Alongside the 6600 and 7600, larger and better-equipped parallel models 6700 and 7700 were introduced in the autumn of 1976. These models featured, among other things, hydrostatic steering, Load Monitor tractive force sensing, a 1000 rpm power take-off, and a Dual Power low-range quick shift operated by a foot pedal as standard. The flat-floor cab equipped with suspended pedals was very tall.

The front axle was different from that of the 6600 and 7600. From 1978 onwards, the 7700 was also available with a ZF-driven front axle. The production program also included the 5700 model and the 6-cylinder 8100, designed for demanding market areas, which used a 6.2-liter truck engine. There were at least three distinct versions of this model for different national markets. The British 8100 was manufactured by County, and the French by EVA.

The engines of the 6700 and 7700 also grew to 4.4 liters for the year 1981, and the 8100 was replaced by the 8200.

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