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The torque converter is often seen as the most complicated part in vehicles of today. It is, however, a very important component of automatic transmissions. This animation explains the theory behind this complex component.

Contents
1) Torque converter impeller
2) Blades and fluid of impeller
3) Centrifugal forces caused by rotation of impeller
4) Torque converter turbine
5) Fluid flow between impeller and turbine
6) Fluid coupling
7) Torque converter stator
8) Housing, lockup clutch and shaft
9) Stages of operation: stall, acceleration, coupling