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ox can tow up to 20,000 lb with afifth-wheel hitch. The maximumpayload (3500HD) is 6335 lb.New 6.6L Duramax diesel and Allison1000 six-speed comboHelping the new 2011 SilveradoHD trucks deliver is a new versionof the Duramax 6.6L diesel andAllison 1000 six-speed automatictransmission powertrain combination.The Duramax 6.6L’shorsepower and torque areexpected to top previous models(testing is ongoing).The exhaust brake system enablescontrolled vehicle slowdown ondownhill grades without actuatingthe brakes. There’s also B20 biodieselcapability for an alternativefuelling option.Strengthened Vortec 6.0L/Hydra-Matic 6L90 six-speed powertrainThe Vortec 6.0L gas V8 with variablevalve timing returns, alongwith a strengthened version of theHydra-Matic 6L90 six-speed automatictransmission. A new camshaftprofile in the Vortec 6.0L helps theengine produce more torque lowerin the rpm band for improvedlaunch feel and a greater feeling ofoverall performance at higher altitudes(and when towing a trailer).Refined and capable ride, handlingand steeringLonger wheelbases and wider front/rear tracks enhance the ride andhandling characteristics of the Silverado2500HD and 3500HD,giving them a greater feeling ofsmoothness and control.Also enhancing the driving experienceis a revised steering systemdesigned to support the trucks’greater FGAWR. It includes a new,larger steering gear, power steeringpumps and linkages.Safety and functional technologyThe 2011 Silverado 2500HD and3500HD models have a roster ofsafety features and functional technologies,including: StabiliTrakelectronic stability control systemon all single-rear-wheel models;high-strength steel tubular framecross member; seat pelvic/thoraxand head curtain side air bagsavailable on 2500HD; availablerear backup camera; trailer swaycontrol system on all single-rearwheelmodels; hill start assist(standard on SRW models).are designed for work. The Silverado HDs offermobile WiFi, USB and Bluetooth connectivity, XMSatellite Radio and a navigation system. Multiplecharge points enable multiple electronic devices tooperate simultaneously; and, when equipped withthe available navigation system, XM NavTrafficoffers real-time updates of traffic conditions (inselected areas).Cold-weather customers will appreciate the Duramax6.6L’s quick start-up, says Chevy, with a startingtime on par with gas engines. Its glow plug cycle timetakes no more than 3 seconds in temperatures as lowas -29ºC. There’s also a cab heat-up feature thatallows the engine to idle faster in low temperaturesto warm up the interior faster.The Silverado HDs aims to take you farther withoutstopping. A new, 136L fuel tank is standard on allmodels and, with the improved fuel efficiency of thepowertrains, enables a cruising range of up to about1090 km (with the Duramax 6.6L).Drives better, works harderThe interiors boast improved quietnessand attention to detail, butVisioneering_EB_Nov09.indd 111/3/09 10:26:40 AMwww.EBMag.com • April 2010 • 25