The 2015 Chevrolet Silverado and GMC Sierra HDs – the latest heavy duty trucks from General Motors – have been officially introduced. These trucks are slated to start selling in early 2014, mirroring their 1500 counterparts. The difference is that they are fitted with a power-dome hood, bigger grilles and a one-piece chrome front bumper.
In addition, the models will feature a CornerStep rear bumper and an EZ Lift and Lower tailgate. The entry-level models have the basic equipment but then the top-of-the-line Sierra Denali has a unique grille, LED-infused headlights, body-color bumpers and a polished stainless steel exhaust tip (on petrol models). Furthermore, the model comes with premium leather upholstery, heated and cooled front seats, a Bose audio system and an Intellilink infotainment system with GPS navigation.
These trucks are offered with various engines, which include a 6.0-liter Vortec V8 petrol or bi-fuel engine with 360 bhp (268 kW) and 380 lb-ft (515 Nm) of torque in the 2500 HD and 322 bhp (240 kW) and 380 lb-ft (515 Nm) of torque in the 3500 HD.
GM is also offering a 6.6-liter Duramax V8 diesel with 397 bhp (296 kW) and 765 lb-ft (1,037 Nm) of torque.
When it comes to capability, the trucks offer a top-of-the-class payload capacity of 7,374 lbs (3,345 kg) as well as a conventional trailering rating of 19,600 lbs (8,890 kg) that’s also at the top of its class. These trucks offer an optional fifth-wheel hitch, which has a trailering rating of 23,200 lbs (10,523 kg).
The brand-new Silverado HDs are additionally built to convey new levels of confidence to intense towing through further enhancement of Silverado's available Cruise Control, Auto Grade Braking, and Diesel Exhaust Brake. The incorporation of these components helps the 2015 Silverado HD keep up a set speed up and down grades, even when towing a huge trailer in mountainous terrain.
The client sets the coveted speed, and the truck will do the rest - adding or reducing force, downshifting to add engine braking, and connecting with the exhaust brake on the diesel engine. You feel a great deal of confidence and dominance, since you aren't continually working to stay a step ahead of the truck and trailer.
To initiate the Auto Grade Braking on either gasoline or diesel Silverado HDs, the operator thrusts and holds the Tow/Haul button in the shifter for three seconds. The transmission will then naturally downshift when required to empower engine braking and help slow the vehicle.
Likewise, on Duramax diesel types, the driver can also engage the Diesel Exhaust Brake, which utilizes the variable vanes in the turbocharger to flawlessly and discreetly make additional backpressure in the engine to help moderate the vehicle. The integration of the exhaust brake and the automatic transmission downshifts enables the driver to keep up the coveted speed, even on long, steep highway downgrades.