I've only put a couple of thousand miles on the truck since my first flush. Before the flush. I put road master springs on(love them) drives like a caddy the shudder went away for a couple of years and when i programmed the truck it went away for a long time. I deprogrammed it and the problem started showing up so I could bring it in under warranty. It became constant and I tried programming. It didn't keep the shudder away for more than a month.
I have the same truck and it started the same way. It will get progressively worse until it's always happening during highway driving. I tried multiple upgrades to the truck and it seemed to get rid of the problem, but over time came back. The dealer did the flush under the powertrain warranty and finally i have a flawless truck.
16-NA-175 they updated the service bulletin in October. It says they will come out with a fix first quarter 2019. They flushed my transmission and replaced the fluid 12/2018. Fixed my shudder.
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