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generation1999–2006

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GMC
Sierra
GMT800

GMC Sierra Sierra (GMT800)

Years: 1999–2006
Code: GMT800

Trims

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Last updated 7 November 2026

Factory specs for every car since 1990, with the source behind each number.

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About the data

Data: Wikidata (CC0), NHTSA vPIC, EPA fueleconomy.gov, EEA. Photos: Wikimedia Commons, credited under each image.

Values with a dashed ring come from AI knowledge and have not been checked against a source.