Gm Automatic Transmissions Gearset Inside Drum
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The planetary gearset fits inside a drum, the clutch pack goes on top of it, followed by a piston that applies pressure to hold one of the elements of the planetary stationary. Additional discs in the clutch pack increase its holding power. Another component, called a sprag, or one-way clutch, may be used to hold the planetaries. View Related Article
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