2018 GMC Sierra HD Introduction

GMC Sierra HD heavy-duty pickups are closely related to the Chevrolet Silverado HD and are available with more luxurious cabins and features. Most models sold are four-door Crew Cabs with ample room for adults. Of those, most are costly Denali editions with posh appointments.

Following a redesign for the 2017 model year, the Sierra HD has changed little for 2018. Base Sierra HD models get a standard rearview camera and a 7.0-inch touchscreen, while Denali models gain a new grille.

Silverado and Sierra pickups share many powertrain components. The 2500HD has a 3/4-ton rating, versus one ton for 3500HD models.

Sierra HD trucks come in four trim levels: base Sierra, SLE, SLT, and Denali. Regular Cab, Double Cab, and Crew Cab models are available, but Denalis are Crew Cab only. Regular Cabs lack a back seat, while Double Cabs have a narrow rear bench and rear-hinged partial doors for access. Crew Cab trucks have four conventional front-hinged doors.

An 8-foot cargo bed is available with all cab configurations. Double and Crew Cab models can have either a 6.5-foot bed or the 8-foot length. Stripped-down base Sierras come only with a Regular two-door cab and 8-foot bed. Few are sold.

GMC’s standard 6.0-liter V8 makes 360 horsepower and 380 pound-feet of torque, driving a 6-speed automatic transmission. Towing capacity of a Crew Cab rear-drive 2500HD with a conventional hitch reaches 13,000 pounds. Payload tops two tons in some configurations.

Introduced for 2017, the optional 6.6-liter turbodiesel V8 produces 445 horsepower and an energetic 910 pound-feet of torque. Towing capacity can exceed 18,000 pounds, depending on configuration. Roughly 90 percent of Denalis are diesel-powered.

Rear-drive is standard, with four-wheel drive optional. Like other heavy-duty trucks, Sierra 3500HD models are available in single- or dual-rear wheel configurations; 2500HD pickups come only with single rear wheels.

Crash-test results could be better. The National Highway Traffic Safety Administration gave the Sierra 2500HD a four-star rating overall and for frontal impact, but a five-star score in the side-impact test. Rollover protection drew only a 3-star rating – typical of vehicles with tall ride height.

All Sierra HD models include a rearview camera, but advanced safety features are limited. Denali models add standard forward-collision and lane-departure warnings, along with front/rear parking sensors. Those features are extra-cost options on SLE- and SLT-trimmed Sierras. A Teen Driver Alert can report driving behavior of youngsters to parents.

1Dealer Discount applied to everyone.

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