The flagship models of IMT's lineup from 1977 until the late 1990s were chassis-steered models that closely resembled Massey Ferguson's 1500/1800 and 4000 series. Even the decals were similar. However, there was no license from MF. In the three smallest models, the 5160, 5200, and 5220, six-cylinder engines from the local truck manufacturer FAP-Famos were used, which were based on an old Mercedes-Benz license.

The 5270 and 5360 models introduced in 1983 featured Mercedes V10 and V12 engines. Later, the 5200 was also equipped with a Mercedes engine. Europe’s largest tractor, the IMT 5500, had a turbocharged Mercedes V12 producing 517 horsepower. The power ratings of the smaller chassis-steered models roughly corresponded to the latter part of their model numbers. An exception to this was the later 5220 DL, whose turbocharged FAP engine produced 280 horsepower. The transmissions in the chassis-steered models were mechanical with 9+1 gears, and the two largest models had 16+2. The chassis-steered tractors were mainly sold to state farms in the home country and neighboring countries.

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