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About Abiker21

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  1. Get a copy of the service bulletin and ask your local guy how close he can get to accomplishing it. Early on GM didn't realize the importance of flushing the cooling lines and were chasing their tails when the problem showed back up soon after.... it must be a bad TC....
  2. If it feels like you're going over rumble sticks/ rpm flutter at constant speed. Look up torque converter shudder. There is a service bulletin that can be applied under your drivetrain warranty. I believe mine started the same way until it was a consistent failure on the highway. Don't change anything for a an other 10,000 miles or until it gets worse. The RPM flutter will get more pronounced and then you know it's the torque converter shudder.
  3. 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.
  4. 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.
  5. 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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