parent company of company rival Case Corporation; the IHC name and its logo were assets of the Agricultural Division, consequently part of the sale. Tenneco created the merged Case IH (as both brands currently remain). Following the sale to Tenneco, all that remained of the company were the International Truck and Engine Divisions. In response to the sale of its own brand and logo, International Harvester reintroduced itself on February 20, 1986, as Navistar International Corporation (combining "Navi-" of Navigation and "Star" from multiple truck lines). Navistar International became the parent company of International Truck and Engine Corporation (the previous Truck and Engine Division), with an orange-red diamond logo replacing the IH "tractor" logo. In 1987, International introduced the 8300, marking a second generation of the IHC S-Series. Designated as the "Thousand Series" by the marketplace, the 8300 was joined by additional Class 7/8 tractors and by the 4000-series medium-duty trucks in 1989. To upgrade fuel economy, the Thousand-Series trucks received an aerodynamic hood with faired in headlamps and turn signals; a body-color grille replaced chrome trim. 1990s In 1990, International introduced the 9400, an aerodynamic Class 8 truck derived from the Transtar/Paystar cab, using a set-back front axle (to allow for a longer, sloped hood); the classic-style 9300 (the previous Transtar) continued. In 1991, the final remnant of International in the automotive segment was sold off, as the Scout and Light Truck parts business was sold to Scout/Light Line Distributors, Inc. The same year, Navistar became the parent company of a school bus manufacturer as it purchased one-third of American Transportation Corporation (AmTran). Serving as a chassis supplier since the 1920s, Navistar gained significant market share in school bus production, acquiring AmTran entirely in April 1995. In 1994, the IDI diesel was replaced by the all-new T444E diesel V8. Sharing only displacement with its predecessor, the T444E introduced direct injection and standard turbocharging; the engine marked the introduction of the PowerStroke diesel branding for Ford vehicles. In 1998, following a decline in demand for COE trucks in North America, the 9800 was discontinued and production moved to Brazil. 2000s After nearly a century of business in Chicago, Navistar announced its plans on 30 September 2000 to leave the city and relocate its corporate offices to west suburban Warrenville, Illinois. In 2000, the 5000/9000-series trucks (Paystar/Transtar) received their first redesign of the cab since 1971, becoming the 5000i/9000i; the cab