F150 Ford 1990 Pickup Transmission Specificationsby Rob Wagner
The 1990 Ford F-150 pickup truck had four transmission choices: a three- or four-speed automatic and a four- or five-speed manual. Ford built some transmissions and acquired the others from outside vendors or other automakers.
Ford built the C-6 three-speed automatic transmission from 1966 to 1996. It was featured most prominently in Ford Rancheros and Mercury Comets. The C-6 could handle greater horsepower than standard automatics. Its gear ratio was 2.46 for the first gear, 1.46 for the second and 1.00 for the third.
The Ford AOD four-speed automatic saw production from 1980 to 1993. Ford equipped vehicles with big V-8s, such as Lincolns, Mustangs and Ford F-Series trucks, with the AOD. Its gear ratios were 2.40, 1.47, 1.00 and 0.67 -- similar the C-6 automatic. The AOD wide ratio transmission had a 2.84 first gear and 1.55 second gear.
New Process 435
Ford, General Motors and Dodge installed the New Process (NP) 435 four-speed manual transmission in many vehicles. Ford F-150 4X4s used the NP435. The NP435 was produced from 1966 to 1992. Its gear ratios were 6.69, 3.34, 1.79 and 1.00.
Mazda produced the M50D five-speed manual for the 1990 Ford F-150 and compact Ranger pickups. Mazda manufactured it from 1988 to 2000. Its gear ratios were 3.72, 2.20, 1.50, 1.00 and 0.79.