2015 Yukon XL Denali Transmission Shudder

[Cthom]

I had the filter and fluid replaced by a shop i trust back in March 2023 the shudder went away had no problems what so ever. The filter was a OE filter and the fluid was Mobil One synthetic LV ATF HP (blue label on the bottle).
Last week i started to notice the shudder coming back once the vehicle is driven around awhile town driving 20-40MPH.
Any idea why it would return and what should be my next step. Yukon has about 160K miles

 

[NickTransmissions]

Sounds like converter is going out - if so I'd be shocked (sarcasm).

Replace it before it totally grenades and takes out your pump requiring a complete rebuild.

Diagnosis: plug in a bi directional scanner that will display live trans and tcc data and look for the TCC slip once its in lock up. If it's slipping (ie slip is greater than 1-5 rpm) that pos converter clutch is shot.