Bring it to the dealer tomorrow and leaving it overnight and returning in the morning to do the startup with a tech in the truck to experience the problem.
No. I get that noise as well. Still the truck barely moves. Wait a few seconds and it starts moving and a little jerky.
Never in my life would I think a transmission that seems to be slipping is ok. If it's not a problem I wish Ford would say so. Wouldn't the service people know by now on...