Chevrolet Silverado transmission problems

VEHICLE IS EXPERIENCING A LOUD CLUNCKING NOISE WHEN TURNING A CORNER AND ACCELERATING AT THE SAME TIME. ALSO, VEHICLE IS NOT DOWNSHIFTING TO PROPER GEAR ,CAUSING A VIBRATION THROUGHOUT VEHICLE WHEN DRIVING AT SPEEDS BETWEEN 35-45 MPH. WHEN CHANGING TO ANY GEAR FROM PARK POSITION, VEHICLE WILL JERK. MANUFACTURER HAS ACKNOWLEDGED DEFECT, BUT CANNOT FIX IT. CAUSE IS UNKNOWN. *AK

ONSUMER IS NOT SATISFIED WITH THIS VEHICLE. DEALERSHIP HAD VEHICLE FOR THIRTY DAYS OVER TWO MONTH PERIOD. CONSUMER HEARD A GRINDING NOISE UNDERNEATH THE HOOD . FRONT FOUR WHEEL DRIVE DIFFERENTIAL WAS REPLACED. ALSO, STEERING WHEEL HAD A LOT OF PLAY, AND WAS REPLACED WITH UPPER AND LOWER SHAFT/ TRANSMISSION WOULDN'T SHIFT INTO SECOND AND THIRD GEARS. DEALERSHIP REPROGRAMED PCM, AND THE TRANSMISSION STILL DOESN'T OPERATE AT ALL. THE BACK WINDOW FLEW OPEN FROM THE THIRD DOOR. *AK

THE AUTOMATIC TRANSMISSION INTERMITTENTLY FAILS TO ENGAGE ON LAUNCH. THERE IS A DELAY OF 1 TO 2 SECONDS BEFORE THE TRANSMISSION ENGAGES AND THE VEHICLE MOVES. THE FAILED CONDITION APPEARS AS IF THE VEHICLE IS IN NUETRAL AND THEN SLAMS INTO GEAR. THE FAILED CONDITION MAY BE THAT THE VEHICLE IS ACTUALLY TRYING TO LAUNCH IN 3RD AND THEN DOWN SHIFTS AFTER A DELAY. THIS IS A POTENTIALY DANGEROUS CONDITION THAT COULD RESULT IN AN ACCIDENT WHILE CROSSING TRAFFIC OR ENTERING TRAFFIC. I HAVE FOUND VIA THE INTERNET THAT MANY OWNERS OF THIS VEHICLE ARE HAVING THIS PROBLEM WITH BOTH 1999 AND 2000 MODELS. THIS PROBLEM IS VERY INTERMITTENT AND CAN NOT BE REPRODUCED WITH REGULARITY. BECAUSE THE PROBLEM CAN NOT BE REPRODUCED I HAVE NOT TAKEN THE VEHICLE TO THE DEALER, IT WOULD BE A WASTE OF TIME AT THIS POINT. THE DEALER WILL NOT BE ABLE TO REPRODUCE THE FAILURE. I HAVE EXPERIENCED THE PROBLEM 3 TIMES IN 3 MONTHS AND 3000 MILES. IT IS IMPOSSIBLE FOR VEHICLE OWNERS TO GET GM TO DO ANYTHING BECAUSE THE PROBLEM IS SO INTERMITTENT. GM HAS TO BE AWARE OF THE PROBLEM FROM WHAT I HAVE SEEN ON THE INTERNET. PLEASE LET ME KNOW IF I CAN HELP IN ANY WAY WITH YOUR INVESTIGATION. THANK YOU IN ADVANCE FOR YOUR HELP.

THIS VEHICLE HAS BEEN A NIGHTMARE. THE BRAKES HAVE FAILED, THE STEERING COLUMN HAS GONE OUT, I HAD TO REPLACE ALL THE TIRES AND GET A FRONT END ALIGNMENT, THE ALTERNATER WENT OUT, AND THE TRANSMISSION HAS NEVER WORKED CORRECTLY. IT CLANKS LOUDLY WHEN SHIFTING GEARS, DOESN'T IDLE CORRECTLY, AND SHUTS OFF. I HAVE HAD IT REBUILT ON THREE SEPARATE OCCASIONS. ON ONE OCCASION IT EVEN CAUGHT ON FIRE. THE TRANSMISSION IS BACK IN THE SHOP NOW. *AK( DOT NUMBER: TIRE SIZE: 16 INCH )