Wife's 13CTS was shuttering on sharp turns,, I called it bunny hop,, I googled it an there were several threads bout it,, see said you had to threaten ,, cuss,, fist fight with yur dealership to get anything done !! My dealership is Cable-Dahmer Buick GMC Cadillac on Noland rd in Independence Mo.. was not looking forward to the visit but Jaren,, service guy wanted to take car for drive an see what it was I was describing.. it did it as soon as we left the bldg.. he recognized it an seen it had done it 4-5 times just on the lot. Left it with them (drove away in new Cadillac loaner.. Jaren kept in contact with wife letting her know it needed repairs-- replaced sum clutches,, an changed out sum oil. I'm not a motorhead guessing frt end transmission fluid..got it back day after the 4th,, all is well. No noise .. no shutter ..no bunny hop .. no stress!!!! No charge. Was a Cadillac certified vehicle. Unbelievable,, was so happy an pleased with how it was all handled I can't say enough bout this. I had bought a new truck frm then in 14 an have had no issues ever with them. But was nervous bout this. After reading threads on computer bout dealerships not wanting to fix problem.. Just left dealership letting them know how much I appreciated the way they handled this. Not my style to drive up there an do it or to type all this in,, but dam sure wanted to let em know how I felt. Class act. Very easy!!!!!