The 1974 U 120 was the first model of the new generation, and different size classes gradually transitioned to the new series. The series was largely technically identical to the MB Trac. In 1976, the model designations were changed to longer ones. The U 600-1100 models were largely similar to the earlier U 52-100 models. Completely new were the U 1300-1700 models. These models had separate Agrar parallel models with a short wheelbase designed for agricultural use.

The U 1300 and U 1500 were replaced in the late 1980s by the U 1400 (136 hp) and U 1600 (156 hp) models, which had a shorter 265 cm wheelbase, while the 281 cm wheelbase remained only in the U 1700 model. At this stage, options were added such as the Unicomp 1 onboard computer and the EFR hydro-tronic electrically operated lift device for both front and rear.

Characteristic features of the Unimog were the 4 equally sized driving wheels, suspended front and rear axles, and dry disc brakes with air pressure assistance. A three-point hitch was available for both front and rear, with power take-offs at the front, rear, and center.

In 1992, the 90-140 horsepower models were renewed, and the flagship U 2400 was introduced. In 2000, the new Unimog series U 300, U 400, and U 500 were introduced, which were later complemented by the 1000 series models.

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