At the beginning of 1999, the 40-series, which was introduced in 1992, was updated. The new model series was named Forterra. Alongside the previous three turbocharged four-cylinder engines, a naturally aspirated six-cylinder engine purchased from Same/Lamborghini was introduced in the 11641 model (110 hp). The six-cylinder featured an electronic injection pump. The transmission was upgraded, now offering 24+18 gears, and the direction reverser was synchronized. The power shift was still a three-stage hydraulic system. Hydraulic output was now always 60 l/min in the four-cylinder models and 70 l/min in the six-cylinder model. Lifting capacity was increased from before. Bosch electric lift was standard on the six-cylinder and optional on the four-cylinder models.

The appearance was almost unchanged. The cab had curved glass and a redesigned, sleeker dashboard and instrument panel. Like Lamborghini, the 11641 had memory for two electronic hand throttle positions. Noise level was reduced to 79 decibels. The cab could still be ordered with forestry equipment. Forterra sales in Finland remained low as factory difficulties began, eventually leading to Kesko ceasing imports.

In 2000, the six-cylinder was equipped with a turbocharger, increasing power to 116 horsepower.

In 2002, a renewal took place, focusing mainly on streamlining the exterior appearance.

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