My rebuilt tranny (50k+ miles on it) on my 2012 Traverse with AWD just started to shudder again. Tried anti-shudder additives and is helping somewhat. Can I just switch over to the new Mobil 1 Synthetic LV ATF HP fluid the new Traverses are using even though it is not Dexos vi approved? My Aamco warranty is way over so not worried about that.