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What transmission is in the2003 Chevy Silverado hd1500 4x4?

The 2003 Chevy Silverado HD 1500 4x4 could have come with either a 4L60-E four-speed automatic transmission or a NV4500 five-speed manual transmission, depending on the specific options chosen when the truck was ordered. There's no single definitive answer without knowing the truck's specific build sheet or VIN.