2007-2010 GMC Sierra 1500 III (GMT900) Crew Cab Short Box 5.3 Vortec V8 (320 Hp) Automatic FlexFuel

Technical Specifications

The 2007-2010 GMC Sierra 1500 Crew Cab Short Box, equipped with the 5.3-liter Vortec V8 and automatic transmission, represented a compelling option for truck buyers seeking a balance of capability, comfort, and practicality. Part of the GMT900 series, this generation marked a significant step forward for GMC’s full-size pickup line, offering a more refined interior, improved ride quality, and enhanced safety features compared to its predecessors. The Crew Cab configuration, combined with the short bed, provided ample passenger space and reasonable cargo capacity, making it suitable for both work and family use. This particular variant occupied a mainstream position within the Sierra 1500 range, appealing to a broad spectrum of customers. The inclusion of FlexFuel capability further enhanced its versatility, allowing operation on gasoline or ethanol blends up to E85.

Powertrain & Engine Architecture

The powertrain of this Sierra 1500 centers around the 5.3-liter (325 cubic inch) Vortec LMG V8 engine. This engine is a member of the well-regarded Vortec family, known for its durability and straightforward design. It features a cast iron block paired with aluminum cylinder heads, contributing to a good balance of strength and weight. The engine utilizes a traditional overhead valve (OHV) valvetrain with two valves per cylinder, a design choice that prioritized simplicity and reliability. Fuel delivery is managed by a multi-port fuel injection system, ensuring precise fuel metering for optimal combustion and emissions control. The LMG engine generates 320 horsepower at 5200 rpm and 340 lb-ft of torque at 4200 rpm. The engine is mated to the Hydra-Matic 4L80-E four-speed automatic transmission, a robust and proven unit designed to handle the engine’s output and the truck’s towing demands. While lacking the sophistication of more modern transmissions with more gears, the 4L80-E is celebrated for its dependability. The FlexFuel system allows the engine to operate on gasoline, ethanol blends up to E85, or any mixture thereof, offering drivers flexibility at the fuel pump.

Driving Characteristics

Behind the wheel, the 5.3L V8 and 4L80-E automatic combination delivers a solid, if not exhilarating, driving experience. Acceleration is adequate for everyday driving and towing, but it doesn’t offer the briskness of the larger 6.0L V8 option. The four-speed automatic transmission, while reliable, lacks the close gear ratios found in newer transmissions, which can be noticeable during highway passing or when tackling steep inclines. The engine feels more responsive than the smaller 4.8L V8 available in other Sierra 1500 trims. The truck’s suspension is tuned for a comfortable ride, effectively absorbing bumps and road imperfections. However, the rear leaf spring suspension can feel somewhat firm when the truck is not carrying a load. Overall, the driving experience is geared towards practicality and comfort rather than sporty performance.

Equipment & Trim Levels

The standard equipment list for the Sierra 1500 Crew Cab Short Box 5.3L typically included air conditioning, power windows and locks, a CD player, and cloth upholstery. Stepping up to higher trim levels, such as the SLE and SLT, added features like leather upholstery, heated front seats, a premium sound system, and automatic climate control. A range of optional extras were also available, including a navigation system, a sunroof, and a rear-seat entertainment system. The interior design represented a significant improvement over the previous generation, featuring a more modern dashboard layout and higher-quality materials, contributing to a more refined cabin environment.

Chassis & Braking

The GMT900 Sierra 1500 utilizes a traditional body-on-frame construction, providing a strong and durable foundation. The front suspension employs an independent coil spring setup, while the rear suspension utilizes a conventional leaf spring configuration. This combination strikes a balance between ride comfort and load-carrying capability. Braking duties are handled by disc brakes at the front and drum brakes at the rear. Anti-lock brakes (ABS) were included as standard equipment, enhancing safety and control. The steering system is a rack-and-pinion design with power assist, providing responsive and precise steering feel.

Market Reception & Comparison

The 2007-2010 GMC Sierra 1500 generally received positive reviews from both automotive critics and consumers. The redesigned interior, improved ride quality, and overall capability were frequently praised. The 5.3L V8 and automatic transmission combination was considered a well-rounded choice, offering a good balance between power, fuel economy, and reliability. Compared to its corporate sibling, the Chevrolet Silverado, the Sierra offered a slightly more upscale interior and exterior styling. In comparison to the larger 6.0L V8, the 5.3L provided better fuel economy, making it a more practical option for buyers who didn’t frequently require maximum towing capacity. The Sierra also competed with offerings from Ford and Dodge, often being seen as a strong contender in terms of overall value and dependability.

Legacy

The GMT900 Sierra 1500, particularly the models equipped with the 5.3L V8 engine, have proven to be remarkably reliable vehicles over the long term. The Vortec 5.3L engine is known for its robust construction and durability, and the 4L80-E transmission is also a dependable unit. While some common issues, such as oil leaks, sensor failures, and occasional transmission problems, may arise with age, these are generally not major concerns. Today, these trucks are readily available on the used car market at affordable prices, making them a popular choice for buyers seeking a capable and dependable full-size pickup. Their continued presence on the road serves as a testament to their build quality and longevity, solidifying their place as a reliable workhorse for many years to come.