I thought the same thing the first time I used 4H on the road in my 2016 Chev 2500HD 6.0. I asked the dealer shop about it and they said it was normal. It took a while to accept it as normal but I am used to it now and nothing has busted so I guess it is OK.
My Fords, Jeeps and Dodges sure didn't whine like that.
I also have a low speed rotational noise they either say is normal or that they can't hear it. The only time I notice it is in a quiet parking lot or, oddly enough, driving around the local dealer's lot to get to the service department. They can't hear it all the time though. I quit worrying about that one, too.
Other than that, I must say I am very pleased with this truck. I still comment to the GF every so often about how good of a truck we got. It is comfortable, plenty powerful, tows the boat really well, and looks pretty good. It also has a good stereo so I don't have to listen to the drivetrain noises!