Grygor, I know that feeling, but it really is OK. I know that takes some believing, but it's true. I first encountered HDC on a Land Rover Discovery about ten years ago. When I first heard the very noises you are describing I thought, Jayzes, I've just blown the transfer box to hell and back! When I eased into the dealership at about twelve miles per hour the mechanic went out for a spin with me and said, "Yes? What am I supposed to be listening for?" "What the..! Waddya mean, 'What am I supposed to be listening for?!'" I thought he was taking the **** out of me.
I agree it takes a leap of faith to believe that that can possibly be normal. But it is!
Rocal