Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Crew Cab Short Box |
| Type (Engine) | Denali 6.2 Vortec V8 (403 Hp) AWD Automatic FlexFuel |
| Start of production | 2009 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 19.6 l/100 km (12 US mpg, 14.4 UK mpg, 5.1 km/l) |
| Fuel consumption (extra urban) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg, 8.1 km/l) |
| Fuel Type | Petrol / Ethanol – E85 |
| Power | 403 Hp @ 5700 rpm |
| Power per litre | 65.4 Hp/l |
| Torque | 565 Nm @ 4300 rpm (416.72 lb.-ft. @ 4300 rpm) |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L9H |
| Engine displacement | 6162 cm3 (376.03 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 103.25 mm (4.06 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 10.5:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Valvetrain | OHV |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant capacity | 11.9 l (12.57 US qt | 10.47 UK qt) |
| Max. weight | 3175 kg (6999.68 lbs.) |
| Trunk (boot) space – maximum | 1506 l (53.18 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal | 21.56 UK gal) |
| Permitted trailer load with brakes (12%) | 4218 kg (9299.1 lbs.) |
| Length | 5844 mm (230.08 in.) |
| Width including mirrors | 2031 mm (79.96 in.) |
| Height | 1875 mm (73.82 in.) |
| Wheelbase | 3645 mm (143.5 in.) |
| Ride height (ground clearance) | 229 mm (9.02 in.) |
| Minimum turning circle (turning diameter) | 14.4 m (47.24 ft.) |
| Approach angle | 15.3° |
| Departure angle | 22.4° |
| Ramp-over (brakeover) angle | 19.3° |
| Drivetrain Architecture | All wheel drive (4×4) |
| Number of gears and type of gearbox | 6 gears, automatic transmission Hydra-Matic |
| Front suspension | Independent coil spring |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 330×30 mm |
| Rear brakes | Disc, 343×20 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 265/65 R18; 275/55 R20 |
| Wheel rims size | 8J x 18; 8.5J x 20 |
The GMT900 Sierra 1500 represented a significant overhaul for GMC’s full-size pickup line. Introduced in 2007 as a 2008 model, it continued through 2013, receiving updates throughout its lifespan. The Crew Cab configuration offered a spacious interior with four full-size doors, making it a popular choice for families and those needing passenger space alongside cargo capacity. The short bed provided a balance between cargo volume and maneuverability. The Denali trim level, introduced in 2010, elevated the Sierra 1500 with premium features and a more luxurious aesthetic. The 6.2-liter Vortec V8 engine, coupled with the Hydra-Matic six-speed automatic transmission and all-wheel drive, was the top-tier powertrain option, designed for those requiring substantial power and all-weather capability.
Powertrain & Engine Architecture
The heart of the Sierra 1500 Denali was the L9H 6.2-liter Vortec V8 engine. This engine featured a cast iron block with aluminum cylinder heads, utilizing a traditional overhead valve (OHV) valvetrain. The engine employed multi-port fuel injection, delivering fuel directly to each cylinder. The 6.2L engine produced 403 horsepower at 5700 rpm and 417 lb-ft of torque at 4300 rpm. The Hydra-Matic 6L80 six-speed automatic transmission was specifically chosen to handle the engine’s substantial output. This transmission offered smooth shifting and optimized gear ratios for both towing and fuel efficiency. The all-wheel-drive system was an automatic, on-demand system, engaging the front wheels when rear wheel slip was detected, providing enhanced traction in various conditions. The FlexFuel capability allowed the engine to run on gasoline or a blend of up to 85% ethanol (E85).
Driving Characteristics
The 6.2-liter V8 and six-speed automatic combination delivered strong acceleration and impressive towing capacity. While not as nimble as smaller pickups, the Sierra 1500 Denali offered a comfortable and confident driving experience. The automatic transmission was well-tuned, providing smooth shifts and responsive downshifts when needed. The all-wheel-drive system provided excellent traction in inclement weather, enhancing stability and control. Compared to the standard 5.3-liter V8, the 6.2-liter offered a noticeable increase in power and torque, making it ideal for hauling heavy loads or towing trailers. Compared to the available diesel options, the 6.2L V8 provided quicker acceleration but generally lower fuel economy. The gear ratios in the 6L80 transmission were optimized for both highway cruising and low-end torque for towing.
Equipment & Trim Levels
The Denali trim level came standard with a host of premium features. Interior appointments included leather upholstery, heated and ventilated front seats, and woodgrain trim. Standard technology included a Bose premium sound system, a navigation system, and a rear-seat entertainment system. Exterior features included chrome accents, unique Denali badging, and power-adjustable pedals. Optional extras included a sunroof, upgraded wheels, and various driver-assistance features. The Denali trim was designed to compete with luxury-oriented pickups from other manufacturers, offering a refined and comfortable driving experience.
Chassis & Braking
The GMT900 Sierra 1500 utilized a fully boxed frame for enhanced rigidity and durability. The front suspension featured independent coil springs, while the rear suspension employed a traditional leaf spring setup. This configuration provided a comfortable ride while maintaining a respectable payload capacity. The braking system consisted of ventilated discs at all four wheels, with ABS (Anti-lock Braking System) as standard equipment. The Denali trim typically featured larger brake rotors for improved stopping power. Steering was rack-and-pinion with power assist, providing precise and responsive handling.
Market Reception & Comparison
The GMC Sierra 1500 Denali with the 6.2-liter V8 received generally positive reviews from automotive critics. It was praised for its powerful engine, comfortable ride, and luxurious interior. Fuel economy, however, was a common criticism, as the 6.2-liter V8 consumed more fuel than the smaller 5.3-liter engine or the available diesel options. Reliability was generally good, although some owners reported issues with the electronic stability control system. Compared to the Chevrolet Silverado, which shared the same platform, the Sierra Denali offered a more upscale interior and exterior styling.
Legacy
The GMT900 Sierra 1500 Denali 6.2L remains a popular choice in the used truck market. The 6.2-liter Vortec V8 is known for its durability and relatively straightforward maintenance. While fuel economy isn’t exceptional by modern standards, the engine’s power and reliability continue to appeal to truck buyers. The Hydra-Matic 6L80 transmission has also proven to be a robust and reliable unit. These trucks are often sought after by those needing a capable and comfortable full-size pickup with a proven track record. Properly maintained examples can still provide many years of reliable service.
