I ordered a 2023 back in December, I got a call on Thursday June 15th the sales manager said he had an Allocation for a 2024 LT Trailboss he wanted to go over my order to make sure everything was right.
when he hit submit it was accepted just waiting on a TPW. I think they start production for the 24s July 17th.. This is what he sent me. Orders for the 2024 Chevrolet Silverado 1500 can be made today.
The first dealer orders will be placed on 6/15/2024. Orders for the 2023 1500 will officially close on 6/1/2023
so, any order after that will be placed as a 2024 model.
Hope this information helps.