Jeff Dunham’s Insane 750HP "Rat Rod" Humvee | Jay Leno's Garage

Fri, 27 Feb 2026 09:22:44 +0000

Jay Leno welcomes back his good friend and legendary comedian Jeff Dunham, who brings along arguably the most "practical" vehicle in his eclectic collection: a heavily modified 1987 AM General Humvee.

While this began life as a military-spec high mobility multipurpose wheeled vehicle (HMMWV), it has been transformed into a low-slung, 9,000-pound showstopper by the team at Patriot Liner. This "Humvee-Hummer" hybrid features a custom bomber-jacket leather interior, a veteran-owned "bed liner" paint finish, and a suspension that drops the entire chassis flat on the pavement.

In this episode, Jay and Jeff dive into:

The Powerplant: How a Duramax Turbo Diesel with compound turbos jumped from 350hp to a massive 750 horsepower.

Humvee vs. Hummer: Jeff explains the history of how Arnold Schwarzenegger helped transition these military beasts into civilian daily drivers.

Fly-by-Wire Steering: Jay tackles the bizarre experience of driving a vehicle with no mechanical steering column, where the wheel "straightens itself out" like an RC car.

The Build: A look at the 40-inch Mickey Thompson tires, the Allison transmission, and the massive custom components that make this beast surprisingly smooth to drive.

Military History: Jay and Jeff discuss the 600,000 miles of testing the AM General went through to beat out Chrysler and Teledyne for the original government contract.

Watch as Jay navigates this "uncontrolled" monster through the streets and finds out why Jeff used an H1 as his family's daily driver for over a decade.

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A new video every Monday! Visit Jay Leno's Garage, the Emmy-winning series where Jay Leno gives car reviews, motorcycle reviews, compares cars, and shares his passion and expertise on anything that rolls, explodes, and makes noise. Classic cars, restomods, super cars like the McLaren P1, sports cars like Porsche 918 Spyder and Camaro Z28, cafe racers, vintage cars, and much, much more.