Mustang GT convertible
1998 Red with Gray Interior, C3500 Chevy Crew Cab Dually
    
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