It's hard to add a few hundred pounds to the chassis and rotating mass (wheels, tires, brakes) of a pickup truck without adversely affecting ride, but the 2011 Silverado HD rides as well as its predecessor while capable of towing and carrying more. Some of the credit goes to the standard 17-inch wheels and larger tires needed to clear the bigger brakes and carry the extra weight.
The 6.0-liter V8 gasoline engine delivers 360 horsepower in 2500-series pickups and 322 hp in most other applications, all on Regular-grade gas. Torque is rated at 380 lb-ft for all applications and it peaks at 4200 rpm, so it must downshifting a gear or two for grades, and if you plan on towing anything spend the $100 on the 4.10:1 axle ratio; you'll get better performance, perhaps a higher tow limit, and any impact on your fuel economy will be negligible. If you're on a strict budget, don't tow anything more than a job-box trailer or weekend boat, or don't do a lot of miles, this is the more practical engine choice.
Silervado's six-speed automatic transmission has a Tow/Haul mode, best employed when your truck and trailer combo weigh 75 percent or more of the maximum combined load (GCWR). It also has a thumb-switch with which you can shift up/down manually after moving the selector to M, and a selector position for 1; Ford uses a similar approach while the Ram has only the thumb-switch that does require moving the selector level first.
With at least 380 hp and 400 lb-ft of torque, both 2011 Super Duty and 2010 Ram HD standard gas engines out-power the GM 6.0-liter, yet performance is similar; it's not a huge power gap, however: The Ram has only a five-speed automatic and the Ford is often heavier. All three trucks pair the gas engine only with an automatic.
The Duramax diesel is a 6.6-liter V8 with 397 hp and 765 lb-ft of torque coupled to an Allison six-speed automatic transmission. This is the highest-rated diesel at this time, a bit quieter than its predecessor and a whole lot more potent even given the truck's added mass. To get more than double the torque of the gas engine, and the Allison upgrade, will cost about $8400, the payoff being superior towing ability, better at-altitude performance and better fuel economy: We managed 10 mpg in a dually crew cab pulling an 8000-pound trailer through the interstates of Appalachia. Over the same stretch, a single-rear-wheel Crew Cab, gas engine, no trailer averaged 12.2 mpg with the same personnel count on board. Note the 2011 diesel does use a DEF (diesel exhaust fluid) additive that must be replenished (usually at service intervals, and available at many service stations and most truck stops); Ford's Power Stroke uses a similar system while the Ram Cummins does not. The Duramax is B20-biodiesel approved.
An HD Silverado drives heavy, as in a solid feel and deliberate control inputs. It is confident empty or with a maximum load on board, the added frame stiffness making suspension tuning easier for GM engineers. We drove a Regular Cab empty over some marginal roads and the ride wasn't punishing at all. On longer cabs a special body mount is used at the back for even better ride quality, but as is always the case the wrong wheelbase on the wrong set of expansion joints can still result in some bobbing; this situation is not unique to GM pickups.
The Silverado HD is not a play truck for cowboy posers, it's designed to work. Everything underneath has been changed for 2011 with a focus on doing more work. If you want light controls, quiet, and a smoother ride get a Cadillac Escalade EXT pickup. Standard tires on Silverado dually are 17-inch Michelins, but 2500-series trucks offer a choice of 18-inch Bridgestone/Firestone or 20-inch Goodyears; our choice for ride, quiet, work, and replacement cost are the 17 or 18-inch setups.
As the only heavy-duty pickup with independent front suspension on 4WD models, the 4WD Silverado HD and Sierra HD steer with a bit more precision and absorb front-end road impacts better. GM has an adjustable trim height for the torsion bars to adjust ride height for added weight such as a snow plow, but most torsion bar vehicles are adjustable. Any Silverado HD may be equipped with a snow-plow package but we'd check with your dealer about front-end alignment if adding a camper or plow for many miles.
Brakes are all new with bigger vented discs and better pedal feel and reaction than prior years. If you tend to drive quickly note that empty HD pickups don't generally stop any better than those carrying some load on the rear wheels.
Single-rear-wheel models have StabiliTrak (GM's name for electronic stability control) which incorporates hill-start assist. This means the truck won't roll backwards on an incline if you take your foot off the brake to put it on the gas, but to generations who left-foot brake it won't make any difference.
An integrated trailer brake controller is available to slow your trailer much more comfortably and more controlled than an aftermarket controller can. The diesel has a built-in exhaust brake function (matching Ford and Ram now) and the transmission has grade control logic that will, with cruise control or a tap of the brake pedal, work automatically to maintain or slow your speed. If you push the right buttons the truck will more or less take care of everything else.
A 2.5-inch receiver hitch allows conventional trailer ratings to 17,000 pounds, eclipsing any competitive pickups at post time; the maximum for fifth-wheel trailers on properly equipped Silverado HD models is now 21,700 pounds, up by 5000 pounds. The strongest Silverado HD will haul more than 29,000 pounds of truck, cargo, and trailer. As with virtually all full-size pickup ratings, the HD with the highest payload may not pull the heaviest trailer.