An automatic transmission relies on a torque converter and complex planetary gearsets controlled by hydraulic pressure to shift gears. The transmission control module directs solenoids in the valve body to route fluid, engaging different clutch packs as vehicle speed and engine load change. This design provides smooth power delivery and requires no direct shifting input from the driver.
We need to drop the pan on that automatic transmission and inspect the magnet for metal shavings.
Also heard as
- slushbox
- auto
Do not mix it up with
- Automated manual transmission: An automatic uses planetary gears and a torque converter, while an automated manual uses standard gears and a computer-actuated conventional clutch.
Related terms
ATF
Automatic transmission fluid is the specialized hydraulic oil used to lubricate and operate gearboxes.
Torque converter
A fluid coupling that transfers rotating power from the engine to an automatic transmission.
Gear shift
The lever and linkage assembly used by a driver to select transmission ratios.