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I have a 2015 Silverado high country. I bought it used with a certified warranty in October 2018. It's been in the shop at least a dozen times for transmission issues. They put a better trans fluid which helped some put a new remanufactured trans in. It still shifts hard and shudders.I know it's a bad torque converter but they won't fix or replace. The last thing they told me is that it is the characteristic of the truck in other words it's normal.