8 speed shudder update

[DTB]

Recently I was complaining of the notorious 45-60 low rpm vibration on my 16 Sierra 5.3/8 speed that feels like driving over the rumble strip. Yesterday the dealership did a fluid flush/swap/filter change and so far so good. Smooth sailing so far and no tachometer flutter. 

[B R A D]

I'm about 8k miles in after flush with no problems. The more miles I put on the better it feels

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[DTB]

Day 2 update. Still no vibration but I noticed a puddle under the truck and the lines are leaking that go from the cooler to the transmission. So now it’s back to the dealership. I’m so angry right now.