VIOLENT DOWNSHIFT FROM 6TH TO 1ST AT HIGH SPEEDS 60+MPH , SEMI-VIOLENT DOWN-SHIFT FROM 4TH TO 1ST AND MID 25-45PMG, TRANSMISSION REMAINING IN 3RD GEAR INDEPENDENT OF SPEEDS. THIS IS ALL AFTER HAVING COMPLETED THE SOFTWARE UPDATE THAT WAS SUPPOSED TO HAVE FIXED THE ISSUE. AN IMPORTANT NOTE IS THAT MY TRUCK WAS NOT HAVING THIS ISSUE UNTIL THEY DID THE SOFTWARE UPDATE TO PREVENT THIS FROM HAPPENING.