The GMC Sierra 1500 III, specifically the Crew Cab Short Box configuration with the 5.3-liter Vortec V8 engine and four-speed automatic transmission, represents a significant iteration in GMC’s full-size pickup truck lineage. Produced from 2007 through 2010 (GMT900 platform), this variant aimed to balance capability, comfort, and fuel efficiency within the highly competitive American truck market. Positioned as a mid-range offering within the Sierra 1500 lineup, it slotted between the base models with smaller engines and the more powerful 6.0-liter V8 options, appealing to buyers needing substantial towing and hauling capacity without the premium price tag of the top-tier trims.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Crew Cab Short Box |
| Type (Engine) | 5.3 Vortec V8 (315 Hp) 4 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) | 12.4 l/100 km (19 US mpg, 22.8 UK mpg) |
| Fuel Type | Petrol / Ethanol – E85 |
| Weight-to-power ratio | 7.4 kg/Hp, 134.7 Hp/tonne |
| Weight-to-torque ratio | 5.1 kg/Nm, 195.9 Nm/tonne |
| 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) |
| Kerb Weight | 2338 kg (5154.41 lbs.) |
| Max. weight | 3084 kg (6799.06 lbs.) |
| Max load | 746 kg (1644.65 lbs.) |
| Trunk (boot) space – maximum | 1506 l (53.18 cu. ft.) |
| Fuel tank capacity | 98 l (25.89 US gal | 21.56 UK gal) |
| 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 |
| Drive wheel | Rear wheel drive |
| 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
At the heart of this Sierra 1500 variant lies the 5.3-liter (325 cubic inch) LC9 Vortec V8 engine. This engine is a member of the Vortec family, known for its robust construction and relatively simple design. The LC9 features a cast iron block with aluminum cylinder heads, a configuration that balances durability and weight. It utilizes a 9.9:1 compression ratio and a two-valve-per-cylinder overhead valve (OHV) valvetrain. Fuel delivery is managed by a multi-port fuel injection system, providing adequate atomization for efficient combustion. The engine is also FlexFuel capable, meaning it can operate on gasoline or a blend of up to 85% ethanol (E85). Paired with the engine is the 4L60E four-speed automatic transmission, a Hydra-Matic design known for its reliability and smooth shifting, though it lacks the efficiency of more modern transmissions with higher gear counts. The transmission was calibrated to provide adequate torque multiplication for towing and hauling, but at the expense of optimal fuel economy at highway speeds.
Driving Characteristics
The 5.3L V8 with the 4L60E automatic delivers a respectable, if not exhilarating, driving experience. With 315 horsepower and 337.8 lb-ft of torque, the truck offers sufficient power for everyday driving and moderate towing duties. Acceleration is adequate, but the four-speed transmission limits engine RPMs, particularly when merging onto highways or climbing hills. Compared to the 6.0L V8 models, this variant feels noticeably less powerful, especially when fully loaded. However, it offers a smoother and more relaxed driving experience than the base 4.8L V8. The automatic transmission’s gear ratios are optimized for low-end torque, making it suitable for work applications, but it can feel somewhat “busy” at higher speeds. The rear-wheel-drive configuration provides a traditional truck feel, with predictable handling and good traction in dry conditions.
Equipment & Trim Levels
The Crew Cab Short Box 5.3L Automatic typically came standard with features like air conditioning, power windows and locks, a CD player, and cloth upholstery. The Crew Cab configuration offered spacious seating for up to six passengers, making it a popular choice for families. Optional extras included leather upholstery, a premium sound system, a navigation system, and a power sunroof. Trim levels varied, with the SLE and SLT trims offering progressively more features and luxury appointments. The SLT trim, in particular, added features like heated seats, automatic climate control, and chrome exterior accents.
Chassis & Braking
The GMT900 platform utilizes a body-on-frame construction, providing a robust and durable chassis. The front suspension consists of independent coil springs, while the rear suspension employs a traditional leaf spring setup. This configuration prioritizes load-carrying capacity and durability over refined ride quality. Braking duties are handled by disc brakes up front and drum brakes in the rear. An Anti-lock Braking System (ABS) is standard, enhancing safety and control during emergency braking situations. The truck’s relatively high ground clearance (9.02 inches) allows for moderate off-road capability.
Market Reception & Comparison
The GMC Sierra 1500 III with the 5.3L V8 and 4-speed automatic was generally well-received by critics and consumers alike. It was praised for its comfortable ride, spacious interior, and capable powertrain. However, the four-speed transmission was often criticized for its lack of efficiency compared to newer transmissions. Fuel economy figures of 14 mpg city and 19 mpg highway were typical for this configuration. Compared to the 4.8L V8 models, the 5.3L offered a significant performance upgrade, while remaining more affordable than the 6.0L V8 options. Reliability was generally good, although some owners reported issues with the automatic transmission over the long term.
Legacy
The GMT900 Sierra 1500, and specifically the 5.3L V8/4-speed automatic combination, remains a relatively common sight on used car lots today. The LC9 engine is known for its durability and longevity, provided it has been properly maintained. While the four-speed transmission is aging, it is generally reliable and relatively inexpensive to repair. These trucks offer a good value for buyers seeking a capable and affordable full-size pickup. However, potential buyers should be aware of potential issues with rust, particularly in areas with harsh winters. The 5.3L Vortec remains a popular engine for modifications and upgrades, making these trucks a versatile platform for enthusiasts.
