The Fifth Generation of the Ford F-Series, commonly known by enthusiasts as the "Bumpside," was introduced for the 1967 model year. The F-250 model series continued with the same platform as the previous Fourth Generation F-Series. Still, they featured sharper styling, a larger cabin, and overall greenhouse improvements with comfort amenities and engine options. The F-250 shared most of the same styling and other features as the F-100. However, it featured axles with greater capacity, larger brakes, and 3.89-inch frame section modules. In addition to the Standard Cab (2-Door), or a Crewcab (4-door) was available on the F-250 and F-350 platforms. Styleside and Flareside beds were available in either 6 1/2 or 8 foot bed configurations. All F-Series featured Ford's Twin I Beam front suspension. Engines offered were two six-cylinder 240cid, 300cid, and three V8's, 352cid, 360cid, and 390cid. A four-speed manual, three-on-the-tree manual, or a three-speed Cruise-O-Matic automatic transmission were options. The F-350 did not offer a 4X4 drivetrain until 1979, and the F-250 "Highboy" filled that void. Although the term "Highboy" was never used by Ford, the "Highboy" shared many components like the cab mounts, suspension, axles, and larger frame of the F-350. These trucks featured a divorced transfer case, and Dana 24 axles and 4.10 gears. 4" lift blocks on the rear axle and larger front springs brought the truck to a ride height of approximately 3" higher than a 4X4 F-100/F-150 and 6" taller than a two-wheel-drive F-250. All "Highboy" trucks had F26 and F28 in the Vehicle Identification Numbers. Three trim levels were available during the production of the Fifth Generation F-Series, though the names were changed in 1970. The "Base" trim became the "Custom," and the "Custom Cab" became the "Sport Custom," joining "Ranger" as optional levels of equipment and trim. Late in production, the Ranger trim level was upgraded with the additional "Ranger XLT" option. Styling features on the interior and exterior were changed every year to appeal to a more car-like feel. Ford built the Fifth Generation until 1972 when they replaced it with the Sixth Generation F-Series.