The GMC Sierra 1500 III, specifically the Regular Cab Long Box configuration powered by the 4.8-liter Vortec V8 engine paired with an automatic transmission, was a mainstay of GMC’s full-size pickup truck lineup from 2007 to 2010. This variant represented a work-focused, value-oriented offering within the GMT900 platform, appealing to buyers prioritizing capability and affordability over luxury features. It served as a direct competitor to the Ford F-150, Chevrolet Silverado 1500, and Dodge Ram 1500 in the highly competitive North American full-size truck market.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Regular Cab Long Box |
| Type (Engine) | 4.8 Vortec V8 (295 Hp) Automatic |
| Start of production | 2007 |
| End of production | 2010 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 3 |
| Doors | 2 |
| Fuel consumption (urban) | 16.8 l/100 km (14 US mpg) |
| Fuel consumption (extra urban) | 12.4 l/100 km (19 US mpg) |
| Fuel Type | Petrol (Gasoline) |
| Power | 295 Hp @ 5600 rpm |
| Torque | 414 Nm @ 4600 rpm (305.35 lb.-ft. @ 4600 rpm) |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LY2 |
| Engine displacement | 4807 cm3 (293.34 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 96.01 mm (3.78 in.) |
| Piston Stroke | 83.06 mm (3.27 in.) |
| Compression ratio | 9.1:1 |
| 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 | 12.7 l (13.42 US qt | 11.17 UK qt) |
| Max. weight | 2903 kg (6400.02 lbs.) |
| Trunk (boot) space – maximum | 2138 l (75.5 cu. ft.) |
| Fuel tank capacity | 128 l (33.81 US gal | 28.16 UK gal) |
| Length | 5702 mm (224.49 in.) |
| Width including mirrors | 2031 mm (79.96 in.) |
| Height | 1867 mm (73.5 in.) |
| Wheelbase | 3378 mm (132.99 in.) |
| Front track | 1730 mm (68.11 in.) |
| Rear (Back) track | 1702 mm (67.01 in.) |
| Ride height (ground clearance) | 208 mm (8.19 in.) |
| Minimum turning circle (turning diameter) | 15.4 m (50.52 ft.) |
| Approach angle | 16° |
| Departure angle | 24.1° |
| Ramp-over (brakeover) angle | 21.5° |
| Drivetrain Architecture | Rear wheel drive |
| Drive wheel | 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
At the heart of this Sierra 1500 was the 4.8-liter (293 cubic inch) LY2 Vortec V8 engine. This engine, part of GM’s Vortec family, featured a cast iron block and aluminum cylinder heads. It utilized a 9.1:1 compression ratio and a multi-port fuel injection system to deliver a respectable 295 horsepower and 305 lb-ft of torque. The engine’s overhead valve (OHV) valvetrain, while traditional, proved durable and relatively simple to maintain. The automatic transmission was a 6-speed Hydra-Matic 4L80-E, known for its robustness and ability to handle the engine’s torque output. This transmission was a common choice for GM trucks and SUVs of the era.
Driving Characteristics
The 4.8L V8 and 6-speed automatic combination provided adequate, though not exhilarating, performance. Acceleration was sufficient for everyday driving and towing light to moderate loads. The automatic transmission was tuned for smooth shifts and fuel efficiency, prioritizing usability over sporty responsiveness. Compared to the available 5.3L V8 or the diesel options, the 4.8L felt less powerful, particularly when fully loaded or climbing hills. However, the 6-speed transmission helped to keep the engine in its optimal power band more effectively than older 4-speed automatics. The gear ratios were optimized for towing and hauling, providing good low-end torque.
Equipment & Trim Levels
The Regular Cab Long Box 4.8L Automatic Sierra 1500 typically served as the entry-level trim. Standard features generally included air conditioning, a basic AM/FM radio, vinyl upholstery, and manual windows and locks. Optional extras included power windows and locks, a CD player, upgraded audio systems, and towing packages. The interior was functional and durable, designed for work rather than luxury. The long bed provided ample cargo space, making it ideal for hauling building materials, equipment, or recreational gear.
Chassis & Braking
The Sierra 1500 utilized a body-on-frame construction, providing a robust and durable platform. The front suspension consisted of independent coil springs, while the rear suspension employed a traditional leaf spring setup. This configuration prioritized load-carrying capacity and durability over refined ride quality. Brakes were disc brakes in the front and drum brakes in the rear, equipped with an Anti-lock Braking System (ABS) as standard. The rear drum brakes were a cost-saving measure common on base model trucks. Steering was rack-and-pinion with power assist.
Market Reception & Comparison
The 4.8L Sierra 1500 was generally well-received as a capable and affordable work truck. Critics noted its strong engine, durable transmission, and ample cargo space. However, it was often criticized for its basic interior and lack of refinement compared to higher trim levels or competing trucks. Fuel economy was average for a full-size pickup, with EPA estimates around 14 mpg city and 19 mpg highway. Compared to the 5.3L V8, the 4.8L offered better fuel economy but significantly less power. The diesel options provided even better fuel economy and superior towing capacity, but at a higher initial cost.
Legacy
The LY2 4.8L Vortec V8, when paired with the 4L80-E transmission, has proven to be a relatively reliable powertrain. Common issues include oil leaks, particularly around the rear main seal, and occasional sensor failures. However, the engine is generally known for its longevity and durability. Today, these trucks are readily available on the used market at affordable prices, making them a popular choice for those seeking a capable and dependable work truck. While not as sought-after as the higher-performance trims, the 4.8L Sierra 1500 remains a viable option for buyers prioritizing practicality and value.
