XTS Forum- 2013-2019 Including XTS V-Sport
I have a 2014 XTS with 120k miles, 3.6 paired with a 6T70 trans.
I did spark plugs and a transmission fluid flush.
I have what feels like a shudder, in 5th and 6th gear under light acceleration.
I do not have cel or tcm code set.
I’ve narrowed it down to what I think is a TC lockup problem.