I have a 2013 Subaru Impreza with a continuously variable transmission with ~40k miles on it. About two months ago I blew out the front right tire and took it to a tire shop. The folks at the tire shop said the tire wasn't repairable and that I had to replace two tires. The put the new tires on the back and moved the undamaged, but worn tires on the front. I can't remember if the worn tires were 60% worn or 40% worn, but they were the stock tires that I bought the car with.
About a month ago (and maybe 2k miles after replacing the tires) I started hearing a humming/clicking noise from the car (though no indicator lights went off). I took it to a shop and they told me that the noise was coming from the transmission and that I had to take it to the dealership. The dealer told me that the transmission was shot due to the diameter difference between the worn front tires and the new rear tires. Apparently the front tires are 4/32 thread and the rear are 10/32. The dealer claims that the warranty (which covers the powertrain to 60k miles) is void because the tread difference was responsible for the error. According to the dealer any tire shop should have seen the difference in tread and either changed all 4 tires or shaved the new tires down. The dealership wants ~$10k to replace the transmission.
I know nothing about this stuff and have spent several hours reading through conflicting information trying to figure out whether the tread difference could shoot the transmission. Based on some similar questions on this forum it sounds like the differential might be damaged as a result of something like this, but I have yet to see anything definitive about the transmission. Assuming that the tread difference was indeed responsible for the transmission damage (and assuming that the transmission is really totally damaged) is it reasonable to ask the tire shop to help pay the 10k?