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I had this same issue on my 2017. Didn't show up till 10,000 miles. Mostly noticed the rumble while going a steady 70-73. It would come for a few seconds and then go away. On my 12 mile interstate drive it would happen maybe a dozen times. I did notice some slipping during acceleration but wasn't sure. They did the three flush and I'm suppose to bring it back after 200 miles. I was also skeptical about the flushing but it's way better. I notice it shifts much different now as well. They were able to see converter lockup issues while driving/scanning the car.
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