In 1988, the American models transitioned from the 50 series to the 55 series. The engines were thoroughly updated, now offering a 38% increase in torque as well as a constant power output in the RPM range of 1700-2200. The four-wheel drive would disengage when the steering brake was applied to improve turning. The 4755 and 4955 models featured electronic draft sensing. The instrument panel was electronic, and an optional radar-based computer was available. Electronics were also extensively utilized for fault diagnostics.

On the American market, the 4555 model was also known, which was similar in structure and dimensions to the larger models. The smaller models of the 55 series were replaced in 1992 by the new 7000 series. The two largest 55 series models continued in Europe until 1994, but in the USA they were replaced by the 60 series.

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