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The 2003 Sierra 1500 Extended Cab is a 4-door, up to 6-passenger full size pickup, available in 9 trims, ranging from the Work Truck Short Box 2WD to the SLE Long Box 4WD. The 2003 Sierra 1500 Extended Cab's closest competitors include the Chevrolet Avalanche, the Ford F-150 Regular Cab 4x2, and the Toyota Tundra 4X4.
Upon introduction, the Work Truck Short Box 2WD is equipped with a standard 4.3-liter, V6, 200-horsepower engine that achieves 16-mpg in the city and 20-mpg on the highway. The SLE Long Box 4WD is equipped with a standard 5.3-liter, V8, 285-horsepower engine that achieves 14-mpg in the city and 18-mpg on the highway. A 4-speed automatic transmission with overdrive is standard on both trims.
The 2003 Sierra 1500 Extended Cab is freshened for 2003.