Is my transmission talking to me?

[Hey you]

Noticed that under a load, accelerating, at the higher gears... there is a stutter/jerk type of sensation that seems to get worse if I increase throttle.
But when at cruise speed, it runs smooth. If I accelerate at a slower rate, I do not notice it.
It has been doing this for a while now, but I thought it was the noise from the roads. Recently found some new roads, real smooth, and it still does it.
I have noticed very slight Rev changes, you have to look real close to catch them.
No check engine light, and no codes displayed on the portable scanner. Fluid levels are good.

Any ideas, thoughts etc...

Thanks in advance.

 

[B-train]

What year, model, engine, and trans (4, 6, or 8 speed)?

 

[PG01]

Say hello from me please

 

[Fless]

What year, model, engine, and trans (4, 6, or 8 speed)?

Miles?

 

[Hey you]

Sorry, should have put more info in the post. It is a 2015 Tahoe LT, just turned 130K, V8 and I think 5.3, auto matic 6 speed.
I also noticed the issue when manually shifting up thru the gears, but again with moderate acceleration.

 

[B-train]

I'm going with a torque converter that is getting bad. If it has the original setup, it's probably got the thermostat foe the trans cooler lines that cooks the transmission and causes failures.

@NickTransmissions

 

[NickTransmissions]

Sorry, should have put more info in the post. It is a 2015 Tahoe LT, just turned 130K, V8 and I think 5.3, auto matic 6 speed.
I also noticed the issue when manually shifting up thru the gears, but again with moderate acceleration.

Do you have a bi-directional scan tool?

 

[Hey you]

Not a bi directional, maybe I can get an auto parts store to check for codes?

 

[NickTransmissions]

Not a bi directional, maybe I can get an auto parts store to check for codes?

Nope, you need a bidirectional scan tool that's capable of rendering live powertrain and drivetrain data as well as perform adapt/resets.

Look into Snap On, Autel or Bosch and figure to spend around $400-$600 but it's well worth the investment - pays for ifself in one to two uses...

 

[Hey you]

Doing research on this transmission issue, stutter when accelerating. My Tahoe seems to run fine when the trans temp is reading low, that is below 130.
But as it heats up 180 and above, I notice the stutter is more pronounced. Max temp I have seen is 195, but it was probably much higher a few months ago
when I was towing a cargo trailer. At that time, I did not detect the stutter... I thought it was the usual slack of the trailer hitch noise.

So I am considering replacing the Trans temp bypass valve with an after market product. Currently looking at this...

PPE Transmission Fluid Thermal Bypass Valve(14-18 Tahoe w/ 6L80 Transmission)​

Also considering adding the magic sauce, Instant shudder fix additive to the existing fluid.

I could also replace the trans fluid with GM ACDelco 8L90 Transmission Service FILTER Kit Mobil 1 HP Fluid For Chevy GMC, although I think my tranny is
a 6L80 model. But since this is more complicated, I am favoring the first two options. Should the fluid change be required, I would also replace the filter
and gasket, and hope the pan can be removed without too much trouble.

Thoughts, Advice, Input.... all appreciated!