FORD TRANSMISSION INFORMATION (Automatics) This section covers stock Ford transmissions, standard modifications, gear ratios, and bolt patterns. The general informationprovided will apply to most conversions in this book. C4: This 3 speed transmission was used in Ford cars & trucks from 1964 to 1981. We recommend obtaining a 1970 & newer transmission for conversions. The transmissioncase length is 11.180”, and with the bellhousing measures 17.00”. This transmission was used up against small block Ford engines. The adapters we manufac- ture will normally require the installation of a new output shaft. This is the most popular transmission when converting to aFord engine. The 1st gear ratio is 2.46:1; 2nd 1.46:1, anda 1:1 3rd gear ratio.get
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