NEW FOR 2013:

– Bi-fuel compressed natural gas fuel system and 6.0L V-8 bi-fuel engine available on 2500HD extended cab.
– Powertrain grade braking in normal transmission mode for 6.0L V8.
– Paint changes: Sonoma Red Metallic and Heritage Blue Metallic added on non-Denali models.

Going into 2013, the GMC Sierra HD sees a new compressed natural gas system added along with powertrain grade braking for V8 gas models.

The Sierra HD is also sold as the Chevrolet Silverado HD. Light-duty 1500 models are covered in a separate section.

The Sierra HD is available in regular, extended cab and crew cab models, in two- or four-wheel drive, and with a 6.0-litre V8 gasoline engine or available Duramax 6.6-litre V8 diesel. Both use six-speed automatic transmissions: a Hydra-Matic 6L90 with the gasoline engine, and Allison 1000 with the diesel. The 3500 models are available in single-wheel or dual-wheel versions.

Trim lines are the WT, SLE, SLT and Denali.

Features on the WT include 17-inch steel wheels, air conditioning, keyless entry, OnStar with Turn-by-Turn Navigation, heavy-duty cooling package, chrome front and rear bumpers, automatic headlights, manual mirrors and windows, cruise control, front recovery hooks, variable intermittent wipers, overhead console, vinyl floor covering, standard instrument panel with upper and lower glove boxes, driver information centre, tilt steering wheel, driver’s sunshade pocket, passenger sunshade mirror, 40/20/40 split-bench front seat in cloth or vinyl, and AM/FM stereo. The Crew and Extended cab models have a fold-up rear seat. Four-wheel drive models have a lever-operated 4WD transfer case.

The SLE adds chrome wheel centre caps, privacy glass, heated power mirrors, winch-mounted spare tire carrier, carpeting, vinyl floor mats, compass, exterior temperature display, leather-wrapped steering wheel, illuminated vanity mirrors, power windows with driver’s auto-down, premium cloth or leather seats, front locking console in centre seat cushion, and CD/MP3 stereo with auxiliary input. Four-wheel drive models have an electronic rotary dial for the 4WD transfer case.

The SLT adds 18-inch polished aluminum wheels, dual-zone automatic climate control, locking rear differential, electric trailer brake controller, trailer package with receiver, remote starter, fog lights, power-folding mirrors with integrated turn signal, auto-dimming driver’s side and tilt-down in reverse, premium instrument panel with single glove box, auto-dimming mirror, vehicle information centre with customization, steering wheel-mounted audio controls, auto-down passenger window, ten-way power-adjustable heated leather bucket seats, driver’s side memory, Bluetooth connectivity, USB port, premium Bose sound system and XM satellite radio.

The Denali adds colour-keyed front fascia and rear bumper, chrome door handles, heated and cooled front seats, chrome grille, lockable EZ lift tailgate, front and rear floor mats, heated leather-wrapped steering wheel, garage door opener, rearview camera, and six-CD/MP3 stereo. On Extended and Crew models, it also includes power-adjustable pedals and rear parking sensor. Four-wheel drive models add front and rear skid plates.

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