At the beginning of 1979, IH introduced its unprecedented long-hooded 2+2 tractors. These were articulated tractors, in which, unlike other designs, the cab was located on the rear unit. The rear end was the same as in the traditional 86-series tractors. The engine was positioned in front of the front axle, and in the middle of the tractor was a 579-liter fuel tank. The engine in the 3388 was a turbocharged 7.1-liter, and in the 3588 a 7.6-liter. The 16+8 transmission was equipped with a 2-speed hydraulic power shift.

In 1980, a more powerful 3788 was introduced, with 200 hp. The gearbox in this model was 12+6.

For 1982, the models were updated. Model numbers became 6388, 6588, and a year later the 6788 was introduced. This was mainly an aesthetic update: the grille’s chrome was changed to black, and the cab's white color became red-black. The rear end now corresponded to the 2-wheel-drive tractors of the 88-series introduced in 1981. The technical specifications remained unchanged. The most significant improvement was made in making shifting easier. At the top of the lineup, the 7288 (210 hp) and 7488 (235 hp) were developed, but soon after production started, in 1984, Tenneco purchased IH, and the production of the 2+2 tractors was quickly discontinued, even though their sales had gone fairly well.

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