| Mack AC | |
|---|---|
 A Mack AC in September 1918 | |
| Overview | |
| Manufacturer | Mack Trucks |
| Also called | Bulldog |
| Production | 1916–1938 |
| Designer | Edward Hewitt |
| Body and chassis | |
| Class | 31⁄2-ton, 51⁄2-ton or 71⁄2-ton |
| Powertrain | |
| Engine | 4-cylinder 74 bhp (55 kW) petrol |
| Transmission | 3 speed selective with clutch brake |
| Propulsion | 4x2 |
| Chronology | |
| Predecessor | Mack Senior |
| Successor | Mack BC |
The Mack AC was a heavy cargo truck designed in the 1910s by the American manufacturer Mack Trucks. Introduced in 1916, the Mack AC saw extensive service during the First World War with the British and American armed forces, in British service it was given the nickname the "Bulldog" which led to Mack adopting the Bulldog as its corporate symbol.