Do you have a 3+3 Crew Cab Model? I had a 75 3/4 ton 3+3, they weren't that common but they also weren't rare. I don't believe GM would go to all the expense of producing only one for the model year. It might be a late production run vehicle, as they had to make the dies for the p.u. cab, other wise everything was already being used in the production of the trucks, Suburbans, and Blazers.
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