-Bi-fuel compressed natural gas fuel system/6.0L bi-fuel V8 available on 2500HD crew cab
-4.10 axle standard with gas engines, with 3.73 ratio optional
-available spray-in bed liner

One year before GMC is due to completely redesign its heavy-duty full-size pickup, the the Sierra HD moves into 2014 with minor trim updates.

The Sierra HD is also sold as the Chevrolet Silverado HD; light-duty 1500 versions of the Sierra are covered in a separate buyer’s guide entry.

Available in regular, extended and crew cab bodystyles, the Sierra HD comes with a choice of 6.0L gasoline V8 or 6.6L Duramax diesel V8. Both are paired with a six-speed automatic transmission: gas engines use a Hydra-Matic 6L90, and diesels get an Allison 1000 gearbox.

Trim levels include WT (work truck), SLE, SLT and Denali, all of which can be had in 2WD or 4WD, and with either single- or dual-wheel rear axle.

WT models come standard with 17-inch wheels, air conditioning, keyless entry, OnStar with turn-by-turn navigation, heavy-duty cooling package, chrome bumpers, automatic headlights, cruise control, front recovery hooks, variable intermittent wipers, overhead console, vinyl floor covering, upper and lower glove boxes, driver information centre, tilt steering, driver’s sunshade pocket, passenger sunshade mirror, 40/20/40 split front bench seat in cloth or vinyl, and AM/FM stereo. Crew and extended cab models have a fold-up rear seat, and four-wheel drive models get a lever-operated 4WD transfer case.

SLE trim 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, locking front console, and CD/MP3 player with auxiliary input. Four-wheel drive models get an electronic dial transfer case control.

SLT models get 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 mirror with tilt-down-in-reverse, upgraded instrument panel, auto-dimming rearview mirror, customizable driver information centre, steering wheel-mounted audio controls, auto-down passenger window, ten-way power heated leather bucket seats, driver’s side memory, Bluetooth, USB input, premium stereo and satellite radio.

Top-trim Denali models get colour-keyed front fascia and rear bumper, chrome door handles, heated and cooled front seats, EZ-lift tailgate, floor mats, heated steering wheel, garage door opener, backup camera, and six-CD/MP3 stereo. Extended and crew cab models add power-adjustable pedals and rear parking sensor; four-wheel drive models add front and rear skid plates.

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