The fifth generation of the Ford F-Series was introduced in 1967 and spanned until 1972. Known by enthusiasts as the "Bumpside," the fifth-generation F-Series continued with the same platform as the previous Fourth Generation. Still, they featured sharper styling, a larger cabin, and overall greenhouse improvements with comfort amenities and engine options. The F-100 continued as a light-duty truck with more car-like features, whereas the F-250 and F-350 featured the same styling and features but were more heavy-duty. In addition to the Standard Cab (2-Door), a Crewcab or (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 series featured Ford's Twin I Beam front suspension. A four-speed manual, three-on-the-tree manual, or a three-speed Cruise-O-Matic automatic transmission were options. 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. In addition to the standard light-duty variants, Heavy Duty variants were also produced. Ford built the fifth generation until 1972 when they replaced it with the Sixth Generation F-Series.