The GMC Sierra 1500 III, specifically the Crew Cab Short Box configuration with the 5.3 Vortec V8 engine and 6-speed automatic transmission, was produced from 2007 to 2010. This variant represented a significant offering within the GMT900 platform, GMC’s full-size pickup truck line. Positioned as a versatile and capable workhorse, it catered to buyers needing both passenger space and substantial towing/hauling capacity. The FlexFuel capability added further appeal, allowing operation on gasoline or ethanol blends up to E85. This model year marked a substantial redesign for the Sierra, focusing on improved interior refinement and enhanced mechanical components compared to its predecessors.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Crew Cab Short Box |
| Type (Engine) | 5.3 Vortec V8 (315 Hp) 6 Automatic FlexFuel |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 6 |
| Doors | 4 |
| Fuel consumption (urban) | 16.8 l/100 km (14 US mpg, 16.8 UK mpg) |
| Fuel consumption (extra urban) | 11.8 l/100 km (19.9 US mpg, 23.9 UK mpg) |
| Fuel Type | Petrol / Ethanol – E85 |
| Power | 315 Hp @ 5200 rpm |
| Power per litre | 59.1 Hp/l |
| Torque | 458 Nm @ 4400 rpm (337.8 lb.-ft. @ 4400 rpm) |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LC9 |
| Engine displacement | 5328 cm3 (325.13 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 96.01 mm (3.78 in.) |
| Piston Stroke | 91.95 mm (3.62 in.) |
| Compression ratio | 9.9:1 |
| 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 | 14.1 l (14.9 US qt | 12.41 UK qt) |
| Max. weight | 3084 kg (6799.06 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%) | 4354 kg (9598.93 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.) |
| Front track | 1730 mm (68.11 in.) |
| Rear (Back) track | 1702 mm (67.01 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 | 22.8° |
| Ramp-over (brakeover) angle | 19.3° |
| Drivetrain Architecture | Rear wheel drive |
| 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 | Disc, 330×30 mm |
| Rear brakes | Drum, 295×60 mm |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Power steering | Electric Steering |
| Tires size | 245/70 R17 |
| Wheel rims size | 7.5J x 17 |
Powertrain & Engine Architecture
The heart of this Sierra 1500 variant is the 5.3-liter (325.13 cubic inch) LC9 Vortec V8 engine. This engine is a member of the Vortec family, known for its robust construction and relatively simple design. It features a cast iron block with aluminum cylinder heads, and utilizes a 9.9:1 compression ratio. The LC9 employs a traditional overhead valve (OHV) valvetrain with two valves per cylinder. Fuel delivery is managed by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The FlexFuel capability allows the engine to run on gasoline, ethanol blends, or pure E85 fuel, offering versatility and potentially reducing emissions. The engine is mated to a 6-speed Hydra-Matic automatic transmission, providing smooth and efficient gear changes. This transmission was a significant upgrade from the previous 4-speed automatic, offering improved fuel economy and enhanced performance.
Driving Characteristics
The 5.3L V8 with the 6-speed automatic delivers a balance of power and usability. While not as quick as the available 6.0L V8, the 5.3L provides ample torque for everyday driving and towing. The 6-speed transmission helps keep the engine in its optimal power band, resulting in responsive acceleration. The automatic transmission’s gear ratios are tuned for both fuel efficiency and towing capability. In real-world conditions, this setup offers a comfortable and capable driving experience. Compared to manual transmission versions, the automatic provides ease of use, particularly in stop-and-go traffic. However, it may sacrifice some fuel economy and driver engagement. The rear-wheel-drive configuration provides a traditional truck feel, with good traction in most conditions.
Equipment & Trim Levels
The Crew Cab Short Box 5.3L Automatic Sierra 1500 typically came standard with features like air conditioning, power windows and locks, a CD player with an auxiliary input, and cloth upholstery. Higher trim levels, such as the SLT, added features like leather upholstery, heated seats, a premium sound system, and automatic climate control. Optional extras included a navigation system, a sunroof, and a rear-seat entertainment system. The Crew Cab configuration offered spacious seating for up to six passengers, making it a popular choice for families. The short bed provided a good balance between cargo capacity and maneuverability.
Chassis & Braking
The GMT900 platform utilizes a fully boxed frame for enhanced rigidity and durability. The front suspension features independent coil springs, providing a comfortable ride and good handling. The rear suspension employs a traditional leaf spring setup, which is well-suited for hauling and towing. Braking duties are handled by disc brakes in the front and drum brakes in the rear. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The steering system is a rack-and-pinion setup with electric power steering, providing precise and responsive steering feel.
Market Reception & Comparison
The 2007-2010 GMC Sierra 1500 with the 5.3L V8 and 6-speed automatic was generally well-received by critics and consumers. It was praised for its comfortable ride, spacious interior, and capable powertrain. Fuel economy was considered average for a full-size pickup truck, with the FlexFuel capability offering a potential cost savings. Compared to the 4.8L V8 version, the 5.3L offered significantly more power and towing capacity. The 6.0L V8 provided even more performance, but at a higher price point. Reliability was generally good, although some owners reported issues with the active fuel management system, which deactivated cylinders to improve fuel economy.
Legacy
The LC9 5.3L Vortec V8 and 6-speed automatic transmission proved to be a durable and reliable combination. These powertrains are still commonly found in used Sierra 1500s today. While not the most fuel-efficient option, the 5.3L V8 offers a good balance of power, reliability, and affordability. The GMT900 platform itself is known for its robust construction and longevity. The 2007-2010 Sierra 1500 remains a popular choice for buyers seeking a capable and dependable full-size pickup truck.
