the newly introduced Explorer and redesigned E-Series and Ranger, the F-Series received a slightly lower hoodline, rounding the front fenders, bumper, and grille. The F-Series received a driver-side airbag starting in the 1994 model year. After a six-year hiatus, the FlareSide bed made its return, becoming a submodel of the F-150. To appeal to younger buyers, the bodywork of the FlareSide bed was modernized, adapting the fenders of a dual rear-wheel F-350 to a single rear-wheel chassis. To commemorate the 75th anniversary of the first Ford factory-produced truck (the 1917 Ford Model TT), Ford offered a 75th-anniversary package on its 1992 F-series, consisting of a stripe package, an argent-colored step bumper, and special 75th-anniversary logos. In response to the Chevrolet 454SS pickup truck, Ford introduced the SVT Lightning, powered by a 240 hp 5.8 L V8. For 1993, a turbocharger became available on the 7.3L "IDI" diesel. In the middle of the 1994 model year (referred to as "1994.5"), International replaced the IDI with the new 7.3 L T444E turbo diesel, the first engine branded as a Ford PowerStroke. While sharing its predecessor's displacement, the engine was an entirely new design. For the 1997 model year, the ninth generation was gradually phased out of production; the F-150 was replaced by the tenth-generation F-Series (see below), with the F-250 (rebranded as the F-250 Heavy Duty) and F-350 remaining in production through the 97 model year. Introduced mid 1998 (as 99 models), the larger F-Series trucks (and the F-Super Duty) were replaced by Ford Super Duty pickups. Tenth generation (1997–2004) For the 1997 model year, Ford made a substantial change to the F-Series range of trucks, splitting its pickup line into two vehicle families. From the 1970s to the 1990s, pickup trucks had transitioned in usage. Alongside vehicles designed exclusively for work use, the market segment saw a major increase in demand for dual-purpose vehicles for both work and personal use, effectively serving as a second car. To further expand its growing market share, Ford sought to develop vehicles for both types of buyers, repackaging the F-150 in a more contemporary design (as a larger version of the Ranger) while retaining the heavier-duty F-250 and F-350 for customers interested in a work-use vehicle. The tenth-generation F-Series was introduced in January 1996 as a 1997 model. Initially released solely as the F-150, a higher-GVWR F-250 was released in 1997. The model line was