At the beginning of 1974, the first new series 6-cylinder models 951 and 1151 were introduced. The displacements of the MWM engines were 5.6 and 6.2 liters. In terms of basic technology, the models were similar to the smaller 751 and 851. The transmission was a fully synchronized directional change gearbox with 12+12 gears, with creep gears equipped totaling 16+16. The lifting capacity was 3100 kg.

In 1974, the prototype 1401 was introduced first, followed later by the production model 1451, which elevated Renault into a new power class. However, the success was not great: 230 units were produced over 6 years. The transmission was the ZF 16+6 gear type also used by IH and Fendt. The front axle was also made by ZF. The hydraulics were simpler in operation compared to other models and did not include the Tracto Control system.

In 1976, the 1151 was replaced by the slightly more powerful 1181, which had a lifting capacity of 4150 kg. The following year, the 951 was replaced by the models 891 and 981. At least in German-speaking countries, the 921, which was 3 hp more powerful, was sold instead of the 891. The six-cylinder machines could be equipped with a reverse driving setup, which included, among other things, a separate steering wheel at the rear.

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