![]() ![]() Tandem-axle (6x4) versions of the S series were named F-series trucks. Originally intended to use the International Tristar nameplate, the S series consolidated the aging Loadstar and Fleetstar trucks under a single product line. In a major shift, for 1987, International became the first truck manufacturer to produce a medium-duty product line powered exclusively by diesel engines. Inside, the IHC "tractor" logo on the steering wheel was replaced by a Navistar diamond logo. On the grille, the word "International" across the top of the grille was replaced by a red Navistar "diamond" logo alongside "International" in red at the bottom left of the grille. To reflect the corporate transition of the company from International Harvester to Navistar International, S-series trucks received changes in their badging (alongside all International vehicles). The S series was produced throughout the 1980s, largely unmodified, and 1987 marked several changes to the S-series trucks. Similar in style to the tilting hood introduced for the Loadstar in 1972, all S-series trucks were given a tilting fiberglass hood. To lower maintenance costs, all windows in the cab were designed with flat glass, including the windshield. More vertically oriented than its predecessor, the design was much wider, as well. įollowing the discontinuation of the IHC pickup-truck line in 1975, the S series was designed with a model-specific cab, replacing the pickup-truck cab used for the Loadstar (designed for the 1957 A series). The 21 models of the full lineup had a high degree of parts interghangability this standardization helped lower the number of parts used by 30%. In the summer of 1978, lighter-GVWR models (replacing the Loadstar) were released for sale. The initial lineup consisted of heavier-duty 2200, 2500, and 2600 models (28,000-45,000 lb gross vehicle weight rating - GVWR), replacing the Fleetstar. In April 1977, International Harvester unveiled the medium-duty S series at an event at the New Orleans Superdome. The model designation was used through 1957, when International introduced the A-series model family as an all-new design.įirst generation (S series 1978–1989) Navistar 2500 in use as a municipal service truck During 1955 production, the R series model family underwent an update, with International renaming its light-duty and medium-duty trucks the S-series. The S-series model designation was first used by International Harvester during the 1950s. Previous use of name 1956 International Harvester S100 ![]() After 2001, International phased in product lines based upon the "NGV" architecture severe-service and bus chassis variants produced through 20, respectively. ![]() During 1989, the S-Series underwent a major revision and was split into multiple model lines. The last complete product line designed within the existence of International Harvester, the S series was produced in its original form through 1989. The chassis was produced with both gasoline and diesel powertrains (the latter exclusively after 1986), single or tandem rear axles, and two, four, or, six-wheel drive layouts. Additionally, the S series was produced in other body configurations, including a four-door crew cab, cutaway cab, cowled chassis, and a stripped chassis (primarily for school buses). The IHC S series was produced in a number of variants for a wide variety of applications, including straight trucks, semitractors, vocational trucks, and severe-service trucks. Introduced to consolidate the medium-duty IHC Loadstar and heavy-duty IHC Fleetstar into a single product range, the S series was slotted below the Transtar and Paystar Class 8 conventionals. The International S series is a range of trucks that was manufactured by International Harvester (later Navistar International) from 1977 to 2001. International 4000 series/DuraStar (2001). ![]()
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