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I think they only made Sierras and Sierra Grandes in the 67-72 years, and I think the High Sierras started in '73 but I'm not an expert on GMC stuff. Can you get a pic of it?
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RJD
1984 Chevrolet C30 welding truck 454/SM465
1977 GMC C15 pickup 350/TH350
1970 Chevrolet C20 pickup 350/TH400
1970 Chevrolet K20 Suburban 454/TH350
1969 GMC 8500 478M V6/5 spd winch truck
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