If an airbag deploys, OnStar contacts an adviser and can report crash data to emergency services.
New-truck buyers get a one-year subscription to the Safe and Sound Plan, after which owners can subscribe annually. GM is aggressive in promoting the benefits of OnStar 8.0. Flex-fuel 403-hp, 6.2-liter V-8 with aluminum block/cylinder heads, cam-in-block and two valves per cylinder that makes 417 pounds-feet of torque.Flex-fuel 315-hp (gas) or 326-hp (E85), 5.3-liter V-8 with aluminum block and cylinder heads, cam-in-block, two valves per cylinder and 338 pounds-feet of torque (gas) or 350 pounds-feet of torque (E85).Flex-fuel 315-hp (gas) or 326-hp (E85), 5.3-liter V-8 with iron block and aluminum cylinder heads, cam-in-block, two valves per cylinder and 338 pounds-feet of torque (gas) or 350 pounds-feet of torque (E85).302-hp, 4.8-liter V-8 with iron block and aluminum cylinder heads, cam-in-block, two valves per cylinder and 305 pounds-feet of torque.195-horsepower, 4.3-liter V-6 with iron block and cylinder heads, cam-in-block, two valves per cylinder and 260 pounds-feet of torque.Available rear-seat entertainment system.Available navigation system on SLE and SLT.The SLT also gets a Bose stereo, a 10-way power-adjustable driver’s seat and a heated windshield-washer system. Leather seating is available on the SLE and standard on the SLT. The Sierra’s cab is inviting, spacious and well-organized. The SLT offers upgraded materials and a different dash design. Work Truck and SLE models are more utility-minded, with large controls and door handles that can be operated while wearing gloves. The Sierra showcases two different interior designs. Very wide rear-door openings on extended cab models to load passengers, cargo.There’s also a strong family resemblance with the Chevy Tahoe/Suburban. While GM is trying to differentiate the Silverado and Sierra, the common silhouette is hard to overcome, even with unique front fenders, grille, bumpers, headlamps, cargo box and taillamps. Standard side curtain and side-impact airbags are welcome safety additions.
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Those with portable MP3 players can connect and play their music collections with the truck’s audio system through a USB connection. Also, the 4.8-liter and 5.3-liter V-8 engines have been enhanced, with variable valve timing for improved emissions and better fuel economy. The rest of the Sierra’s eight-cylinder lineup benefits from increased availability of its new six-speed transmission for regular and extended cab models equipped with the 5.3-liter V-8. GM has dropped the long-running 6.0-liter V-8 engine from the Sierra lineup, leaving the powerful 6.2-liter V-8 for heavy towing needs. Most V-8 models are rated to tow around 9,000 pounds, but some models get more than 10,000 pounds with an enhanced trailering package. The Sierra comes in four trim levels: Work Truck, SL (crew cab only), SLE and SLT. All configurations are available in two- or four-wheel drive.
Standard (6-foot, 6-inch) and long (8-foot) cargo beds are available on regular and extended cabs, while the crew cab gets a short (5-foot, 9-inch) bed. The Sierra comes in regular, extended and crew cab forms. There are five engines and five suspensions in the lineup. There might be slight differences in curb weight and payload, but they share the same powertrain and chassis components. The GMC Sierra 1500 and Chevrolet Silverado share the same platform, but the GMC product is often positioned as a more upscale offering.
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