Following the 1986 transition of the 5.0L V8 to fuel injection, the 4.9L I6 followed suit for 1987, with the 5.8L and 7.5L engines doing so for 1988; the F-Series became the first American pickup truck model line sold without carbureted engines. The same year, the 6.9L diesel V8 was increased in size to 7.3L. Following the discontinuation of the 3-speed manual, a 5-speed manual became standard equipment (a 4-speed remained a special-order option until 1989). For 1989, an "E4OD" 4-speed automatic (overdrive version of the C6 heavy-duty 3-speed) was introduced.