The Sierra is comfortable inside, but its seats could be a lot better. Although there are a few configurations, front seats are wide and flat, and they could use more lateral support. Meanwhile the back seats in Crew Cabs tend to be underpadded, with a seatback that's tilted too far upright.
Five-seat trucks have a wide center console with astounding storage capacity, while six-passenger versions get a simpler dash and a front bench seat. Both versions have clear displays and big controls, meant to be operated with work-gloved hands. Regular-cab versions have a little storage space behind the front seats, and Extended Cabs have just enough space behind rear-hinged access doors for a toolbox and work gear.
Bed lengths vary by model. Hybrids and Crew Cabs have a 5'8" bed; a 6'6" bed can be selected on any style except the Hybrid, as can an 8' bed. It's been about six years since the GMC Sierra got its last full redesign for the model year , but this truck's rather formal, conservative look has stood well to the test of time.
Just as its Chevrolet sibling, the Silverado , the Sierra is very conservative from the outside, and it doesn't depend on a lot of styling tricks to convey what it's selling--durability, dependability, toughness. The big rectangular grille is simplicity itself, and the corners are just a bit more pronounced than on the essentially identical Silverado. With the big GMC logo on the grille, there's little risk of mistaking the Sierra for any other model, but from the side or rear, it can appear just a little too plain for some tastes.
That plainness is a pleasing contrast to some buyers next to the somewhat overwrought Toyota Tundra toe a weirder line, and while the Ram gets even softer and more carlike on the inside for , it remains intimidatingly for some, embarrassingly tall and tough on the outside. The Sierra's interior is where it's starting to look a bit dated. Less expensive versions still sport a simple, upright design with larger controls and door handles--taking aim at those who want a work-duty truck--while pricier versions get a cabin that feels almost directly borrowed from GM's full-size SUVs like the Chevrolet Tahoe.
With the latter design comes a lower, smoother instrument panel design, with materials and trims upgraded accordingly. The only trims that don't quite fit are the woodgrain ones, which are neither convincing on a luxury basis or fitting in with the Sierra's mission. The GMC Sierra still compares well to most other full-size pickups, especially in terms of handling, although its base V-6 isn't quite up to snuff. With four different gasoline engines as well as a gasoline-electric Hybrid model on offer, the Sierra allows plenty of room for the widely varied needs of truck shopper--some looking for low-cost fleet truck, others seeking a personal-luxury vehicle capable of towing a large boat, for instance.
The base 4. While the price is good, fuel economy isn't so impressive with the four-speed automatic--the sole transmission offered--and it strains to extract power from the six.
The next step up is a a flex-fuel 4. For most buyers, the flex-fuel-capable 5. Standard in the fuel-saving Xtra Fuel Economy XFE models and optional on other Sierras, this engine delivers a ripe exhaust note, smart acceleration and the best non-hybrid fuel economy of the lineup.
It pairs with a six-speed automatic that shifts pretty smoothly, and helps it get that improved fuel economy while cutting down on noise. It can run on E85 and is identical to the V-8 found in the Cadillac Escalade. Acceleration is downright blistering when there's no cargo, and gas mileage is predictably very low. But it remains the best choice for those who tow heavy loads regularly. Across the entire lineup, the Sierra can be had with either rear- or four-wheel drive; a single-range transfer case is standard on base versions, while dual-range 4WD is an option.
An "Autotrac" electronically controlled four-wheel-drive system is featured on Denali models. Towing ratings range up to 10, pounds. Altogether, it makes the equivalent of horsepower and pound-feet of torque, giving the Hybrid acceleration pretty close to that of models outfitted with the 5. There's an eerie smoothness to the way in which the Hybrid's powertrain goes about its business, and it can go about 25 mph for short distances with electric power alone.
About the only thing we don't like as much about the Hybrid is that its electric power steering is more vague in feel. The GMC Sierra isn't quite as comfortable as some of its direct competitors, although cabin quality remains top-notch across most of the model lineup. Rather flat, wide, and unsupportive front seats are at the root of why we find the Sierra not to be all that comfortable--especially for longer trips--even though they do fit wide folks quite well.
Crew Cab models also have a back seat that's more thinly padded than expected, with a seatback that's too close to vertical. Six-passenger versions have a higher, more workmanlike dash that leaves enough space beneath for a middle passenger to find decent leg room.
The Sierra can also be configured as a five-seater, one with a large center console that splits front passenger space, while it also give the dash a more upscale appearance. Big controls and clear displays make the Sierra's climate and audio systems easy to decipher. In back, there's less good news. Three different body styles are available, as well as three different bed lengths 4'-8", 6'-6", and 8' , with the standard Regular Cab having very little space behind its front seats for anything other than narrow objects.
