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I sure hope you don't need to pay for a new clutch. That job costs a fortune. Especially if you have Z51.
I'd be very concerned with clutch chatter at 12k miles. If it is the clutch I hope it is a defect and not due to the original owner beating the snot out of it.
I'd try another dealer for sure. Just keep in mind that a clutch, like brakes, are wear items and not typically covered under warranty unless there is a defect.
My dealer told me 7,500 miles for wear items. I think since you bought the car preowned, I'd press them to fix it as a "good faith repair". Usually they'll do those once for a customer. Good luck.
I had a failed burnout once when I was roasting off the last bit of tread on my original tires. Uneven surface or something caused only one wheel to spin. I could definitely smell clutch for a little while after that and got back chatter in 1st gear. I drove it gently and took it very easy on the clutch and after maybe 2 weeks, it went back to normal and felt good. Could be something similar to what you are experiencing.
Yup, same issue. Had it to the dealer, they replaced the flywheel. Still chatters in first. Also had a problem with the pedal sticking a few inches and they replaced the master and slave cylinders which has made it much better but still not completely fixed. I am going to drive it for a while and see what happens. I test drove a few others and they did not do this. It really hurts the driving experience.