10spd / torque converter issues? 20 AT4

[ajs800]

I am approaching 15k miles on my '20 Sierra AT4 and over the last few thousand miles have noticed a slipping type feel while under load.  It may not be tranny related and more torque converter but between 60-75mph under soft load it tends to  jump and has a pretty noticeable slipping feel.  I know the 10spd is known to be solid (thus far) but any other common driveline issues with these trucks?  I never seem to have luck leaving it in dealers hands without guidance but I might be forced to at this point as I am not finding any common or well known problems when researching.  

[black00ta]

There is a TSB for twisted up rubber transmission cooler line from the factory. You'll have to get under the truck and remove the plastic to see. if you find that the line is twisted, replace it.