2019 Sierra AT4 5.3 10 speed "chuggle"

[Dave78]

Hi everyone, I have a 2019 sierra at4 5.3 with the 10 speed tranny.  Currently has about 94000km on it (I'm in canada so km not miles).  Couple months ago it started shuddering.  Mostly a med to high speed when under slight load, like up a slight incline.  Is gotten worse over time, and at its worst I can see the engine rpm oscillating by about 100rpm.  Almost feels like it's hunting between 2 gears.  

Anyway, took it to the dealer today, and they said there's a bulletin to flush the tranny.  Seems sketchy to me.  Especially when my powertrain warranty is over in 6000km.   Anyone experience the same or have any thoughts?

[Steve-2019]

Deleted

Edited September 1, 2023 by Steve-2019
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[silveradosid]

i would let them do the flush, that way it is documented that you have a problem. then when your warranty is up you can still go after gm if there is still a problem

[Silverado4x4]

22 hours ago, Dave78 said:

Hi everyone, I have a 2019 sierra at4 5.3 with the 10 speed tranny.  Currently has about 94000km on it (I'm in canada so km not miles).  Couple months ago it started shuddering.  Mostly a med to high speed when under slight load, like up a slight incline.  Is gotten worse over time, and at its worst I can see the engine rpm oscillating by about 100rpm.  Almost feels like it's hunting between 2 gears.  

Anyway, took it to the dealer today, and they said there's a bulletin to flush the tranny.  Seems sketchy to me.  Especially when my powertrain warranty is over in 6000km.   Anyone experience the same or have any thoughts?

If you never had the TSB done to replace the transmission fluid to the updated fluid have it done the old fluid was absorbing moisture and causing the torque converter to slip causing your problem, I had the same problem as you and I had the TSB done to the new fluid and the problem was gone.

[Dave78]

Awesome, thanks.  Had the flush done and the symptoms are definitely improved.   Can tell if the remaining issue is just in my head or actually there.  Will have to drive for a while to know for sure.