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of the second set. Front Sun Gear Rear Sun Gear Rear Carrier amp。 Front Annulus/ Ring Gear/Output Shaft Front Carrier amp。 Rear Annulus/ Ring Gear 27 27 Shift Control Automatic transmissions use different driving devices, usually multiplate clutches, to send the power flow to the proper gearset member and different reaction devices to hold the proper member in reaction. These members are applied or released to get the proper gear ratio. 28 28 Shift Control Automatic trans missions use different driving devices, usually multiplate clutches, to send the power flow to the proper gearset member and different reaction devices to hold the proper member in reaction. 29 29 Plaary Operation This chart shows how a simple plaary gearset can produce six different gear ratios depending on which member is driven or held. In addition to the three reduction or overdrive (OD) or forward or reverse ratios, a direct drive, 1:1, ratio occurs if two members are driven. Neutral results if no members are driven. 1: 2: 3: 4: 5: 6: