The Input Speed Sensor provides information on how fast the input shaft is rotating. The 45RFE / 545RFE transmissions use two sensors, an input speed sensor and an output speed sensor. The 42RE transmissions use a single sensor (located on the overdrive gear case, over the park gear). They are mounted in the left side of the transmission case and are considered primary inputs to the Transmission Control Module (TCM). The Input and Output Speed Sensors are two-wire magnetic pickup devices that generate AC signals as rotation occurs. Speed sensors location on the 45RFE / 545RFE transmission Transmission input & output speed sensors Jeep Grand Cherokee WJ - Transmission Speed Sensors
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