Transgo 4R44E 5R55E Transmission Shift Kit SK 44-55E Fits 1994-2007 4R44E, 4R55E, 5R44E and 5R55E Aerostar, Ranger, Explorer, Bronco, Mazda "Engine sizes include 2.3, 3.0 and 4.0 Liter V6 " Includes High Temp Clutch Rings, EPC relief system and other calibration items to improve overall drivability and durability. Addresses Forward clutch failure and 2-3 Cutloose; Hard throttle 2-3 slip; 2nd and 4th band failure; won't move. Allows for shift feel calibration. Installation recommendation: Experienced technician Transmission removal necessary: No