NHTSA Complaint #11640167 — 2016 GMC ACADIA

On about 01/20/2025 my transmission? Auto started to shudder before going into 3rd gear threw 5th. Once in 6th gear at about 55 the auto starts to shudder and turns into a rumble feeling. My auto only has 100650 for miles on it. It has been serviced and have brought it to GM 01/24/25 to ask about it? After talking to service adviser. It would cost me 75.00 for someone to go with me to confirm it is doing it. Then make an appointment for further evaluation. No price given at this time. but did not on paper! Say That it is most likely torque converter causing the problem? Confirmed It is not under warranty and there was nothing GM could do.i have been to at least 3 other shops in my area and they all say the same thing and price. Which is between 6 to 7 thousand dollars to replace the transmission. They all dosay that when it goes it could make me loose control Due to lockup.