Yep, it's a pretty crappy gearbox. Google "Getrag M32". I dumped the factory gear oil early on just because GM/Getrag apparently under fills these things leaving 6th. gear starving for oil. Sure enough, I only drained 2qts. Refilled it with 2.5 qts. of Redline MT-85. Didn't change shift quality (I really don't think you can much) but at least I have peace of mind that 6th gear is fed.. hopefully. Good luck with your dealer & car. Unfortunately, I think this is normal operation for this tranny.