The frame-steered Allis-Chalmers models 7580 and 8550 were succeeded at the beginning of 1982 by models 4W-220 and 4W-305. The design was modernized and the cab was new. Technical changes were minimal. The engine speed was reduced to 2400 rpm. The 4W-305’s engine was 12.0 liters. The transmission was still 20+4 Power Director with a 2-speed hi-lo gear. The hydraulics were load-sensing. The cab was more spacious than before, and the mechanical noise-conducting linkages were removed. The doors were really large, and the capacity of the air conditioning was increased. The fuel tanks were larger than previously. After the 8000-series four-wheel-drive models came to the market, sales of frame-steer tractors declined, and in total only about 600 units of the 4W models were produced over four years.

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