2018 CT6 8 speed transmission problems

General Motors had significant issues with the 8-spd transmissions installed in Corvettes and Camaro vehicles. A friend of mine recently bough a 2015 Corvette 8-spd (7K miles) and his car started “shuddering” from the transmission. He found there is a class action lawsuit from issues with this transmission. Records showed his car had the torque converter replaced in 2016 trying to correct the problem. Since then GM has found it was the fluid causing the problem as it seemed to have an affinity for attracting moisture. He had the dealer flush the transmission 3 times and refill with the new fluid designed to correct this issue. He’s told me it seems perfect now, but this was a $600 repair.

I have a 2019 ct6 cadillac & I feel like my transmission jumps also. The dealership said nothing was wrong with it. Also the auto start & stop system should be smooth. It makes my car jump hard when it starts back up.

I had fluid changed. Still sometimes rough shift 1 to 2.

I paid almost $90,000 for my 2018 Cadillac CT6 PLATINUM off the showroom floor. Before it reached 15,000 miles it was having shuddering with the transmission. Initially,they tried to say it was normal, but finally admitted there was a problem. Changed transmission fluid x 3. Each time it worked about 1 week then the shudder returned. Research shows Cadillac knew these transmissions were faulty but still approved 800,000 to be installed in vehicles. I only have 28,000 miles currently and the shuddering happens continuously. It’s so irritating to pay that much for a vehicle to end up with constant transmission problems. I still have 1 year left on the powertrain warranty. Does anyone know of any Class Action Lawsuits going for this issue? Or does anyone have any suggestions on what I can do or say to the Cadillac service that would make them replace this piece of crap transmission?