The GMC Sierra 1500 III, specifically the Regular Cab Long Box configuration with the 4.8-liter Vortec V8 engine and four-wheel drive, was a mainstay of GMC’s full-size pickup truck lineup from 2007 to 2010. This variant represented a work-focused offering within the GMT900 platform, appealing to buyers prioritizing capability and value over luxury features. It occupied a position below the more powerful 5.3L and 6.0L V8 options, and above any potential four-cylinder base models, making it a popular choice for those needing a robust truck without the higher price tag of the premium trims.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Regular Cab Long Box |
| Type (Engine) | 4.8 Vortec V8 (295 Hp) 4WD 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, 16.8 UK mpg) |
| Fuel consumption (extra urban) | 13.1 l/100 km (18 US mpg, 21.6 UK 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 | 1875 mm (73.82 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) | 241 mm (9.49 in.) |
| Minimum turning circle | 15.4 m (50.52 ft.) |
| Approach angle | 17° |
| Departure angle | 23.3° |
| Ramp-over angle | 21.8° |
| 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 | 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 was the 4.8L 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 Hydra-Matic 4L80-E four-speed automatic transmission was the sole transmission option for this configuration. This transmission was known for its robustness and ability to handle the engine’s torque, but it lacked the fuel efficiency of more modern transmissions with higher gear counts.
Driving Characteristics
The 4.8L V8 and 4L80-E automatic combination provided adequate, though not exhilarating, performance. Acceleration was sufficient for everyday driving and towing moderate loads. The four-speed automatic, while reliable, meant the engine often ran at higher RPMs during highway cruising, impacting fuel economy. Compared to the 5.3L V8, the 4.8L offered less power and a slightly slower 0-60 mph time. However, it provided a noticeable improvement in fuel economy. The 4WD system offered enhanced traction in inclement weather and off-road conditions, making it a versatile choice for those living in areas with challenging terrain.
Equipment & Trim Levels
The Regular Cab Long Box 4.8L 4WD Sierra 1500 typically came with a basic, yet functional, set of features. Standard equipment included air conditioning, a basic audio system, and vinyl upholstery. Power windows and locks were often optional. The interior was designed with durability in mind, featuring hard-wearing plastics and a straightforward layout. Optional extras included upgraded audio systems, cruise control, and a towing package. The trim level generally fell into the base or mid-range category, prioritizing functionality over luxury.
Chassis & Braking
The Sierra 1500’s chassis was a traditional body-on-frame construction, providing a robust and durable platform. The front suspension utilized independent coil springs, while the rear employed a rigid axle suspension with leaf springs. This setup prioritized load-carrying capacity and durability over refined ride quality. Braking duties were handled by disc brakes up front and drum brakes in the rear. Anti-lock brakes (ABS) were standard, enhancing safety during emergency braking situations. The rear drum brakes were a cost-saving measure common in this class of truck.
Market Reception & Comparison
The 4.8L Sierra 1500 was generally well-received as a capable and affordable work truck. Critics noted its strong engine for its size, but also pointed out the lack of refinement compared to some competitors. Fuel economy was considered average for a full-size pickup truck of its era. Compared to the 5.3L V8 Sierra, the 4.8L offered a lower purchase price and slightly better fuel economy, but at the expense of performance. The 4.8L was often favored by fleet buyers and individuals who prioritized value and reliability over outright power.
Legacy
The LY2 4.8L Vortec V8, when paired with the 4L80-E transmission, has proven to be a relatively reliable powertrain. While not without its potential issues (such as oil leaks and occasional transmission problems), these engines are generally known for their longevity when properly maintained. Today, these trucks are readily available on the used car market at affordable prices. They remain popular choices for those seeking a capable and dependable work truck, though potential buyers should be aware of the age-related maintenance that may be required. The simplicity of the engine and transmission makes it relatively easy and inexpensive to repair, contributing to its continued appeal.
