The refreshed Silverado HD will be offered in work truck, LT and LTZ trim levels, with production set to start in May. First deliveries are expected in early June, 2010.
Read more »
Featuring the same mechanical tweaks as the latest Silverado, the GMC Sierra enters the 2011 model year with a new 6.6L Duramax turbo diesel, suspension and brake upgrades as well as a new Denali version.
We already knew about the 6.6-liter V8 diesel from the Silverado, but GM has now released output figures for the new engine that delivers 397 horsepower at 3,000 rpm and 765 lb.-ft. of torque (1,037 Nm) at 1,600 rpm.
The most significant change to the 2011 Silverado is the all-new, fully-boxed frame assembly. GM says that the bending and beaming stiffness of the frame is increased 92 percent and 20 percent, respectively, with the fully boxed sections enhancing torsional stiffness by a factor of five.
There's also a redesigned independent front suspension system that offers up to a 25-percent greater front axle weight rating – up to 6,000 pounds (2,721 kg) front gross axle weight rating (FGAWR), while at the back, there's new, larger asymmetrical leaf-spring design.
The standard four-wheel disc system has also been upgraded with a set of larger 14-inch front and rear rotors while Duramax-equipped models now get a new exhaust brake system.
Under the hood, GM re-engineered the Duramax 6.6-liter V8 diesel delivering more power and torque along with an 11 percent increase in fuel economy on the highway.
The Duramax is linked to an Allison 1000 six-speed automatic transmission that has been strengthened to handle the higher torque capability of the improved diesel engine.
The company said that with the Duramax/Allison combination, preliminary testing showed 0-60 mph times of less than 9 seconds and quarter-mile times of less than 16 seconds in 2500HD models. That's about 0.3-second and 0.5-second quicker, respectively, than previous models.
For those that prefer gasoline fuel, the Vortec 6.0-liter V8 with variable valve timing returns to the new heavy-duty trucks, along with a strengthened version of the Hydra-Matic 6L90 six-speed automatic transmission.
Detailed specifications on both engines are to be released at a later date.
So what does all this mean in terms of towing and payload capability? According to GM, the maximum conventional (ball hitch) towing rating has been increased to 16,000 pounds (7,257 kg), while the 3500HD crew cab/long box can tow up to 20,000 pounds (9,091 kg) with a fifth-wheel hitch. The maximum payload capability for the 3500HD is 6,335 pounds (2,873 kg).
As for the styling updates, most will find it hard to spot the differences as they are limited on the outside to a power dome-style hood with a new, louvered design, restyled grille and full-width chrome steel front bumper plus a new lineup of 17-, 18- and 20-inch wheel/tire combinations.
The new Silverado will go on sale in the States this summer.
