Not so fast. I rode with a tech two weeks ago who tried to suggest that by putting different 22"s on my truck (despite the fact they are FACTORY OPTIONAL GM 22"s, dammit) I "altered my vehicle from the way it came from the factory." This guy was a complete jerk, and so if you were to run in a service manager like this guy, you could certainly have some problems.
I'm sure that they could say that any drivetrain or tranny issues were caused by the added weight of the wheel, that GM doesn't offer a 24" wheel for that very reason, blah blah blah. You just never know.
I would have said you'll have no problems three weeks ago, but since this last service visit, I'm not convinced that you won't have any problems.