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1956 International Harvester S100. The S-series model designation was first used by International Harvester during the 1950s. During 1955 production, the R series model family underwent an update, with International renaming its light-duty and medium-duty trucks the S-series.
It was an update of the L series, with the same cab, cosmetic changes to the front end, and more engines available. Cab-over-engine models were available. All types of bodies were used, models R-190 and above were available as semi-tractors. In 1955 the light and medium-sized models were replaced with the S Series.
In 1955, the primary International truck line became the S series, with the Travelall now offered on the S-110 or the heavier-duty S-120 ranges, with the SD 220 engine replaced by the BD 220 engine. For 1956, four-wheel drive became offered as a factory-installed option. [1]
International Harvester's first in house six-cylinder engines appeared in some of the 1926 S-series trucks, seemingly a response to market pressures rather than to any particular need for such a layout. [5] In 1928, a new heavy range of trucks (the HS-series) built around a series of engines from Hall-Scott appeared.
For 1955, International replaced the R-series light and medium-duty trucks with the S-series, ranging from the S-110 to the S-184 truck. The model line also included the Schoolmaster bus chassis, Travelall wagon, and Metro delivery van.
The bus chassis variant of the International S series is a cowled bus chassis (conventional style) that was produced by International Harvester (later Navistar International) from 1979 to 2004. Produced primarily for school bus applications, the chassis was also produced for other applications, including commercial-use buses and cutaway-cab buses.
Hundred series and follow-ons, grouped by upgrade (1955–1971) [ edit ] In this timeframe, all Farmall models are row-crop tractors, all International models are utility tractors.
This was followed by the L series in 1949, which was replaced by the R series in 1952, followed by the S series (a name re-used later for IH's larger medium-duty trucks) in 1955. In 1957, to celebrate IH's golden anniversary as a truck manufacturer, this was replaced by the new A line. 'A' stands for anniversary.