[Tutti57]

It might not be the popular judder issue but maybe a torque converter shudder. I'd describe it as surging while cruising and when applying a little throttle. The tach bounces too.

They are pretty good about throwing codes for belt slip but I've had two titans in the last two weeks (I know, not cvt) that surged awfully when warmed up with no codes and putting on like 50 miles of road testing. During normal tc lock up, there shouldn't be any variations in the engine and input shaft speeds unless it's slipping, which was the case for both of these trucks. I replaced the transmission in one last week which fixed it and the data showed a big change before and after, and the second one has the exact issue with a transmission going in next week if approved by the extended warranty company. I've never needed to look at it on a cvt, but the data is likely available if you have a scan tool that can communicate with the tcm.