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4T60E N, W, U, J 38791 is a hand held diagnostic Tool designed to perform diagnostic function Tests on each solenoid from inside the vehicle to allow for road Testing if necessary. with Adapter Harnesses for the 440 T4,F7 and 4T60E, the Tool is Hooked up in series at the Transaxle to allow a technician to manually override the ECM/PCM and watch the operation of each solenoid by viewing the LED"s on the face of the Tool.