With impressive power, tough frames, advanced suspensions and high-capacity brakes, Chevy Silverado Classic 2500HD/3500 Series provides outstanding payload capacities as well as outstanding hauling and towing capabilities. The 2500 HD models have a GVWR of as much as 9,200 pounds (4,173 kg), and payloads of up to 4,058 pounds (1,841 kg). The 3500 Series pickup models have a GVWR of up to 11,400 pounds (5,171 kg) and payloads of up to 5,511 pounds (2,500 kg), when equipped with dual rear wheels.

For chassis cab models, Silverado Classic HD has an 11,400-pound (5,171-kg) GVWR for 2WD versions and a 12,000-pound (5,443 kg) GVWR when equipped with 4WD. Chassis cabs provide payloads up to 6,226 pounds (2,824 kg).



Duramax 6.6L turbo-diesel

An all-new version of the Duramax 6.6L turbo-diesel V-8 engine was introduced during the '06 model year and paired with the Allison 1000 six-speed automatic transmission. In this configuration the engine delivers 360 hp (268 kW) at 3200 rpm and 650 lb.-ft. of torque (881 Nm) - more power with lower emissions than the previous diesel engine. Peak torque is achieved at 1,800 rpm.

The Duramax 6.6L's horsepower and torque increase and emissions reduction are enabled by a strengthened iron cylinder block and a lower compression ratio. The lower compression reduces stress on the engine by reducing the peak cylinder firing pressure. This, in turn, allows more fuel to be burned - more fuel means more power - while the lower compression helps reduce NOx emissions. Lower compression also helps reduce noise and vibration, making it a quieter and smoother engine.

A revised variable-geometry turbocharger also enhances the driving experience of the Duramax 6.6L. Aerodynamic changes to the turbo's impellers help tailor controlled application of turbo power for seamless and immediate response at full throttle. The turbo, which spins at up to 120,000 rpm, is high-speed-balanced, reducing vibration and resonance - and contributing to the engine's overall smoothness and refinement. The revised turbo also helps reduce emissions, while maximum boost remains at 20 psi.

The Duramax 6.6L also has an intake air heater to reduce smoke and emissions during cold or light-load driving. The system features a 600-watt grid heater located in the air intake duct, which is triggered automatically by the engine controller. It heats up the incoming air to speed warm-up of the engine.

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