There is now a class action lawsuit covering all GM vehicles that were unfortunate enough to have these transmissions (8L45 + 8L90)
https://www.classaction.org/media/du...motors-inc.pdf
My car has had fluid flushed multiple times and TC replaced. It's performing ok now but still noticeable especially with the hard jerks in cold weather. Is the supposed Q1 fix real? Or is GM just trying to wait out the 5 years hoping everyone's warranties will expire?