A rotary power tool comprising: a motor; an output shaft that receives torque from the motor; a clutch positioned between the motor and the output shaft for selectively engaging the output shaft to the motor; and a transducer for detecting an amount of torque transferred through the clutch to the output shaft, a controller in electrical communication with the transducer for receiving a voltage signal output by the transducer and calibrating the voltage signal to a measure of torque transferred through the clutch; a display device in electrical communication with the controller and operable to display a numerical torque value output by the output shaft 926) for each fastener-driving operation performed by the power tool; wherein the motor includes a drive shaft defined by a first shaft portion and a separate, second shaft portion meshed with a transmission of the power tool; wherein the clutch is interposed between the first and second shaft portions (2030a, 2030b) to selectively couple the first and second shaft portions (2030a, 2030b) for co-rotation; wherein the clutch includes a first coupling disposed on the first shaft portion, a second coupling disposed on the second shaft portion, and a sleeve circumferentially disposed around and movable relative to each of the first and second couplings (2156, 2158); wherein the clutch is capable of being actuated from a first mode in which the output shaft is engaged to the motor, to a second mode in which the output shaft is disengaged from the motor, in response to feedback from the transducer of the detected amount of torque transferred through the clutch. a motor; an output shaft that receives torque from the motor; a clutch positioned between the motor and the output shaft for selectively engaging the output shaft to the motor; and a transducer for detecting an amount of torque transferred through the clutch to the output shaft, a controller in electrical communication with the transducer for receiving a voltage signal output by the transducer and calibrating the voltage signal to a measure of torque transferred through the clutch; a display device in electrical communication with the controller and operable to display a numerical torque value output by the output shaft 926) for each fastener-driving operation performed by the power tool; wherein the motor includes a drive shaft defined by a first shaft portion and a separate, second shaft portion meshed with a transmission of the power tool; wherein the clutch is interposed between the first and second shaft portions (2030a, 2030b) to selectively couple the first and second shaft portions (2030a, 2030b) for co-rotation; wherein the clutch includes a first coupling disposed on the first shaft portion, a second coupling disposed on the second shaft portion, and a sleeve circumferentially disposed around and movable relative to each of the first and second couplings (2156, 2158); wherein the clutch is capable of being actuated from a first mode in which the output shaft is engaged to the motor, to a second mode in which the output shaft is disengaged from the motor, in response to feedback from the transducer of the detected amount of torque transferred through the clutch.