cab with the Transtar, using a heavier-duty chassis, steel fenders, and a flat-panel hood. The medium-duty Loadstar received an optional tilting hood with a larger grille and straighter-edge fenders (updating its appearance for the first time in 10 years). In 1974, the Transtar II COE was introduced, following a redesign of the Transtar. Distinguished by top-mounted windshield wipers, the Transtar II standardized the previous raised-cab option, as the previous 852 cubic-inch Detroit Diesel 12V71 V12 was replaced by some of the largest-displacement engines ever fitted to a road-going vehicle, including the Cummins KTA diesel I6 (1,150 cubic inches) and the Caterpillar 3408 diesel V8 (1,099 cubic inches). On the other end of the size scale, the Cargostar underwent a second update, with a slightly wider cab and a much larger grille (sharing the black trim band of the Transtar COE grille). For 1976, International launched its "Eagle" flagship brand, used into the 2010s. In 1977, the International S-series was introduced, consolidating the Fleetstar and Loadstar into a single model range. While less comprehensive than the product ranges of the 1930s to the 1950s, the S-series product line included medium-duty, heavy-duty, severe-service, and highway trucks (along with a new generation of the Schoolmaster bus chassis) from the Class 5 to Class 8 size ranges. At its 1977 launch, the S-series was introduced to replace the Fleetstar, with lighter-duty models phased in to replace the Loadstar during 1979. Competing against an extensive segment of the truck industry, the S-Series was produced in multiple layouts, hood lengths, and axle configurations; gasoline and diesel engines were offered. Produced as a cowled chassis (Schoolmaster), straight truck, or semitractor, the S-Series was produced from 1977 to 2004, remaining the longest-produced vehicle line ever produced by International (as either International Harvester or Navistar). 1980s In 1981, International introduced the CO9670, replacing the Transtar II. Sharing only the trapezoidal grille with the previous Transtar II, the CO9670 was designed with a larger cab with improved visibility and improved access (larger windshield, shared doors with the Transtar/Paystar conventional); to increase fuel economy, the Cummins KTA diesel was replaced by a turbocharged Cummins N-series I6. For 1985, the Transtar conventional was reintroduced, becoming the International 9000 series; while the short-hood Transtar was discontinued (overlapped by the S2200 and S2300 Class 8 tractors), the long-hood 4300 was renamed the International 9370. Sharing its cab with the Transtar, the 9370 was restyled