an alloy intake manifold to a composite design; the oil filler cap switched locations from the driver side to the passenger side of the engine. For 2002, the chassis was given four-wheel disc brakes (replacing rear drum brakes) with the rear discs being the largest offered on a solid rear axle Explorer (11.83" vs 11.2"). The fuel tank was also enlarged from 20 gallons to 22 gallons. Body Built on a lengthened Ford Explorer chassis, the Sport Trac was constructed using parts from three Ford vehicles, with the addition of model-specific pickup truck bed. Sharing the front fascia and fenders with the two-door Explorer Sport, the four-door cab was constructed from the four-door Ford Explorer (with modified rear doors). Designed specifically for the Sport Trac, the 50-inch long pickup bed was constructed entirely of plastic composite material; the tailgate was shared with the Ford F-150 SuperCrew. To add additional load space for the shortened pickup bed, Ford offered a metal load extender to be used with the tailgate. Another option included a removable hard plastic tonneau cover for the pickup bed. Sharing its interior with the two-door and four-door Explorer (which shared much of its dashboard with the Ranger), the Sport Trac retained the fold-down rear seats of the four-door Explorer to expand storage space. A full rubber floor was standard (as in base-trim pickup trucks), with berber-style carpet floor mats. The Sport Trac was configured with a power-retractable "Breezeway" rear window (a feature last used by Ford on the 1965 Mercury line) in place of a sliding rear window. During 2002, several changes were made to the exterior badging, with "Explorer" removed from the doors and "Sport Trac" (on the tailgate) changed to chrome, from red/white plastic. In another revision, the B-pillars were changed from black to body-colored. For 2004, the gray bumpers and side skirts were darkened in color; a new option offered body-color bumpers and side skirts. Trim In line with the second-generation Ford Explorer four-door, beginning in 2002, the Ford Explorer Sport Trac was offered in a XLS trim level (steel wheels, cloth seats) and an XLT trim level (alloy wheels), and 2003, an XLT Premium trim level (leather seats) XLS - Included: cloth upholstery, styled-steel rims, air conditioning, an AM/FM stereo with single-CD player and four speakers (60W), power doors and windows with auto drivers side window, and a tachometer. XLT - Added: automatic transmission,