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The largest models in Fiat’s new lineup of the 1970s were the 850 and 900. The 850 was equipped with a 4-cylinder 4.9-liter OM engine, while the 900 surprisingly had only a 4.7-liter six-cylinder.

The transmission was fully synchronized with 12+4 speeds. The gear levers were located under the steering wheel on the dashboard. Unlike the smaller models, the 850 had draft arm sensing and oil-bath disc brakes. In the power take-off independent of the driving clutch, there were speeds of 540 and 1000 rpm, plus a live PTO. The lifting capacities of 2600 kg (850) and 3000 kg (900) were quite large at the time.

In spring 1972, the power of the 850 was increased to 90 horsepower, and the model name became 850 Special. The 900 was replaced by the 1000, which had a new 5.2-liter six-cylinder. At the same time, the front axles of the four-wheel drives were equipped with planetary gears, like the smaller models. A year later, the flagship of the lineup was introduced, the Fiat 1300 DT, equipped with a 7.4-liter OM engine. In a few countries, a 5.5-liter 1100 Super was also sold, with 110 hp.

For the operator's cabin, these models also initially used the Terä cabin in Finland. In the 1972 model, cushioning was added to reduce noise, and the rear wall was almost solid.

At the beginning of 1977, more powerful 1000 S (110 hp) and 1300 S (150 hp) models arrived in Finland. The S models were imported with Italian original cabins (1000 S also with Sekura cabins). These quite esteemed models remained on sale until 1979, when the Grandi series was introduced. Alongside the 1000 S and 1300 S, the 850 S was still in production, now in a 95-horsepower version. However, after the introduction of the 880, it was not imported to Finland. The lengths listed in the table are measured without draft arms. The length of the 1300 DT with draft arms is 458 cm. In many countries, the 1300 S was known by the power-equivalent designation 1500, and the 1000 S likewise as 1100. The 850 S was also known in some countries as the 900, using the same number as the earlier 6-cylinder model. The Fiat 800, on the other hand, was a tractor corresponding to the 850 S, equipped with the 4.5-liter 80-horsepower engine from the 750 S.

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