on my '19 ZR2 with the minimax, after reading some posts on here about how it might be a good idea to initially change the trans fluid early on, I think I might have the dealer change it soon. I currently have just over 26k on the truck. This dealer is really good at letting me supply the parts and fluids and they will use them, so I ordered an AC delco trans filter. I can get 1 gallon jugs of the AC Delco full synthetic Dex VI for like $1 more than the non-synthetic stuff. But first off, will 2 gallons be enough? And also, will the dealerships put in the synthetic fluid since it's the actual AC Delco Dex VI stuff?? I will also have them go ahead and change the rear diff fluid in case it's the factory fill. I read too many horror stories on here of how dirty the factory fluid was at low miles.