In the final Massey-Harris series, there were three models featuring a redesigned hood shape, chrome striping, and a bronze-colored engine. The largest model, the 555, was updated from the previous 55 with minimal changes. It still had Continental’s 6.3-liter gasoline or diesel engine and a 4+1 transmission. The 333 and 444 were equipped with a range extender, offering 10+2 gears. The engine in the 333 was a 3.1-liter gasoline, propane, or diesel, and in the 444, a 4.5-liter. The 555 always had a wide front axle, while the 333 and 444 were also available in the row-crop version with narrow front wheels. The power take-off was an optional extra, operated by a separate clutch with a hand lever. The rear wheels had a quick track-width adjustment – an invention that spread from Allis-Chalmers to other American tractors. Power steering and Ferguson’s three-point hitch were optional extras. The electrical system was now 12 volts.

This model range was not brought to Europe; instead, in Britain, production of the previous model range continued until the end of Massey-Harris.

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