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Some automatic transmissions use brake bands to stop or hold a clutch drum from turning. The brake band can be static that is the bandreleases at the appropriate time such as the Powerglide Low Band or holds for reverse. When the band is applied during a gear to a spinning clutch drum to stop the drum from spinning the band is said to be a dynamic shifting band, such as the 4L60E 3/4 Band. Thus there two types of friction materials: Static friction material is hard with a high sheer strength. While dynamic friction materials are more sponge like holding oil, as the band is applied the oil is squeezed out dissipating heat. Dynamic friction materials come in a wide range of colors and holding properties rated by their coefficient of friction.

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