1979 GMC P4500 w/o AC;. 1980 GMC P4500 w/o AC;. 1981 GMC P4500 w/o AC;. 1982 GMC P4500 w/o AC;. 1983 GMC P4500 w/o AC;. 1984 GMC P4500 w/o AC;. 1985 GMC P4500 Engine: 4.8L L6; w/o AC;. 1986 GMC P4500 w/o AC;.
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