Silverado's frame is the stiffest and lightest truck frame General Motors has ever built. The front frame rails are hydroformed, a process that uses high-pressure hydraulics to shape large and complex components that used to be fabricated from smaller stampings. Tubular crossmembers and roll-formed mid-rails increase rigidity even more. This stiff structure enhances handling and ride quality immensely, while improving crashworthiness.The front suspension comprises aluminum upper and lower control arms, with coil springs on two-wheel-drive 1500s. Torsion bars are used on all 4x4 models and 2500 models. Brakes are large, heavy-duty discs on all four corners. ABS is standard on all models. The V8 engines are based on the new GM SB-2 small-block architecture that was introduced on the Corvette four years ago and extended to the Camaro and Firebird in 1999. A five-speed manual gearbox is standard in the base truck, but most buyers will opt for the 4L60E and 4L80E four-speed automatics. These feature a delayed-upshift mode for towing. They are excellent transmissions.
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