2011 GMC SIERRA DENALI Power Train Problems

IN 2017 BEFORE MY VEHICLE COMPLETING TWO YEARS FROM THE DATE OF PURCHASE AT (70,000 KM) THE VEHICLE START SHUDDERING WHEN ACCELERATING AT LOW SPEED, WHEN THE SERVICE WAS DUE I TOOK THE VEHICLE TO DEALER FOR SERVICE & COMPLAINED ABOUT THE SHUDDERING ISSUE, AFTER DIAGNOSING THE VEHICLE THEY SAID THAT THEY HAVE TO REPLACE THE TORQUE CONVERTER, SO THEY DID REPLACE THE TORQUE CONVERTER UNDER WARRANTY AFTER FIXING THE TORQUE CONVERTER ISSUE I FOUND TRACE OF OIL IN FRONT DRIVER SIDE & AGAIN WHEN THE SERVICE WAS DUE I COMPLAINED ABOUT THE LEAK, AFTER DIAGNOSING THE FOUND THAT THE SHOCK ABSORBER IS LEAKING, BUT THEY DIDN'T REPLACE IT BECAUSE IT'S NOT COVERED BY THE WARRANTY AS THEY SAID IT'S CONSIDERED AS CONSUMABLE PARTS, VERY STRANGE FOR A SHOCK TO LEAK IN LESS THAN THREE YEARS CONSIDERING THAT I DIDN'T EVEN DRIVE IT IN OFFF ROAD, & THIS IS NOT...

ON JULY 29, 2015, WHILE DRIVING AT APPROXIMATELY 45 MPH, THE VEHICLE SUDDENLY DOWNSHIFTED ITSELF INTO FIRST GEAR CAUSING THE VEHICLE TO SLOW DOWN SUDDENLY WITH NO NOTICE. I WAS ABLE TO GET THE VEHICLE OFF THE ROAD AND INTO A GAS STATION. AFTER THE FACT THE CHECK ENGINE LIGHT WAS ILLUMINATED. THE VEHICLE WAS TOWED TO THE DEALERSHIP. I WAS TOLD THE TCM (TRANSMISSION CONTROL MODULE) NEEDED REPLACING AND THAT THERE IS A KNOWN ISSUE WITH THIS YEAR TRUCK. THIS IS A VERY DANGEROUS SITUATION TO HAVE YOUR VEHICLE SUDDENLY SLOW DOWN WHILE DRIVING AT SPEED. IF GM KNOWS THAT THE PART IS FAULTY WHY IS THERE NOT A RECALL? WILL IT TAKE MULTIPLE DEATHS BEFORE GM TAKES RESPONSIBILITY?