AM General M939 5-Ton Cargo Truck

Engine & Performance

Engine: Cummins NHC-250 inline-6 naturally aspirated diesel, 14.0 liters (855 cubic inches), producing 240 horsepower and 685 lb-ft of torque

Transmission & Drivetrain: Allison MT654CR 5-speed automatic transmission with 2-speed transfer case and 6x6 drivetrain

Performance: 0-60 mph in approximately 30+ seconds, top speed limited to around 55-60 mph, curb weight around 21,000 lbs, with massive load-carrying and towing capacity

Exterior

Olive drab and camouflage military green paint with a custom painted shark mouth motif on the front fender, large heavy-duty off-road tires with deep treads, flat-panel windshield, bumper labeled WATHOG, and a covered cargo bed in the rear

Interior Features

Spartan military cabin featuring bare metal surfaces, basic instrumentation, dual bucket seats, large steering wheel, and heavy-duty mechanical controls built for durability rather than comfort

Condition Assessment

Good, showing standard military surplus wear, custom custom artwork on the body, and solid operational rolling gear

Condition Issues: Minor paint fading, surface wear consistent with heavy-duty service and surplus storage, custom shark mouth graphics applied

Estimated Mileage: 20,000 - 50,000 miles (typical for surplus military vehicles)

Historical Significance

The M939 series is the successor to the Vietnam-era M39 and M809 5-ton trucks, serving as the backbone medium-heavy tactical truck for the United States Armed Forces through numerous conflicts from the 1980s onward

Notable Features

Central Tire Inflation System (CTIS) on later variants, massive 11.00R20 dual rear tires, distinctive US Marine Corps eagle, globe, and anchor emblem visible on the door, and custom WATHOG bumper lettering

Production Numbers

Over 30,000 units produced across all variants (M923, M925, M929, etc.) by AM General and BMY

Maintenance Recommendations

Regular checks of pneumatic brake systems, fluid changes for heavy-duty differentials and transfer case, battery maintenance for 24-volt electrical systems, and sourcing surplus replacement parts

Fun Facts

1. The Cummins NHC-250 diesel engine is famously multi-fuel capable, meaning it can run on diesel, kerosene, jet fuel, or even heating oil in emergency situations. 2. Many of these trucks are sold to the public through government surplus auctions once retired from active duty. 3. Their imposing size makes them a favorite base vehicle for extreme civilian off-road modifications and custom overland RV builds.

Identified on: 10/12/2026