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The 1999 Current-Generation Sierra Crew Cab is a 4-door, up to 6-passenger full size pickup, available in 6 trims, ranging from the 3500 8' Box 2WD to the 3500 6.5' Box 4WD. The 1999 Current-Generation Sierra Crew Cab's closest competitors include the Chevrolet C/K 3500, the Ford F350 SD DRW Crew Cab LWB, and the Ford F350 SD SRW Crew Cab SWB.
Upon introduction, the 3500 8' Box 2WD is equipped with a standard 5.7-liter, V8, 255-horsepower engine. The 3500 6.5' Box 4WD is equipped with a standard 7.4-liter, V8, 290-horsepower engine. A 5-speed manual transmission with overdrive is standard on both trims, and a 4-speed automatic transmission with overdrive is optional.