Fins These are incorporated into the internal design of the torque converter . To create mechanical torque from hydraulic pressure a unique process is used.
Oil is forced under pressure through the torque converter.
The inside of the converter is made up of layers of steel fins which zigzag in direction and vary in size. First the fins are large but as the layers go on, the fins decrease in size. This unique design generates greater hydraulic pressure as the oil passes through the converter, the strong flow of oil creates a fluid coupling which operates like a clutch , driving the wheels.