A 6.0-liter Vortec V8 powers single rear-wheel (SRW)and dual rear-wheel (DRW) models, and both SRW and DRW versions are available with an optional 365-hp 6.6-liter Duramax diesel engine for extra towing capacity. Like all Sierras, the 3500HD is available in a wide array of bed sizes, wheelbases, drive types and cab sizes, as well as a variety of trim levels. Safety features include driver and passenger front air bags, tire pressure monitoring system (SRW only) and four-wheel anti-lock disc brakes. The Sierra 3500HD is visually unchanged from 2008, but adds the availability of Bluetooth, XM NavTraffic and a rearview camera.
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