Here's the translation into English:

The 946-1246 models were replaced by the C series models 955 and 1055 introduced in 1977, as well as the D series 1255 and 1455 introduced in 1979. The C series was manufactured in Germany, France, and South Africa, while the D series was produced only in Germany. The tractors manufactured in Germany already used the flat-floor Comfort 2000 cab, which was also used in previous models.

The 955 and 1055 had IH's own 16+8 Synchron transmission with a mechanical underdrive powershift. The 1255 and 1455, on the other hand, had the old ZF 12+5 or 16+7, the latter featuring more low gears. The front axles on the four-wheel drive models were ZF models with a rather small steering angle. The front axle had a friction lock, except for the first years of the 955 and 1055 models. The brakes on the 955 and 1055 were changed to oil-immersed types in 1979. The 1255 and 1455 used drum brakes.

The engine of the 955 was enlarged in 1979 to the same 5.9-liter unit used in the 1055 and, as a turbocharged version, in the 1255. The 1455 got a new 6.6-liter engine. A torque converter was available for both the 1255 and 1455. The lifting capacity of the 1255 and 1455 was a good just-under-5-tons for its time, and with auxiliary cylinders it could be raised to 6.15 tons.

In Finland, power figures were once again reported as peak power instead of the DIN standard: 95 hp for the 955, 110 hp for the 1055, 135 hp for the 1255, and 160 hp for the 1455.

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