The transition to the 40-series with large tractors took place already in 1977. The updates were familiar: more power and lifting capacity. Particular emphasis was placed on the engines' expanded downward torque range. The most powerful model, the 4840, was not brought to Europe. The Power Shift transmission was available at an additional cost. The SG cab remained unchanged, but it was updated to the SG2 version in 1980. These models were not sold in Finland because the single-door, skylight-free cab did not meet occupational safety regulations.

In 1981, a shift was made to mechanical four-wheel drive, whose advantages included lower power loss and better maneuverability. Maneuverability was improved by increasing the wheel turning angle to 50 degrees and the wheel tilt when turning to 13 degrees. The S models had slightly more power and were always four-wheel drive.

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