The GMC Sierra 1500 III, specifically the Crew Cab Short Box configuration with the 4.8-liter Vortec V8 engine, 4WD, and automatic transmission, was produced from 2010 to 2013. This variant represented a popular choice within the GMT900 generation Sierra lineup, offering a balance between capability, comfort, and affordability. Positioned as a mid-range offering, it catered to buyers needing a full-size pickup with passenger space and the versatility of four-wheel drive, without the higher price tag of the larger displacement engines or premium trim levels. The FlexFuel capability added further appeal, allowing operation on gasoline or ethanol blends up to E85.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Crew Cab Short Box |
| Type (Engine) | 4.8 Vortec V8 (302 Hp) 4WD Automatic FlexFuel |
| Start of production | 2010 |
| End of production | 2013 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Pick-up |
| Seats | 6 |
| Doors | 4 |
| Fuel consumption (urban) | 18.1 l/100 km (13 US mpg) |
| Fuel consumption (extra urban) | 13.1 l/100 km (18 US mpg) |
| Fuel Type | Petrol / Ethanol – E85 |
| Power | 302 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 | L20 |
| 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 | 8.8:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| 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 | 3311 kg (7299.51 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%) | 4309 kg (9499.72 lbs.) |
| Length | 5844 mm (230.08 in.) |
| Width including mirrors | 2031 mm (79.96 in.) |
| Height | 1880 mm (74.02 in.) |
| Wheelbase | 3645 mm (143.5 in.) |
| Front track | 1732 mm (68.19 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 | 15.5° |
| Departure angle | 23.1° |
| Ramp-over (brakeover) angle | 19.6° |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the rear wheels permanently, and the front wheels are driven through an electrically or mechanically operated clutch if necessary. |
| Drive wheel | All wheel drive (4×4) |
| Number of gears and type of gearbox | 4 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 4.8L (293 cubic inch) Vortec 4800 V8 engine, designated as the L20. This engine is a member of the Vortec family, known for its robust design and relatively simple architecture. It features a cast iron block with aluminum cylinder heads, and utilizes a 90-degree V8 configuration. The engine employs a multi-port fuel injection system, delivering fuel directly to each cylinder intake port. The valvetrain is a traditional overhead valve (OHV) design with two valves per cylinder. The 4.8L Vortec produces 302 horsepower at 5600 rpm and 305 lb-ft of torque at 4600 rpm. The engine’s FlexFuel capability allows it to run on gasoline or a blend of up to 85% ethanol (E85). The engine is mated to a four-speed Hydra-Matic automatic transmission, a common and reliable unit for GM trucks of this era.
Driving Characteristics
The 4.8L V8 and four-speed automatic combination provided adequate, though not exhilarating, performance for the Sierra 1500. Acceleration was sufficient for everyday driving and towing moderate loads. Compared to the available 5.3L and 6.2L V8 options, the 4.8L offered less raw power, resulting in slower acceleration times and a reduced towing capacity. However, the 4.8L’s smaller displacement contributed to slightly better fuel economy. The four-speed automatic transmission, while reliable, lacked the refinement and efficiency of newer transmissions with more gears. Gear ratios were optimized for towing and hauling, rather than sporty driving. The 4WD system provided enhanced traction in inclement weather and off-road conditions, making it a practical choice for those living in areas with snow or rough terrain.
Equipment & Trim Levels
The Crew Cab Short Box 4.8L 4WD Sierra 1500 typically came standard with features like air conditioning, power windows and locks, a basic audio system, and cloth upholstery. The Crew Cab configuration offered spacious seating for up to six passengers, making it a comfortable option for families. Optional extras included upgraded audio systems, leather upholstery, power-adjustable seats, a navigation system, and various convenience packages. Trim levels varied, but generally included base models and slightly more equipped SLE and SLT trims. The SLE trim added features like chrome exterior accents and upgraded interior materials, while the SLT offered premium features like leather seats and a Bose audio system.
Chassis & Braking
The GMT900 Sierra 1500 featured a body-on-frame construction, providing a robust and durable platform. The front suspension utilized an independent coil spring design, offering a comfortable ride. The rear suspension employed a traditional leaf spring setup, optimized for load-carrying capacity. Braking duties were handled by disc brakes at the front and drum brakes at the rear. An Anti-lock Braking System (ABS) was standard, enhancing safety and control during emergency braking situations. The truck’s relatively high ground clearance (9.02 inches) allowed for moderate off-road capability. Steering was rack-and-pinion with power assist, providing responsive and precise handling.
Market Reception & Comparison
The 4.8L Sierra 1500 was generally well-received by critics and consumers as a capable and affordable full-size pickup. While not as powerful as its larger-engined siblings, it offered a good balance of performance, fuel economy, and value. Fuel economy figures averaged around 13-18 mpg in real-world driving, depending on driving conditions and load. Compared to the 5.3L V8, the 4.8L offered slightly better fuel economy but significantly less towing capacity. Reliability was generally good, with the 4.8L Vortec engine proving to be a durable and long-lasting powerplant. However, some owners reported issues with the automatic transmission over time.
Legacy
The GMT900 Sierra 1500, and specifically the 4.8L V8 variant, remains a popular choice in the used truck market. The 4.8L engine is known for its reliability and relatively low maintenance costs. Parts availability is excellent, and the truck’s simple design makes it relatively easy to repair. While not the most powerful or luxurious option, the 4.8L Sierra 1500 offers a practical and affordable solution for those needing a capable full-size pickup. Its enduring popularity is a testament to its robust construction and proven powertrain.
