SLE 6.5' Box 4WD shown
The 1999 All-New Sierra 1500 Extended Cab is a 3-door, up to 6-passenger full size pickup, available in 8... read more trims, ranging from the SL 6.5' Box 2WD to the SLE 8' Box 4WD. The 1999 All-New Sierra 1500 Extended Cab's closest competitors include the Chevrolet C/K 1500 Extended Cab, the Dodge Ram Club Cab 4X4, and the Ford F150 LD SuperCab Styleside 4X4.
Upon introduction, the SL 6.5' Box 2WD is equipped with a standard 4.8-liter, V8, 255-horsepower engine that achieves 16-mpg in the city and 21-mpg on the highway. The SLE 8' Box 4WD is equipped with a standard 4.8-liter, V8, 255-horsepower engine that achieves 15-mpg in the city and 18-mpg on the highway. A 4-speed automatic transmission with overdrive is standard on both trims.
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Trims are variations of a vehicle model produced by the manufacturer. Differences between trims vary greatly between models but may include:
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