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You would need to look at the RPO codes on the sticker in the glove compartment. If it's a 4x4, you most likely have either 3.73 (GT4) or 4.10 (GT5) ratios. 3.08 (GU4), 3.42 (GU6), and 3.55 (GV0) are also seen sometimes. The best way to know for sure is to call the service department of a GMC dealership, give them the VIN number, and they can look up the build sheet.

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