NHTSA Complaint #10732166 — 2014 CHEVROLET SILVERADO

I BEGAN TO NOTICE SEVERE VIBRATION IN THE DRIVE TRAIN AT 55 MPH, SIMILAR TO A WASHBOARD EFFECT. IN ADDITION, THE VEHICLE DOWN SHIFTED VERY HARD WHEN STOPPING. I REPORTED THIS PROBLEM TO THE DEALER ON THIS DATE AND THEY SAID IT WAS NORMAL OPERATION. IN DECEMBER, OF 2014, I TRIED PASSING A VEHICLE AND EXPERIENCED A LOUD THUMP IN THE REAR END OF THE VEHICLE, I THOUGHT THE DRIVE SHAFT WAS GOING TO FALL OUT. I TOOK THE VEHICLE TO THE DEALER AND THEY COULD NOT REPLICATE THE ISSUE. I HAVE TAKEN THE VEHICLE TO TWO DIFFERENT DEALERSHIPS A TOTAL OF 3 TIMES TO ADDRESS THIS ISSUE. THEY BOTH CLAIM THIS IS NORMAL. NOW THE VIBRATION HAS GOTTEN WORSE, IT CAN OCCUR AT 40-45, 50-55, AND 60 TO 65. I HAVE OWNED GM TRUCKS BEFORE AND THE ONLY TIME I HAD AN ISSUE LIKE THIS WAS WHEN THE DRIVE SHAFT ON A 1994 SAFARI VAN WAS OUT OF BALANCE HAD TO BE RE BALANCED. I HAVE NOTED SEVERAL OTHER COMPLAINTS FROM OTHER 2014 -15 VEHICLE OWNERS. THIS TYPE OF OPERATION HAS TO BE DAMAGING THE GEARS AND TRANSMISSION. I HAVE CALLED THE GM AREA REP AND GOT AN ATTITUDE FROM HIM. HOWEVER, I DO HAVE ANOTHER APPOINTMENT WITH THE SELLING DEALER, (3RD WITH HIM, 4TH OVER ALL) THIS WEEK. AND WAS TOLD TO CALL THE GM REP WHEN I ARRIVE.