[derieu]

Set up a case with Chevy customer care using live chat: https://www.chevrolet.com/contact/chat

I had the same thing happen with my CPO 14 SS 1LE. My case was very frustrating and wonky, my diff blew up a day after I purchased the car, a ton of clutch issues, etc. Finally got 1 dealership to rip it apart and they determined that the pressure plate was cracked/warped from hard driving (I did not drive the car hard). They looked into it further, and they ended up checking the service records for when the CPO inspection occurred vs the delivery of my car. I took delivery 1000 miles after it was certified, meaning that either during test drives or dealership driving (workers taking the car home), it was damaged in the process.

TLDR: Keep complaining to chevy, explain that you are very displeased with the stock, unmodified CPO vehicle. Check the mileage it was certified at vs when you took delivery. I ended up getting an extended powertrain warranty + a free clutch and diff out of it. Best of luck.