This 1966 Ford F250 features a 300 c. i. 6 cylinder engine. 3 speed manual transmission. step bumper and a trailer hitch. While the body remained largely unchanged. the 1965 F-Series was given an all-new chassis. This would go on to underpin the F-Series until 1979; consequently. many parts from 1965-1979 interchange such as brakes and motor mounts. An all-new Twin I-Beam front suspension was introduced with coil springs; 1965-1966 F-Series trucks are distinguished a TWIN I-BEAM emblem on the front fender. Twin I-Beam front suspension would go on to be adopted across the light-duty Ford truck lineup and is still in use in the 2013 E-Series vans. In 1965. the 300-cubic inch (4. 9 L) straight six was introduced (a larger version of the 240-cubic inch Six). It had 7 main bearings and timing gears (no chain or belt). The 300 six would remain in the F-Series lineup until the end of the 1996 model year.