I have a 2018 GMC Sierra. In the past couple of weeks I've started to notice a periodic shimmy, like I am on a rumble strip. The shifts aren't always smooth either. I checked on line, and I wish I hadn't.

Evidently this is a known issue for that particular transmission. There are a lot of angry customers and several class action suits. But you only see the bad stuff on line - maybe there are some success stories out there that we don't read about?

Has anyone on here had the same problem? Were you able to fix it permanently? I'm ready to sell it but I'm worried that's an over-reaction.