Important Parts in an Automatic Transmission

Important Parts in an Automatic Transmission

Important Parts in an Automatic TransmissionAutomatic transmissions are highly intricate mechanisms that have many moving parts. These parts work in concert to transfer power from the engine to the wheels. Because transmission issues are notorious for worsening in a hurry, it's important to get to the shop at the first sign of trouble. By acting quickly, you'll have the best chance to prevent the need for major repairs. At SM Transmissions, we can expertly address any of your automatic transmission problems. Here's a look at important automatic transmission components.

Torque Converter

As hydraulic fluid couplings that connect the transmission and engine, torque converters are essential to healthy acceleration. They also play an integral role in keeping the car in gear when it isn't moving.


For fluid pressure to rise to its necessary level, it's important that the pump is functioning like it should.

Planetary Gear Set

The planetary gear set is essential to determining gear ratios. This gear set is made up of planet gears, a sun gear, and a ring gear.

Automatic Transmission Fluid

Driving with the right level of unpolluted automatic transmission fluid is absolutely crucial to healthy transmission function. Automatic transmission fluid serves multiple important purposes. It lubricates, cools, prevents rust, and enables proper fluid pressure. While it's often recommended that transmission fluid gets flushed at some point between 30,000 and 50,000 miles, it's always best to check your owner's manual to see your vehicle's exact requirement.

Valve Body

Through the valve body's channels, automatic transmission fluid is sent to valves as necessary.

Clutches & Bands

Clutches and bands help to enable the gears to properly rotate, engage, and disengage.


Sensors do the important job of monitoring the vehicle's velocity and figuring out which gear you should be in as you speed up and slow down.

Automatic Transmission Service in Grand Prairie, TX

When you need transmission service in Grand Prairie and the surrounding area, contact SM Transmissions at (469) 908-3690. At our local transmission shop, we can expertly address any of your vehicle's transmission needs. Feel free to give us a call today to make an appointment!

SM Transmissions Blog
Posted: December 2021

Written and Published By MORBiZ