In 1979, the transition was made to the frame-controlled 40 series. The engines had new turbochargers, the powertrain was improved, lifting capacity was increased, and the seat featured hydraulic suspension. The models were 8440 and 8640. The engine power remained the same as before. An increase of 16% in torque was reported.

Both models were now also available in Europe without dual tires. However, the weight had increased to over 10,000 kilograms. The tractor's most important functions were controlled by an electronic monitoring system. Reverse speeds were now available in the three lowest speed ranges. The quick shift remained two-speed. At least one 8640 was imported new into Finland.

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