In the more angular Farmall and International 60 models introduced in 1958, completely new six-cylinder engines were fitted. The electrical system was now 12 volts. Apart from changes in gear ratios, the powertrain remained essentially the same. There were 5+1 gears, and with the Torque Amplifier quick-shift feature, 10+2. The PTO was independent of the clutch pedal. Instead of IH’s own Fast-Hitch system, the lift could also be equipped with a three-point quick coupling. For the hydraulics, you could choose either a 45-liter or a 64-liter pump. Hydrostatic steering was available as an option on the IH models—that is, the versions fitted with a wide front axle. A new feature in the hydraulic controls was the ability to switch from single-acting to double-acting using levers on the dashboard.

By far the most popular model in the range was the Farmall 560, even though it’s mentioned as one of the worst tractors in IH’s history. The problems were failure of the final drive and poor diesel starting performance. The improved powertrain was retrofitted to the 20,000 tractors built up to that point. The model 660 was very different from its predecessor. Earlier models had a large, heavy-duty engine and 5+1 gears. This time, the 660 was based on the smaller models—mainly by increasing the engine’s operating speed—and the quick-shift gearbox was standard. At least the diesel engine now started with an ignition key and starter motor instead of the previous gasoline-start system.

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