The GMC Sierra 1500 III, specifically the Crew Cab Short Box configuration with the 6.0-liter Vortec V8 engine and automatic transmission, represents a significant iteration in GMC’s full-size pickup truck lineage. Produced from 2007 through 2010 as part of the GMT900 platform generation, this variant aimed to balance robust capability with a degree of comfort and convenience appealing to both work and family needs. It occupied a mid-to-upper position within the Sierra 1500 lineup, offering more power and features than the base models but remaining below the more specialized heavy-duty trims.
Technical Specifications
| Brand | GMC |
| Model | Sierra 1500 |
| Generation | Sierra 1500 III (GMT900) Crew Cab Short Box |
| Type (Engine) | 6.0 Vortec V8 (367 Hp) Automatic |
| 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 (Gasoline) |
| Power | 367 Hp @ 5600 rpm |
| Torque | 508 Nm @ 4300 rpm (374.68 lb.-ft. @ 4300 rpm) |
| Maximum engine speed | 6000 rpm |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | L76 |
| Engine displacement | 5967 cm3 (364.13 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 101.6 mm (4 in.) |
| Piston Stroke | 91.95 mm (3.62 in.) |
| Compression ratio | 9.6:1 |
| 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 | 13.6 l (14.37 US qt | 11.97 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) |
| 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 | 6 gears, automatic transmission Hydra-Matic |
| Front suspension | Independent coil spring |
| Rear suspension | Rigid axle suspension, Leaf spring |
| Front brakes | Ventilated discs, 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 6.0-liter Vortec L76 V8 engine. This engine is a member of the Vortec family, known for its robust construction and relatively simple design. The L76 features a cast iron block with aluminum cylinder heads, a configuration that balances durability with weight reduction. It utilizes a 9.6:1 compression ratio and a multi-port fuel injection system, delivering a respectable 367 horsepower at 5600 rpm and 508 Nm (374.68 lb-ft) of torque at 4300 rpm. The engine’s overhead valve (OHV) valvetrain, while not as technologically advanced as overhead cam designs, contributes to its reliability and ease of maintenance. The Hydra-Matic 6-speed automatic transmission was the standard pairing for this engine. This transmission offered smooth shifts and helped optimize fuel economy for a vehicle of this size. The gear ratios were tuned to provide a balance between acceleration and towing capability.
Driving Characteristics
The 6.0L V8 and 6-speed automatic combination provided a noticeable step up in performance compared to the base 4.8L or 5.3L engine options. Acceleration was brisk, and the truck felt capable when hauling moderate loads or towing trailers. However, it wasn’t a performance-oriented truck; the focus remained on usability and dependability. The automatic transmission, while smooth, wasn’t particularly quick to downshift, and the overall driving experience was more about relaxed cruising than sporty handling. Compared to manual transmission versions, the automatic offered convenience but sacrificed some driver control and potentially a slight amount of fuel efficiency.
Equipment & Trim Levels
The Crew Cab Short Box 6.0L trim typically included features such as 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 seats, a Bose sound system, heated front seats, and automatic climate control. Optional extras included a navigation system, a sunroof, and a rear-seat entertainment system. The Crew Cab configuration provided ample space for passengers, making it a popular choice for families.
Chassis & Braking
The GMT900 platform utilized a body-on-frame construction, providing a solid and durable foundation. The front suspension consisted of independent coil springs, while the rear suspension employed a traditional leaf spring setup. This configuration was designed to handle heavy loads and provide a comfortable ride. Braking duties were handled by ventilated discs at the front and drum brakes at the rear. An anti-lock braking system (ABS) was standard. The truck’s relatively high ground clearance (229 mm / 9.02 in.) allowed for moderate off-road capability.
Market Reception & Comparison
The 6.0L Sierra 1500 was generally well-received by critics and consumers alike. It offered a compelling combination of power, space, and features. Fuel economy, however, was a common criticism, with the 6.0L V8 consuming significantly more fuel than the smaller engine options. Compared to competitors like the Ford F-150 and Chevrolet Silverado, the Sierra 1500 offered a similar level of capability and refinement. The GMC brand often positioned itself as a more premium offering than Chevrolet, with slightly more upscale interiors and features.
Legacy
The GMT900 Sierra 1500, particularly the 6.0L V8 variant, has proven to be a relatively reliable truck in the used car market. The Vortec engine is known for its durability, and the Hydra-Matic transmission is generally dependable when properly maintained. However, potential buyers should be aware of common issues such as oil leaks and sensor failures. Today, these trucks represent a good value for those seeking a capable and spacious full-size pickup at a reasonable price. They remain popular among those who need a workhorse vehicle without the complexity and cost of newer models.
