I know of at least one difference with the Chevy harness. Chevy has both left and right turn signal indicators in the dash while GMC just has one lamp covering both left and right turns. The Chevy harness won't have a wire for the GMC HydraMatic shifter position lamp.
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My Pontiac is a '57 GMC with its original 347" Pontiac V8 and dual-range Hydra-Matic.
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