What are the important parts of an automatic transmission?

What are the important parts of an automatic transmission?

Automotive transmissions are intricate mechanisms through which power created by the engine is transferred to wheels. Because transmission issues are notorious for quickly worsening, it's important to take action at the first sign of a problem, such as gear slippage or a transmission fluid leak. In some instances of major transmission trouble, it makes more financial sense to go with transmission replacement. In such a case, you'll want to be sure you get a transmission from a reputable supplier. At Total Transmission Supply, we sell expertly rebuilt transmissions from all manufacturers. Here's a look at the main components of an automatic transmission.

Planetary Gear Set

The planetary gear set is made up of planet gears, a sun gear, and a ring gear. Through this gear set, gear ratios are determined. All other transmission components act in accordance with the planetary gear set.

Torque Converter

Torque converters are hydraulic fluid couplings that connect the engine and transmission. To create proper torque for acceleration, it's important that you don't have a torque converter issue. Torque converters also play a crucial role in keeping the car in gear while it's stopped.

Transmission Fluid

Transmission fluid serves a number of important purposes, such as lubrication, enabling proper fluid pressure, cooling, and rust prevention. It's very important that you consistently operate with the proper level of clean transmission fluid. You'll want to get your transmission fluid exchanged at the mileage points specified in your owner's manual.


For fluid pressure to reach its necessary level, it's important that the transmission pump is working just like it should.

Valve Body

The valve body helps with keeping tabs on incoming transmission fluid and determining where it is needed.


Sensors monitor driving speed and calculate which gear the car should be in at a given velocity.

Clutches & Bands

For gears to be able to correctly rotate, engate, and disengage, it's important that clutches and bands are in good shape.

If you need a replacement transmission, contact Total Transmission Supply at (855) 907-0390. We ship expertly rebuilt transmissions to anywhere in the U.S. Feel free to give us a call today to ask about our inventory!

Total Transmission Supply Blog
Posted: September 2021

Written and Published By MORBiZ