2004-2007 Hummer H2 (gmt 840) 6.0i V8 (329 Hp)

The Hummer H2, produced from 2004 to 2007, represented a significant downsize from the original Hummer H1, aiming to bring the Hummer brand’s rugged image and off-road capability to a wider audience. Built on General Motors’ GMT840 platform – shared with the Chevrolet Tahoe and GMC Yukon – the H2 was positioned as a luxury SUV with substantial off-road prowess. The 6.0i V8 variant, producing 329 horsepower, was the sole engine option offered throughout its production run, but was paired with either a 4-speed automatic transmission or a 5-speed manual. This article focuses specifically on the 6.0i V8 model equipped with the 4-speed automatic transmission, detailing its specifications, performance, and place within the H2 lineup.

Technical Specifications

INTRODUCTION

The Hummer H2 with the 6.0L V8 and 4-speed automatic transmission was the standard configuration for the majority of the H2’s production run. Introduced in 2004, it aimed to provide a balance between the H2’s imposing presence and a more accessible price point compared to the fully-equipped models. Positioned as the entry-level offering, it still delivered a substantial amount of power and capability, making it a popular choice for those seeking a large, capable SUV with a distinctive style. The H2 was built on the GMT840 platform, a truck-based chassis that provided a robust foundation for both on-road comfort and off-road performance.

Powertrain & Engine Architecture

At the heart of the H2 6.0i Automatic lies the LQ4 6.0-liter (5967 cc) V8 engine. This engine, a member of GM’s Vortec family, is a cast-iron block, aluminum-head design. It utilizes a traditional overhead valve (OHV) valvetrain with two valves per cylinder. Fuel delivery is managed by a multi-port fuel injection system, providing precise fuel metering for optimal combustion. The engine produces 329 horsepower at 5200 rpm and 494 Nm (364.36 lb-ft) of torque at 4000 rpm. The 4L60-E four-speed automatic transmission was the standard pairing for this engine. This transmission is known for its durability, but its relatively limited number of gears compared to modern transmissions can impact fuel economy and refinement. The transmission features electronic control for smoother shifting and adaptive shift patterns.

Driving Characteristics

The H2 6.0i Automatic offered a compelling driving experience, albeit one heavily influenced by its size and weight. The 6.0L V8 provided ample power for everyday driving and towing, with the automatic transmission delivering smooth, if not particularly quick, gear changes. Compared to the 5-speed manual version, the automatic offered greater convenience, especially in urban environments. However, the manual transmission provided more driver control and slightly improved fuel economy. The 4-speed automatic’s gear ratios were geared more towards torque delivery than outright acceleration. While capable of reaching a top speed of 98.18 mph, the H2 felt most comfortable cruising at highway speeds, where the engine’s torque reserve provided effortless passing power. The H2’s substantial weight (2901 kg / 6395.61 lbs) was noticeable during braking and cornering, but the robust suspension system helped to mitigate body roll.

Equipment & Trim Levels

The base H2 6.0i Automatic came standard with a respectable array of features, including air conditioning, power windows and locks, a premium sound system, and alloy wheels. Interior upholstery was typically cloth, though leather was available as an option. Optional extras included a sunroof, heated seats, a navigation system, and upgraded audio components. The H2’s interior design was functional and relatively luxurious for its time, with a focus on durability and ease of use. The dashboard layout was straightforward, with clearly labeled controls and a large center console.

Chassis & Braking

The H2’s chassis was built around a body-on-frame construction, providing a solid and durable platform. Front suspension utilized a torsion bar setup, while the rear featured coil springs. This configuration offered a good balance between ride comfort and off-road capability. Braking duties were handled by ventilated discs on all four wheels, coupled with an Anti-lock Braking System (ABS) for enhanced safety. The H2’s large tires (315/70 R17) provided excellent traction on a variety of surfaces. The H2’s high ground clearance (255 mm / 10.04 in.) and impressive approach, departure, and breakover angles made it a capable off-road vehicle.

Market Reception & Comparison

The Hummer H2 was generally well-received by the market, particularly among buyers seeking a large, imposing SUV with off-road capability. Critics praised its powerful engine, comfortable ride, and distinctive styling. However, the H2 was also criticized for its poor fuel economy, large size, and relatively high price. Compared to other SUVs in its class, such as the Chevrolet Tahoe and GMC Yukon, the H2 offered a more aggressive and distinctive design, as well as superior off-road capability. However, it also lagged behind in terms of fuel efficiency and interior space. The automatic transmission was often seen as a compromise, offering convenience at the expense of performance and fuel economy compared to the manual option.

Legacy

The Hummer H2, particularly the 6.0i V8 Automatic variant, has developed a cult following among enthusiasts. While the brand itself is defunct, the H2 remains a popular choice in the used car market, prized for its ruggedness, distinctive styling, and powerful engine. The LQ4 6.0L V8 engine is known for its reliability and durability, making it a relatively low-maintenance powertrain. However, potential buyers should be aware of the H2’s poor fuel economy and the potential for costly repairs due to its age and complexity. Despite its shortcomings, the H2 6.0i Automatic remains a significant vehicle in the history of American SUVs, representing a bold and unapologetic statement of style and capability.