![]() The upgrade also included a matching 26-spline clutch hub. 788-inch 24-spline input shaft, which was upgraded in 1970 to 26-spline and. Ratios are 2.46 low, 1.46 second and direct high. A few were also used with FE engines, mostly the 390 in full-size cars. Some C4s were built with a larger spread bell housing to use with 351M V8s, but these are rare. By comparison, the 351 Windsor and 351 Cleveland small and intermediate-block engines were backed by the medium-duty FMX or the heavy-duty C6 that debuted in 1966. It was primarily used with Ford's inline six-cylinder engines and small V8 engines (see Ford small block engines), usually up to 302 in³ (5.0 L). The aluminum case and the use of a simpler Simpson planetary gearset reduced the weight significantly (estimated at 185 lbs (83.9Kg)). In designing the C4, Ford used an aluminum alloy, three-piece case ( bell housing, main case, and tailhousing). Because this was confusing, later versions of the C4 were changed to a P-R-N-D-2-1 (or L) pattern typically seen today.īecause of its cast iron construction, the Ford-O-Matic was very heavy. The shifter display appeared as P-R-N-D2-D1-L. If the gear selector was placed into L, the transmission stayed in first gear only. If the transmission was placed in D1, the transmission would start in first gear, then shift to second and third gear as normal. The C4 was designed to be a lighter and simpler replacement for the original Ford-O-Matic two speed transmission being used in smaller, less powerful cars.įord used the term "SelectShift" because in the first C4's, placing the gear selector in D2 forced the transmission to start in second gear and then shift to third gear. ![]() The Ford C4 is a three-speed, medium-duty automatic transmission introduced on 1964 model year vehicles and produced through 1981. 3-speed longitudinal automatic transmission ![]()
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