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The Oliver 1850, introduced in 1964, featured a new 5.8-liter Dyna-Diesel direct injection diesel engine. Meanwhile, the 1950 model still used GM’s two-stroke diesel engine, which was promised to last 8,000 hours without an engine overhaul. The standard transmission was 6+2 speeds. As options, a 2-speed power shift and/or High Speed gearing were available. The steering was hydrostatic, and the steering wheel was adjustable in depth and height. A 2-speed power take-off (PTO) was available as an option, implemented with a reversible shaft. Four-wheel-drive versions could be ordered with either mechanical or hydrostatic front drive. A safety cab was also available, optionally equipped with air conditioning.

In 1967, the GM-powered 1950 model was replaced by the 1950-T, which had an Oliver-Waukesha 5.1-liter turbocharged diesel engine producing the same 116 hp as before. The price was 10% lower than earlier. This model also offered a 3-speed power shift option.

In 1968, the 2050 and 2150 models were introduced, equipped with a 7.8-liter Oliver-Hercules engine, of which the latter was turbocharged and featured a 14″ ceramic clutch. Oliver’s owner White had just purchased the Hercules engine factory, and the engines used MAN’s M-System direct injection. The wheelbase of these models was also shorter in the Row-Crop version than in the smaller models. The cab had a flat floor, and a cab enclosure was available as an option. The transmission was still an unsynchronized 6+2, to which a 3-speed hydraulic power shift was available as an option. The category III lifting device power could be supplemented, if necessary, with external cylinders of various sizes—delivering up to an impressive 9.5 tons.

A total of just over 1,000 units of the 2050 and 2150 models were produced, of which 100 were sold under the Cockshutt brand. The next 55-series models, the 2055 and 2155, were green-painted Minneapolis-Moline tractors.

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