It's been 3 weeks now since I had the trans flushed a d new fluid added in my 2016 Sierra 5.3 with the 8 speed trans. The shudder is still gone! Love it! I was out of warranty and had to pay out if pocket, the dealership which sold me the truck refused to do the flush for free. ( That's a long story, they pretty much hid the shudder from me). They wanted $700 to do the flush, I laughed. Went to the other local GM dealership in town and they charged me $350. I'll never go back to the other and am letting everyone else know as well how crooked they are. Sent from my LG-LS993 using Tapatalk