Does this sound like a low or upper end knock?
Does it sound harsh or like keys jingling kind of subtle?
How many miles?
Have you checked the oil and do you have good oil pressure while running and during startup?
Hello I'm Chris a Ford Employee and Certified Engine/Transmission Specialist.
Thanks for asking your question. I am eager to get your vehicle back up and running correct, I am here to help you out for a small fee far less than a dealership and easier on the wallet, so if this information is of aid PLEASE PRESS ACCEPT and help me out financially by paying the small fee (which you selected). Please reply if further discussion is needed.