In 1954 IH replaced its letter‐based model designations with numbers. At the same time the Deering brand name was dropped in favor of International. The first digit of each model number indicated how many plow bottoms the tractor was designed to pull. Both the 300 and 400 series were available as the Farmall row‐crop model or as the lower, wide‐front‐axle multipurpose International tractor. All models offered more engine power than before, and most also had increased displacement. Every Farmall now featured the Fast‐Hitch quick‐attach system first introduced on the Super C (which itself became the 200). This system did away with ball‐ended lift arms; instead, the tractor’s female connectors were recessed and the implement carried forward‐pointing pins. Implements built for Fast‐Hitch would not fit other brands of tractors, and Farmall’s own lineup required three different implement‐size categories. Adapters were advertised, for example, to fit 200‐series implements onto a 300 or even onto a conventional three‐point hitch. Hydraulic innovation came in the form of a two‐way (double‐acting) valve, and as standard or optional equipment there were also second and third hydraulic outlets.

The Farmall 100, which replaced the Farmall A, remained an offset model—meaning the operator sat at the right edge of the tractor while the engine and transmission were off to one side of the centerline. The new 300 and 400 models, succeeding the Super H and M, received a modern instrument panel and electric‐key ignition start. They also carried over the Torque Amplifier drop‐gear quick‐shift feature introduced on the earlier tractors. An independent live PTO driven off the foot clutch was available as an option. A distinctive feature of the Farmall 300 and 400 was the horizontal steering shaft running above the engine, a design element inherited from the very first Farmall tractors. On the International 400 you could get power steering. Finally, the hefty International 600—with its 5.7‐liter engine and 15-inch clutch—was produced for just over a year.

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