2009 CADILLAC STS Power Train Problems

THE CAR SIMPLY MADE A GRINDING SOUND AND I LOST ALL CONTROL OF THE VEHICLE. I COULD NOT STEER, BRAKE OR ACCELERATE. THE GEARS WERE CORRODED AND AS A RESULT THE GEAR SHIFT HAD NO CONTROL OVER THE CAR. THE CAR HAS 47,000 AND IS ONLY 5 YEARS OLD AND I WAS TOLD THAT GM DID NOT PUT A SEALANT ON THE UNDERCARRIAGE AND AS A RESULT WATER AND ICE AND ALL OTHER WEATHER AFFECTED THE GEARS AND LITERALLY RUSTED OUT. I AM ALSO TOLD BY THE DEALER THAT WHEN THEY REBUILD THE TRANSMISSION, THEY WILL NOW PUT THAT SEALANT WHERE IT SHOULD HAVE BEEN. TO ME THIS IS A SERIOUS ISSUE. THEY KNOW THIS IS A PROBLEM AND ARE NOW GOING TO BE SURE A SEALANT IS PART OF THE FIX. I AM FORTUNATE THAT I WAS JUST GETTING BACK ON A MAJOR HIGHWAY WHEN THIS OCCURRED. IF I...