I'm Neal and I am here to assist you. Only accept when you are happy with my assistance. If I can't help I will open your Question to other experts.
I think what you are hearing is cold piston slap which is due to the engine design using a piston that is short and has the pin high up in the piston which allows some rocking, especially when cold. They do use a moly coating on the piston skirts to reduce this, but it is still going to occur to some extent.
How cold is it when you are noticing this?
I'm sorry I misread your question as far as being in gear. The only other thing I have been running into is exhaust manifold leaks. But it ddoes not sound like this is your issue.
Can you describe the noise anymore or can you tell the area it is coming from?
I have contacted Chrysler and they are contacting the dealer. They aren't really happy that the dealer didn't exercise their proceedures and contact them for help in resolving this instead of the answer "We have another one doing the same thing, must be normal" Thanks for the help.