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The 4F27E is an electronically controlled 4-speed automatic transaxle transmission developed by Mazda and Ford. Mazda's name for this transmission is FN4A-EL, Ford's name for this transmission is 4F27E. Mazda's FS5A-EL (Ford FNR5) is the 5-speed successor to this transmission which shares many of the same parts.
In 1923, a patent was approved in the United States describing the operation of a transmission where the manual shifting of gears and manual operation of a clutch was eliminated. This patent was submitted by Henry R. Hoffman from Chicago and was titled: Automatic Gear Shift and Speed Control. The patent described the workings of such a ...
The shift from 1st to 2nd or 2nd to 3rd range was long and drawn-out, ending with a harsh shift. The reason for this was that three things were happening. Not only was the transmission shifting to a very much higher range ( 2.93 to 1.56, but it was also simultaneously emptying the fluid coupling and making a mechanical lock-up.
[citation needed] This transmission locks up the torque converter in all gears, increasing wear. Combined with a sealed transmission pan and "lifetime fluid", some people have experienced catastrophic transmission failure. Owners report shift issues when oil begins breaking down beyond 50K miles, hence shifting issues are common. [citation needed]
Shift pattern (2) 2 on/off solenoids Shift quality 6 Variable Force Solenoids · 1 for each clutch · 1 for TCC Torque converter clutch Variable Force Solenoid ECCC · 2 path · turbine damper Converter size 238 mm (9.37 in) 258 mm (10.16 in) Fluid type DEXRON High Performance ATF Fluid capacity 10.8 L (11.4 US qt) [a] 10.3 L (10.9 US qt) [b]
The typical modern TCU uses signals from engine sensors, automatic transmission sensors and from other electronic controllers to determine when and how to shift. [2] More modern designs share inputs or obtain information from an input to the ECU, whereas older designs often have their own dedicated inputs and sensors on the engine components.
The Ford unit is a six-speed with one clutch acting on reverse, first, third, and fifth gears, and the other used for second, fourth, sixth gears. As the first gear is engaged, the 2-4-6 clutch is disengaged and the second gear cogs are engaged. At the appropriate time, the R-1-3-5 clutch is disengaged and the 2-4-6 clutch is engaged.
The Ultradrive is an automatic transmission manufactured by Chrysler beginning in the 1989 model year.. Initially produced in a single four-speed variant paired with the Mitsubishi (6G72) 3.0-liter engine in vehicles with transverse engines, application was expanded to the Chrysler 3.3- and 3.8-liter V6 engines in 1990 model year Dodge Caravan/Grand Caravan, Plymouth Voyager/Grand Voyager ...