EQUIPMENT DESCRIPTION: THE “CHECK TRANSMISSION” LIGHT IN CERTAIN ALLISON MD WORLD TRANSMISSIONS, A DIVISION OF THE GENERAL MOTORS CORPORATION, WAS INCORRECTLY CALIBRATED INTO THE ELECTRONIC CONTROL UNIT (ECU). THESE TRANSMISSION WERE INSTALLED ON CERTAIN INTERNATIONAL NGV 4000 / 7000 SERIES TRUCKS. THE “CHECK TRANSMISSION” LIGHT INDICATES TO THE DRIVER THAT THE TRANSMISSION IS NOT FULLY OPERATIONAL, AND THAT IT SHOULD BE REPAIRED IMMEDIATELY. IN THOSE INSTANCES THAT THE “CHECK TRANSMISSION” LIGHT WOULD NORMALLY BE ILLUMINATED AS A RESULT OF A PROBLEM THAT PREVENTS DIRECTION CHANGES (SUCH AS SHIFT SELECTOR MALFUNCTION) THE DRIVER MAY NOT BE ADEQUATELY AWARE OF THE PROBLEM.