First post - just picked up a 2008 Jeep Grand Cherokee Limited 4.7 QD-II 81k miles in great shape. When accelerating I feel a slight shudder at around 40-45 mph and 60-65 that goes away when lifting the accelerator. No vibration when coasting at that speed or when the engine/transmission is cold. I am suspecting it is something to do with the torque converter locking (or failing to fully lock).
I've searched and found posts with similar symptoms but no resolutions noted. Dealer where I bought the car says it sounds normal (right) but I have an appointment next week for them to drive it and pull the codes if any.
Thoughts or suggestions?