Find a trail through the archive.

The civilian line carried the wartime layout into farms, trails, and recreation, then evolved into the direct ancestor of Wrangler.

Roos transformed an unimpressive Willys four-cylinder into the 60-hp Go Devil, the mechanical advantage that helped Willys win the standardized contract.

One design, two makers, a synthesis nobody built alone

Go Devil, Hurricane, Dauntless, AMC inline-sixes, Hemi and Hellcat V8s, and the modern Hurricane inline-six map alliances, acquisitions, and changing vehicle missions.

Bantam, Willys, and Ford made different indispensable contributions. Later corporate retellings often blur procurement, design, production, and trademark ownership into one claim.

Same displacement as the Go Devil, but an F-head redesign lifted output roughly 25%. Its one famous consequence: the taller F134 would not fit under the CJ-3A hood, so in 1953 Willys raised the hood and grille to clear it — creating the CJ-3B's distinctive tall-hood silhouette, the shape Mitsubishi, Mahindra, VIASA and Hotchkiss then built under licence for decades. A single engine's height reshaped the Jeep's face worldwide.

The engine that won the war contract. Barney Roos rebuilt an unremarkable ~48 hp passenger-car four into 60 hp with 105 lb-ft of torque — enough to out-pull both the Bantam and Ford entries in the 1940 trials. Its power advantage is the single mechanical reason "Jeep" became a Willys word rather than a Bantam or Ford one. Powered the MB, GPW, CJ-2A, CJ-3A, and early wagons.