Same situation here. Got a 18 with 67k took it to the dealer here in Texas. They said transmission is in back order and they have no clue when they gonna have it. I asked if they could get me a loaner and they don’t have one. I asked if I could have my truck back and they said if I take the truck they would have to open another claim and the one I have would be lost. Crappy! I love my GMC truck but I don’t think I’ll have it anymore.