In the case of an automatic transmission, there is no driver-operated clutch, which means the gear selector doesn’t slide gears into mesh to complete a shifting mechanism.
Instead, a vehicle with an automatic transmission uses a planetary gear set system.
This won’t require the driver to shift gears manually or cause an interruption of torque flow to change gear ratios.
An automatic transmission usually has a shift linkage that connects to the transmission.
When the driver moves the gear selector, the shift linkage moves a lever at the transmission.
That lever, in turn, operates the manual valve inside of the transmission.
The manual valve then directs fluid flow through the appropriate passages in the valve body to move the vehicle into the desired operating range (drive, reverse, etc.).
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