2015 Gmc 6.2 a8, rpm surge or shuttering

[allgonoshow2]

I folks, I am a hobbyist tuner, not a pro.
The above truck [mine]has the mentioned tranny issues.
It surges rpm about 150-200 rpm on steady throttle driving.

Worst, it has a noticeable shutter, the whole truck shakes at steady speed, light load driving, in high gear, this shutter lasts 2-3 seconds and with cycles every
few minutes if the steady speed/load is maintained.

I would have looked at TCC Duty Cycle to fix that, I could be wrong, but that doesn't seem to exist in 2.25 or3.0.

Any advice?

[Lakegoat]

Isn't that still under warranty? Get the dealer to fix it before you try and tune it. They can tell if you have been screwing with it.

[allgonoshow2]

Isn't that still under warranty? Get the dealer to fix it before you try and tune it. They can tell if you have been screwing with it.

It's already tuned.
These are known issues on several truck forums and the dealer hasn't got a fix yet, best of my knowledge,
I believe A8 Vettes have some of the same issues.

[Joshtuning]

Post a log make sure to log transmission slippage and tcc slip

[allgonoshow2]

Post a log make sure to log transmission slippage and tcc slip

Try this, kinda long but symptoms captured.
RPM cycles about 50-100 up-down.
Whole truck shakes on the up cycle.

I am assuming it is the torque convertor.

[Joshtuning]

Try this, kinda long but symptoms captured.
RPM cycles about 50-100 up-down.
Whole truck shakes on the up cycle.

I am assuming it is the torque convertor.

I'll take a look at it as soon as I get home I've heard a lot of the converters have been giving out

[allgonoshow2]

Ok, thanx.
I put the stock tune in after the log and it does the same thing, needs to be fully warmed up though on both tunes before it shutters.
Only tranny things changed in the tune are wot shift speed and wot shift rpm

[allgonoshow2]

Josh must be busy,
any one care to offer some input???