The Extended Cab gets a bit more room--enough for gear and tools--and a pair of rear-hinged access panels to make that space more accessible. Sierra Crew Cabs have four front-hinged doors that can accommodate up to six passengers. The GMC Sierra has a puzzling mix of crash-test scores that might put some doubt into your mind, although its list list of safety technology is reassuring.
On the other hand, the Insurance Institute for Highway Safety IIHS calls the Sierra's front-impact protection "good," and says its side protection is "acceptable"--but in a new roof-crush test, the Sierra gets a "marginal" rating.
Side curtain airbags, stability control, and anti-lock brakes are included in all Sierra models, as is OnStar hardware. Power-adjustable pedals may help very short drivers get more comfortable, and we do recommend the optional rearview camera system, which can help visibility over the tall tailgate when backing up.
Truck shoppers considering the Sierra have vastly different expectations and needs, so it's not surprisingly that this truck comes in hundreds of different configurations, with choices for everything from powertrains, body styles, bed lengths, trim levels, and options.
On one hand, you can get a Sierra that merely does the task as a work truck; or you could pay thousands more for a rugged off-road-capable truck or a lavish tow rig. Most Sierras have a standard USB port and an auxiliary jack for media player connectivity; Bluetooth is offered, too. More expensive Sierras now can be had with DVD navigation and real-time traffic data; a sunroof and a power-sliding rear window; inch wheels; leather upholstery; even a factory-installed bedliner.
And at the top of the line, the Denali includes Bose premium audio, heated-and-cooled power front seats, a heated steering wheel, power-adjustable pedals, remote start, a universal remote, dual-zone climate control, rear parking assist, a trailering package, and skid plates.
Hybrid models are equipped nearly as well as the Denali with a navigation system, Bose audio, and leather in a Premium version , while for off-road specialists, the Sierra's All-Terrain package adds on tow hooks, skid plates, and rescue fittings.
The GMC Sierra Hybrid is one of the most fuel-efficient full-size pickup trucks--although neither the base V-6 versions nor the other V-8 are particularly frugal. Just behind that, however, is the 5. Both the V-6 versions and those with the 4. Research By Category Body Style. Fuel System Electronic Fuel Injection. Engine Oil Cooler NA. Displacement 6. Clutch Size in NA. First Gear Ratio :1 4. Sixth Gear Ratio :1 0. Transfer Case Model NA. Trans Description Cont. Fourth Gear Ratio :1 1. Second Gear Ratio :1 2.
Reverse Ratio :1 3. Again NA. Fifth Gear Ratio :1 0. Trans Type 6. Third Gear Ratio :1 1. Brake Type Pwr. Front Brake Rotor Diam x Thickness in Disc - Front Yes or Yes.
Rear Drum Diam x Width in Disc - Rear Yes or Yes. Drum - Rear Yes or Yes. Steering Type Pwr. Turning Diameter - Curb to Curb ft Steering Ratio :1 , On Center Steering Ratio :1 , At Lock 3. Spare Tire Capacity lbs Front Tire Capacity lbs Rear Tire Capacity lbs Front Wheel Size in 20 x 8. Spare Wheel Material Steel. Front Wheel Material Steel. Rear Wheel Size in 20 x 8. Rear Wheel Material Steel. Stabilizer Bar Diameter - Front in 1. Suspension Type - Front Independent. Axle Type - Rear Semi-Floating.
Shock Absorber Diameter - Front mm 1. Spring Capacity - Rear lbs Axle Ratio :1 - Front NA. Suspension Type - Rear 2-stage multi-leaf. Shock Absorber Diameter - Rear mm 1. Axle Type - Front Independent. Axle Ratio :1 - Rear 3. Spring Capacity - Front lbs Axle Capacity - Rear lbs Safety Features Safety. Air Bag-Frontal-Driver Yes. Air Bag-Frontal-Passenger Yes. Brakes-ABS Yes. Daytime Running Lights Yes.
Traction Control Yes. Night Vision No. Rollover Protection Bars No. Fog Lamps Yes. Parking Aid Yes. Tire Pressure Monitor Yes. Back-Up Camera Yes. Stability Control Yes. Daytime Running Lamps with automatic exterior lamp control Air bags, frontal, driver and right-front passenger with Air bags, head curtain side-impact, front and rear outboard Air bags, seat-mounted side-impact, driver and right-front OnStar, 6 months of Directions and Connections plan includes, Door locks, rear child security.
Tire Pressure Monitor System does not apply to spare tire. Warranty Warranty. Basic Years 3. Corrosion Years 6. Drivetrain Years 5. Roadside Assistance Years 5. Other Specs Cooling System. Maximum Alternator Watts NA.
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