The five-speed shiftable automatic is an automatic transmission found in many cars that offers the driver the option to change gears manually without the use of a clutch. This option allows the driver to operate the vehicle with the ease of an automatic, but operate in a manner similar to a manual transmission in situations where greater control is necessary or desired.Continue Reading
With the five-speed shiftable automatic, the transmission locks into the selected gear. This gives the vehicle more power when needed, such as when accelerating quickly, and a sportier feel when driving. It allows the driver to select the appropriate gear to take advantage of engine braking when driving on a steep decline.
While manufacturers differ in the design of this option for their vehicles, one common style includes a second shift gate on the transmission selector. The second gate allows joystick-style operation of the shift lever to choose the appropriate gear.
In a sense, all automatic transmissions offer this option. The driver can shift the automatic transmission to L, 3, 2 or 1 to lock out the higher gear ranges. However, with an older style automatic transmission, the vehicle continues to shift into lower gears as the vehicle slows.Learn more about Transmission
Common transmission problems include transmission fluid leaks, worn or damaged torque converters, solenoid damage and clutch problems. When the engine hesitates while driving or won't shift into gear, this typically indicates that it is time to replace the clutch, while grinding and shaking can indicate a problem with the clutch or damage to the gear synchronizers.Full Answer >
Typical problems of an Allison transmission include abnormal shifts, abnormal stall check speeds, slipping of the clutch and abnormal responses. Other problems include the transmission throwing fluid out of the fill tube, excessive engine flares, intermittent noises and the retarder not functioning properly.Full Answer >
Transmission shudder is usually caused by a lack of transmission fluid or a slipping torque converter clutch. Contaminants in the transmission fluid may also lead to transmission shudders, but because the transmission is a closed system, dirty transmission fluid is usually a sign of a larger problem.Full Answer >
When transmission fluid is low, the transmission tends to jerk or slip when changing gears. The vehicle may also speed to high revolutions per minute while in neutral or without the vehicle speeding up or spontaneously slip out of gear. A burning smell is another sign that transmission fluid may be low.Full Answer >