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My son has a 2014 CTS with the AISIN TL-80SN 8-speed transmission, and he has been giving me a hard time about the 8-speed transmission having a clunk and being rough and it seems to search. I was down to see him in Florida in September and he was unable to replicate the noise, but his complaints continue, he is unhappy. Supposedly the dealer replaced his transmission but he STILL has the problem, VERY ODD indeed. I searched and found that many had complained about the 8 speed clunking and one member said "the original transmission with the clunk has been decommissioned". I wonder if it is possible for the dealer to have replaced my son's transmission with a tranny that was BEFORE the decommission and the problem persists? Has anyone heard of this? Are there any GM service bulletins? Me being a Cadillac lover, this makes me sick and I have become the lightning rod by my son, because of this. I NEED to get this fixed. My guess is that the dealer replaced this tranny with a unit with the same problem. My son bought the car used, how can I guarantee that his transmission WAS in fact replaced and that they are NOT stringing him along, not that I don't trust GM, but I have seen the dealers do some shady stuff. Is a call to the regional rep the way to go? I loved the car and felt very safe in it in spite of my son driving it aggressively with me in it on Florida 95. Thanks, Mike