The A761E transmission is Toyota's first automatic six speed transmission. It is said that it is the lightest sixspeed automatic transmission in the world weighing in at 85 Kg wet. This transmission is currently found in the2004 and later Toyota/Lexus models worldwide. It is an enhanced A750E used in various Toyota models. Manyof the parts used in the A750E are the same in the A761E. The most significant deviation is with the addition of aC4 clutch and F4 sprag inside the C1 clutch drum assembly (See Figures 1 and 2). This addition confines clutchto clutch shifting without any sprag assist between 5th and 6th speeds only.The computer strategy which operates the transmission is called the ECT-i: Electronically ControlledTransmission with intelligence. The ECT-i uses additional electronic controls to adjust hydraulic pressuregradually for even smoother shifts. The ECT-i computer also has a limited ability to adjust for wear in thetransmission and even to learn and respond to a person's driving behavior (based on the resulting engine inputconditions).