U.S. HUMVEE Targets Tougher Terrain With New 250 HP Engine and Upgraded Suspension From AM General.

U.S. defense manufacturer AM General is introducing a redesigned HUMVEE with a more powerful engine, upgraded transmission, and long-travel suspension to improve off-road mobility and performance across difficult terrain. The modernization aims to extend the capabilities of the widely used light tactical vehicle, with the first production phase planned for late 2027 and further upgrades expected to introduce digital and autonomous capabilities.

AM General's redesigned HUMVEE is on display at AUSA 2026 in Washington, D.C., featuring an upgraded powertrain and suspension designed to improve off-road mobility and performance across difficult terrain. (Picture source: Army Recognition)

The new configuration brings changes to the vehicle's mechanical systems while preserving its role as a multipurpose light tactical vehicle. Rather than replacing the existing design entirely, AM General is developing a three-phase modernization program that combines improved automotive performance with future digital systems and autonomous capabilities.

AM General will present the upgraded HUMVEE at the Association of the U.S. Army (AUSA) Annual Meeting in Washington, held October 12 to 14, 2026. The manufacturer's presentation details changes to the powertrain, suspension, and vehicle architecture, identifying the modernization as part of its continuing development of military mobility solutions for the U.S. Army and other customers.

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At the center of the redesign is a 6.5-liter diesel engine incorporating Common Rail Direct Injection (CRDI) technology. The engine develops 250 horsepower and more than 500 pound-feet of torque, equivalent to approximately 678 Nm, providing additional power for acceleration and movement under load. Common-rail injection allows electronically controlled fuel delivery, supporting more precise combustion management and improved efficiency. The engine is also designed to operate with different military fuels, including JP-8 and F-24, as well as conventional diesel.

Power is transmitted through a six-speed Allison automatic gearbox with wide-ratio gearing to improve acceleration and maintain suitable engine performance across operating conditions. The transmission incorporates FuelSense 2.0 technology, which AM General credits with improving fuel economy by approximately 6%. An electronic range selector also simplifies adaptation between left-hand-drive and right-hand-drive configurations, supporting the use of a common powertrain across several military vehicle applications.

The suspension receives particular attention in the first modernization phase. AM General is introducing a long-travel design intended to help the vehicle negotiate uneven ground while maintaining better control over wheel movement. Greater suspension travel allows the wheels to follow changes in terrain more effectively, particularly when operating over rough surfaces. The vehicle also receives a redesigned hood and front grille to accommodate the new powertrain, improve airflow and cooling, and support increased payload capacity.

The HUMVEE's advertised mobility characteristics provide further context for these improvements. AM General lists the ability to negotiate gradients of up to 60% and side slopes of 40%, with ground clearance reaching 16 inches, approximately 406 mm. The vehicle can also ford water obstacles up to 30 inches, or 762 mm, deep, increasing to 60 inches, approximately 1.52 meters, when equipped with an additional fording kit. These figures represent manufacturer-stated capabilities rather than independently verified performance results for the complete upgraded configuration.

Such characteristics have direct implications for tactical mobility. Light military vehicles frequently operate on unprepared roads, rocky tracks and uneven ground, where maintaining traction and controlling vehicle movement can be as important as engine output. Increased torque can assist crews when climbing steep gradients or moving with additional equipment, while improved suspension performance can reduce repeated shocks affecting occupants and onboard systems. During reconnaissance, patrol, liaison and logistical support missions, the combination of ground clearance, obstacle-crossing ability and improved propulsion can help maintain movement beyond established road networks, particularly where terrain restricts access for larger military vehicles.

The redesign also forms part of a broader industrial strategy. AM General intends to use the same powertrain in its AMG unmanned ground vehicle and HUMVEE Hawkeye 105 mm mobile artillery system. Sharing mechanical components between different vehicle families could simplify maintenance arrangements, spare parts management and technical support. It also creates opportunities to apply future improvements across several systems without developing separate propulsion solutions for each vehicle.

The second and third modernization phases will extend beyond automotive performance. Planned developments include improved crew ergonomics, a digital cockpit, updated vehicle electronics, and eventually autonomous or optionally manned operation. These capabilities would require deeper integration between vehicle controls, onboard computing systems, and mission equipment. AM General has not announced a firm production schedule for these later phases, leaving their implementation separate from the initial configuration planned for 2027.

For the United States and allied armed forces, the renewed HUMVEE reflects the continuing challenge of balancing new vehicle procurement with the modernization of existing military equipment. NATO countries face pressure to sustain fleet availability, standardize logistical support, and prepare their forces for operations across increasingly contested environments. A more capable HUMVEE could offer another option for armies seeking to retain light tactical mobility while preparing for the integration of autonomous systems. Its eventual contribution to military readiness will depend on procurement decisions, production capacity, and whether the announced improvements translate into measurable advantages under operational conditions.

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Written By Erwan Halna du Fretay - Defense Analyst, Army Recognition Group
Erwan Halna du Fretay holds a Master’s degree in International Relations and has experience studying conflicts and global arms transfers. His research interests include security and strategic studies, particularly the dynamics of the defense industry, the evolution of military technologies, and the strategic transformation of armed forces.