7 Important Parts of an Automatic Transmission


7 Important Parts of an Automatic TransmissionAs highly complex mechanisms, transmissions require many interconnected parts to work together to ensure the proper transfer of power. Because transmissions are so intricate, seemingly minor problems with them can quickly worsen and require very expensive repairs. This makes it important to get to the shop at the first indication of transmission trouble, which will hopefully allow the mechanic to nip in the bud any developing problems. Here's a look at the important components of an automatic transmission.


Fluid pressure controls almost all components of an automatic transmission. The pump is crucial to creating the required pressure as it pulls transmission fluid from the filter and directs it to other regions of the transmission.

Automatic Transmission Fluid

For optimal transmission health, it's important to consistently drive with the correct amount of clean automatic transmission fluid. Because transmission fluids can become polluted with contaminants, it should be flushed at the mileage intervals recommended by your owner's manual.

Planetary Gear Set

The planetary gear set, which determines gear ratios, is composed of planet gears, a sun gear, and a ring gear. For all transmission components to function properly, the planetary gear set needs to work like it should.

Torque Converter

Torque converters are hydraulic fluid couplings that connect the transmission and engine. They play a central role in generating the torque required for your vehicle to accelerate, as well as to remain in gear when stopped.

Clutches & Bands

For proper rotating, engaging, and disengaging, clutches & bands need to be kept in good condition.

Valve Body

There are several passageways within the valve body where pressurized transmission fluid is sent to different valves.

Speed Sensors

Transmission speed sensors determine which gear the vehicle should be in by calculating the transmission's actual gear ratio while it's operating.

If you need transmission repair, be sure to visit a reputable specialist. For transmission repair in Houston, TX, contact the experts at A1 American Transmission at (281) 954-3756. Feel free to give A1 American Transmission a call today to schedule an appointment for any of your vehicle's transmission needs!

A1 American Transmission Blog
Posted: October 21, 2020

Written and Published By MORBiZ

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