S-tronic also known as "transmission hybrid" because it combines the advantages of a manual gearbox and automatic transmission. On this gearbox instead of using the friction clutch on the gearbox seemed normal mechanics that uses friction plates combined with hydraulic torque converter on the automatic transmission as helping the process becomes smoother gear changes softer. However, this is not the automatic transmission S-tronic because using the outer gear wheels rather use a planetary gear transmission, gear pairs, combined with two independent axes lead from the friction disk can make 7 different levels of communication - something that the conventional mechanical gearbox or automatic transmission does not meet due to inconvenient when you want to transfer.
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