Have you been able to figure out why some Tahoes/Yukons that were built after ours have already been delivered? Mine was built on October 13th (second week of production) and some that require more chips than mine (Ultimate v. Premium package) have been delivered that were built after that.I got my email today and they said it’s 4300, but I know it 4d00 so go us lol. I bet your Yukon is parked right next to my Tahoe.