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The 545RFE is based on the 545RE tranny which has been around since 1999. The torque converter and the planetary gear sets are the two main components of an automatic unit. Inside the unit is the planetary gear sets, which are responsible for providing different gear ratios. The bell housing is the place where the tranny connects to the motor. To get a better understanding of how an AT unit works, the best place to start is the bell housing, which contains a torque converter as opposed to a clutch found in manual vehicles. Planetary gearsets in the unit create different gear ratios, allowing the car to shift between different gears based on the communication from the torque converter.The torque-converter connects your motor to the unit and puts pressure on AT fluid to communicate speed.The bell housing contains a torque-converter, which replaces the clutch used in a manual system vehicle

The engine connects to the unit at the bell housing.