Saint Mars

I just purchased a used 2017 Silverado last year. It currently has 86k miles on it and my transmission is slipping. I had it looked at and the shop told me I will need to get my transmission rebuilt. Among the many issues is a faulty torque converter. The mechanic said I shouldn't be having these issues with only 86k miles on my truck. These are issues of a truck with at least 140k miles on it. Will the dealership fix this?