2001 GMC SIERRA 2500 Power Trainautomatic Transmission Problems

I HAVE OWNED MY 2001 GMC SIERRA 2500HD TRUCK SINCE IT WAS NEW. THE VEHICLE CURRENTLY HAS APPROXIMATELY 92000 MILES ON IT. WITH THE BRAKE LINE PROBLEM I RECENTLY HAD I FIGURED I SHOULD REPORT THE OTHER ISSUES THAT I DON?T THINK I SHOULD BE HAVING WITH A VEHICLE THAT IS LESS THAN 10 YEARS OLD. THE OIL COOLER LINES AND THE TRANSMISSION COOLER LINES HAVE ALL RUSTED THROUGH AND HAVE HAD TO BE REPLACED. ALONG WITH THE LINES, THE CONNECTORS FOR THE LINES HAVE ALL HAD TO BE REPLACED DUE TO CATASTROPHIC FAILURE (THEY RUSTED SO BAD THAT WERE FALLING APART). IF THE VEHICLE WAS 20 YEARS OLD I MIGHT EXPECT THIS PROBLEM, BUT NOT ON ONE LESS THAN 10 YEARS OLD AND THE MILEAGE THAT IT HAS. *TR

TRANSMISSION DOES NOT PERFORM CORRECTLY. TRANSMISSION DOES NOT ENGAGE CORRECTLY. MOST RECENT OCCURRENCE TRANSMISSION SHIFTED TO NEUTRAL WHILE BEING OPERATED AND WOULD NOT GO BACK INTO GEAR. TRANSMISSION FINALLY SHIFTED TO FIRST GEAR, BUT WOULD NOT CHANGE TO ANOTHER GEAR. THERE HAVE BEEN SOFTWARE UPGRADES TO THIS TRANSMISSION, BUT THAT IS NOT CONSIDERED A REPAIR FOR GM. GM SAYS THERE IS NOTHING THEY CAN DO BECAUSE IT IS NOT UNDER WARRANTY ANYMORE, BUT PROBLEM STARTED BEFORE VEHICLE WAS OUT OF WARRANTY. VEHICLE HAS BEEN TAKEN TO A DEALERSHIP FOR CONCERNS MULTIPLE TIMES, BUT NOTHING WAS REPAIRED. IT WAS STATED THAT WAS A COMMON PROBLEM FOR THAT YEAR OF VEHICLE. NOW THEY THINK THE PROBLEM IS PIN POINTED, BUT THE REPAIR COST WOULD BE CHARGED TO ME SINCE IT IS OUT OF WARRANTY. *JB

WHILE DRIVING AT ANY SPEED TRANSMISSION STUCK IN 2ND GEAR. DEALERSHIP REPAIRED THE TRANSMISSION. *AK

WHILE SHIFTING FROM PARK TO DRIVE A CLICKING NOISE WAS HEARD COMING FROM UNDERNEATH THE VEHICLE. WHILE DRIVING,THE DRIVER EXPERIENCING A FLUCTUATE IN SPEED. THIS CAUSE THE VEHICLE TO ACCELERATED INTERMITTENTLY. THE DRIVER WAS ABLE TO DRIVE THE VEHICLE TO THE DEALER FOR INSPECTION. THE MECHANIC INFORMED THE DRIVER FRONT AND REAR U JOINTS NEEDED REPLACING FROM THE DRIVE SHAFT. *MR *LA

GMC 2500HD WILL NOT STOP OR TURN SOMETIMES ,HYATT BUICK SAYS IT IS NORMAL . I HAVE A SIGNED LETTER THAT SAYS IT IS NORMAL.INCEDENT DATE IS FIRST TIME THIS HAPPENED. I NEED HELP-------