My 17 sierra gave me fits after changing the fluid filters and temp sensor it actually smoothed out after being told by multiple source the tranny was shot and ready to blow up. However it started developing fuel issues after that and I traded it in for a ford this past weekend. Feels good to have a truck with no issues for once. At this point it be a cold day in hell before I buy another GM. We shall see how the ford does. I know a lot of people with the 16’/17’ that had a lot of tranny issues but also newer models as well.