2003 GMC GMC Truck

LOUD CLUNK IN DRIVETRAIN WHEN TRANSMISSION UPSHIFTS 2-3 AND DOWNSHIFTS 3-2. VEHICLE IS 2003 GMC PICK-UP TRUCK 4X4. DEALER #1 REPLACED DRIVESHAFT. NO CHANGE. DEALER #2 DIAGNOSED THE CLUNK AS A MOMENTARY TORQUE REVERSAL OF THE OUTPUT SHAFT WHEN THE CLUTCH IS APPLIED AND THE 2-4 BAND RELEASED. SEE GM INFORMATION BULLETIN #01-07-30-042C (SEPT. 27, 2005) GM SAYS THIS IS NORMAL AND NO REPAIRS SHOULD BE ATTEMPTED. THIS CONSTANT CLUNKING IS NOT NORMAL AND IS AGGRAVATING TO THE DRIVER AND OWNER. A NEW VEHICLE SHOULD BE FREE OF MECHANICAL DEFECT AS THE WARRANTY STATES. THIS CONDITION MAY BE WORSE IN 4X4 VEHICLES DUE TO TOLERANCES IN THE TRANSFER CASE. GM WILL NOT RECTIFY THIS DEFECT WHILE UNDER ORIGINAL WARRANTY. IT IS THEIR DUTY TO SELL A DEFECT FREE VEHICLE. I HAVE DISCUSSED THIS PROBLEM WITH GM, BBB, A TRUCK DEALER AND A TRANSMISSION REPAIR SHOP. MY CONCLUSION IS THAT A REPROGRAMMING OF THE BANDS IN THE TRANSMISSION CASE WILL CORRECT THIS DEFECT. GM IS NOT WILLING TO MAKE THIS REMEDY AVAILABLE TO THE VEHICLE. MY EXPECTATION IS THAT THE VEHICLE SHOULD BE DEFECT FREE DURING WARRANTY PERIOD. THE STANDOFF! THE FEDERAL GOVERNMENT SHOULD PROTECT THE UNWITTING BUYER FROM THE FAILURES OF AUTO MAKERS TO WARRANT A DEFECT FREE PRODUCT AS THEY CLAIM WHEN THEY SELL THE PRODUCT. OTHERWISE, IT IS A GROSS MISREPRESENTATION OF A PROMISE AND FRAUD. *JB

I NOTICED SINCE I BOUGHT MY 2003 GMC ENVOY THAT THE MOTOR WOULD RACE IN THE AM UPON STARTING. I TOOK THIS AS NORMAL UNTIL THE RACING NEVER STOPPED ONE DAY. I TOOK IT TO MY LOCAL GM DEALER AND THEY INFORMED ME THE FAN CLUTCH HAD FAILED AND REPAIRED IT FOR OVER 700$. UPON RESEARCH LATER ON THIS PART I NOTICED PEOPLE SAYING THESE ARE FAILING AT A REGULAR BASIS. NOW, I'M NOT A MECHANIC, BUT I THINK HAD I NOT THE KNOWLEDGE I DO OF AUTOMOBILES, I WOULD HAVE CONTINUED TO DRIVE AND POSSIBLY COULD HAVE HAD A MAJOR ENGINE FAILURE OF SOME SORTS. THIS COULD HAVE RESULTED IN A SERIOUS INCIDENT ON THE ROADS. MY VEHICLE HAD ONLY 40,000 MILES ON IT. NOT MANY, CONSIDERING THE IMPORTANT OF OPERATION OF THIS PART. *NM

PURCHASED 2003 GMC SIERRA DENALI WITH THE 6.0L ENGINE. THE ACCELERATOR PEDAL CAN BE DEPRESSED PART WAY WITHOUT ANY CHANGE TO THE ENGINE RPMS, CAUSING THE DRIVER TO PRESS THE PEDAL EVEN FURTHER. THIS COULD BE DANGEROUS: A) DELAYED VEHICLE RESPONSE WHEN DEPRESSING GAS PEDAL, B) DRIVER DEPRESSING THE PEDAL TOO FAR CAUSING THE VEHICLE TO LURCH FORWARD. TOOK THE VEHICLE TO THE DEALER, RESPONSE WAS THAT THIS IS WITHIN SPECS. NOT ALL 2003 SIERRA DENALI'S ARE LIKE THIS, SOME HAVE IMMEDIATE RESPONSE WHEN DEPRESSING THE PEDAL. *NLM