When General Motors last overhauled the Chevrolet Silverado HD and GMC Sierra HD chassis in 2011, we joked that they became some of the best trucks no one knew about. The reason for this was the aging body and interior remained identical to the old truck, falling behind that of the competition, while the foundation had some of the best bits in the business. With the 2015 model year, all that will change as the robust chassis finally gets the worthy interior and styling it’s been waiting for.
The familiar chassis remains basically untouched for 2015 Chevy Silverado and utilizes the only independent front suspension setup in the heavy-duty market. With torsion bars up front and the asymmetrical leaf springs out back, there aren’t any surprises with the Chevy Silverado and GMC Sierra’s layouts. All HDs receive a short-long arm front suspension with forged steel upper and cast-iron lower arms for exceptional durability. No air springs are available, but to maintain ride quality, a two-stage rear leaf setup is used on 2500s, while 3500s benefit from a three-stage design. The only major difference to the fully boxed and hydroformed frame is the more extensive use of high-strength steel in strategic areas.
Also untouched for the 2015 model year is the 6.6L Duramax V-8. Still mated to a six-speed Allison transmission, the Duramax continues to be rated at 397 hp and 765 lb-ft of torque, numbers that -- at least on paper -- fall short of the competition. However, representatives from each respective GM brand will be quick to point out that trucks are driven in the real world (not on spec sheets), and they feel they put as much, or more, usable power to the road as any truck, alleviating any fears that Chevy or GMC fans will be left behind by their Ford- or Ram-driving counterparts.
They make a valid point, as the GM twins sport the segment’s best 7,374 pounds of max payload capacity and the best conventional tow rating of the Big Three at 19,600 pounds. Only the fifth-wheel numbers fall short, maxing out at 22,500 pounds, far below Ram’s 30,000-pound model.
High-strength steel is now used in about two-thirds of the body structure, improving strength and lessening unwanted noise, a major focus during development. With engineers working hard on a quiet driving experience, the trucks have been tuned in the wind tunnel to improve aerodynamic efficiency and decrease wind noise. The results are a new body that has inlaid and triple-sealed doors, and one of the quietest cabins available today. The improved airflow allows for better thermal management of the powertrain and lets the Duramax maintain full power, even under load and at altitude.
Even the cargo boxes, which are available in either a 6-foot, 6-inch or 8-foot length have been improved, and strengthened. Similar to the beds on the ½-ton Silverado and Sierras, the boxes feature two-tier loading capability, integrated tie downs, and an optional EZ Lift-and-Lower tailgate. Access to the bed has been improved with the addition of a CornerStep rear bumper.
Beyond the new styling and body improvements, the cabs are available in regular, double (replacing the extended cab and now featuring forward-hinged doors), and traditional crew. The rear doors are longer, and thanks to revised seats, the back seating positions now have an additional 2 inches of rear legroom. Front seat occupants are rewarded with a well-laid-out instrument panel shared with the ½-ton trucks. A six-gauge cluster and driver information center report vital information to the driver, while a new 8-inch touch screen brings a level of user friendliness to the onboard technology never imagined with the old system.
Speaking of technology, the Silverado and Sierra are packed full of it. A fully kitted truck will net you easy-to-use navigation, MyLink (Chevy) or IntelliLink (GMC), 4G LTE connectivity with WiFi hot spot functionality, and a host of ports and power outlets that would put your desktop to shame. For example, the center console houses a large storage cubby (one of many) with a 110-volt outlet, five USB ports, and an SD card slot. No one will be fighting over charging ports in this truck.
For those Chevy and GMC fans who have been holding out for an update, we think you’ll find that the new trucks will exceed your expectations. With a fresh look and tons of new features, GM can once again be proud the company has trucks that can go toe to toe with the competition. In fact, we have plans in the works to test the Big Three in a shootout later this year, and see just how well these new HDs match up to their cross-town rivals in the real world.