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TRANSMISSION   TERMS             


Clutch parts    Usually consist of a clutch, pressure plate, throw out bearing and pilot bearing or bushing style. Some front wheel drive vehicles do not have a pilot bearing.

Drive shaft    A long tube usually with u-joints on each end that distributes power from the transmission to the rear end.

D T C (Diagnostic Trouble Codes)     Diagnostic trouble  codes are codes usually retrieved with a scanner assisting you in finding a certain problem.

Flywheel      On automatic transmissions most flywheels bolt to the engine crank shaft and then to the torque converter of  your transmission.

Friction plates (clutches)     Referred to as clutches on automatic transmissions.  These apply in different clutch packs for different gears or forward and or reverse selections.

F W D    This is an abbreviation for Front Wheel Drive. These vehicles have transmissions which are called trans axle.  The trans axle of this style vehicle distributes  power from the engine to the front wheels.

M L P S     This is a Manual Lever Position Sensor. It tells the computer which gear selection you are in. Some dealerships call this sensor a range sensor. They must work properly for your transmission to shift correctly.

Modulator     Most modulators vary line pressure of your transmission  in accordance with the amount of vacuum that is being supplied.

Mounts     Most mounts are formed out of rubber and or some are oil filled.  They usually separate the engine and transmission from sitting against metal cross members or metal support brackets.

R W D (Rear Wheel Drive)     This style vehicle has a transmission that distributes power from the engine to the rear wheels.

Sensors     A lot of sensors that relate to the transmission tell the computer specific information which in turn allows the computer to tell the transmission when and how to shift.

Shift solenoids     The number of transmission shift solenoids vary according to the style of transmission you have. Shift solenoids when energized allow your transmission to shift gears.

Sprags     Sprags usually have elements or rollers that fit around a race that hold one way and free wheel another.

T C C (Torque Converter Clutch)     The Torque Converter Clutch is a torque converter designed to stop slipping,  lock-up and then turn one to one with your motor,  and is commonly called a lock-up style torque converter. It is designed to give you better gas mileage.

T C C Solenoid     This solenoid is usually found inside the transmission and when energized it allows the torque converter clutch to lock up.

T P S (Throttle Position Sensor)     In most cases the Throttle Position Sensor mounts to your carburetor or throttle body and tells the computer how far you are pushing down on the throttle (gas pedal),  which in turn allows the computer to tell the transmission when to shift.

Torque converter        Converts the power of your engine to your transmission. They come in different stalls (The amount of slipping the torque converter does before it starts moving the vehicle).

Transmission     The transmission is a unit that takes the power from your engine and allows you to have different gear ratios as desired.

Transfer case     Unit that usually allows you to have the option of driving in 2 wheel drive or 4 wheel drive, some have high range and low range options.

Valve Body     Usually considered the brain of the transmission, most of the shifting valves of the transmission are located in it.

Vacuum     The vacuum source of gas engines usually connect to your modulator, giving you different transmission shift points. Diesel engines do not make their own vacuum, so most of them have a vacuum pump and vacuum regulator that supplies and varies vacuum to the transmission.

V S S (Vehicle Speed Sensor)    This sensor usually plugs into your transmission and tells  the computer how fast you are going (MPH). In most cases this allows the computer to tell the transmission when to shift,  according to your speed. Some V S S are also found in rear ends and transfer cases.
                                               

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