Re: 1960 GMC Napco plow truck.
I think he's referring to the picture of the wheel, it has a square drive inner lug nut on the hub instead of a regular hex nut. That's actually an inner lug nut for the rear duals on a truck with Budd wheels, takes a 13/16" square socket to remove. They must have lost a lug nut and replaced it with that is my guess.
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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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