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Not much anymore, just trim and interiore are usually different. Back in the day a GMC was just a little fancier than a Chevy, just like Ford was with Mercury. Also, GMC used to use different engines than Chevys, but I think the last of this was in the early seventies, but even in the sixties you could find Chevy engines in GMCs. I could go on for forever with the history, but I think this answers the question well enough. Hayden

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17y ago

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