Originally, the traditional Unimog 70200 was a rather small agricultural tractor, measuring just 3,520 mm in length. It was only offered as a Cabrio with a canvas roof. The engine power output of 25 DIN-PS (18.5 kW) proved to be insufficient for many applications. To accommodate customer needs, a longer wheelbase version, a proper cab and more powerful engines (up to 34 DIN-PS (25 kW)) were introduced soon after Daimler-Benz took over Unimog manufacture; the traditional Unimog evolved into its final stage, the 411-series. Yet, Daimler-Benz decided that an entirely new, more powerful version of the Unimog would be required to meet future customer expecations. This Unimog version would later be known as 406-series.