| Jeffery Quad | |
|---|---|
 U.S. Marines riding in a Jeffery Quad, Fort Santo Domingo, c. 1916 | |
| Overview | |
| Manufacturer | Thomas B. Jeffery Company Nash Motors after 1916 |
| Also called | Nash Quad |
| Production | 1913–1928 |
| Body and chassis | |
| Layout | Front-engine, four-wheel-drive |
| Powertrain | |
| Engine | Buda, 312 cu in (5.1 L) side-valve 4-cylinder, 28 hp (21 kW; 28 PS) |
| Transmission | four-speed, four wheel drive, hub-reduction gearing |
| Dimensions | |
| Length | 200 in (5,080 mm) |
| Width | 74 in (1,880 mm) |
| Height | 85.5 in (2,172 mm) without canopy |
| Curb weight | 5,350 lb (2,427 kg) Payload = 3,000 lb (1,361 kg) |
The Jeffery Quad, also known as the Nash Quad or Quad is a four-wheel drive, 11⁄2-ton rated truck that was developed and built by the Thomas B. Jeffery Company from 1913 in Kenosha, Wisconsin, and after 1916 by Nash Motors, which acquired the Jeffery Company. Production of the Quad continued unchanged through 1928.
The Quad introduced numerous engineering innovations. Its design and durability proved effective in traversing the muddy, rough, and unpaved roads of the times. The Quad also became one of the most successful vehicles in World War I. The Quad was produced in large numbers by Jeffery and Nash, as well as under license by other truck makers.