Allis-Chalmers D series - Wikipedia
D14. The D14 was the first D-series model, introduced in 1957 as an all-new tractor. The engine was a new 149-cubic-inch (2,440 cc) Allis-Chalmers Power-Crater four-cylinder engine, available in gasoline and LP gas fuels. The engine was coupled to a four-speed transmission with a transfer case, giving a total of eight forward gears and two reverse.