"MODEL TOYOTA TLC76 & TLC79;FRONT E-LOCKING DIFFERENTIAL FITMENT,REAR E-LOCKING DIFFERENTIAL FITMENT,WIRING HARNESS REAR,SWITCHES THIS KIT IS INSTALLED BY MSI ONTO A CUSTOMER TRUCK;THIS MSI FACTORY INSTALLED KIT ENABLES INDEPENDENT ELECTRONIC LOCKING OF FRONT AND REAR DIFFERENTIALS FOR MAXIMUM TRACTION IN OFF ROAD CONDITIONS;ELIMINATES THE NEED FOR AN ON-BOARD AIR COMPRESSOR TO POWER THE LOCKERS;PREVENTS BLOWN AIR SEAL FROM CAUSING A FLUID LEAKE ON THE MISSION AND PUMPING ALL OF THE GEAR OIL OUT"