So I tried searching for an answer to this with no luck. While driving home today, I had the windows down enjoying the nice weather (not the first time this year I've done this). While driving about 35-40mph, I notice a distinct clicking noise loud enough to be heard over the usual combined road/wind/radio sounds. I could hear it reflecting off buildings on both sides of the street as I was driving, and noticed that the clicking was speed dependent. It slowed when I did and stopped at around 20 mph them started again when I sped up until the wind was too loud to hear the clicking anymore. It seems related to vehicle speed and not engine speed, which makes me think it's something in the drivetrain between the transmission output and the ground.
My only other guess is maybe the fans if the air going through the radiator is spinning them slowly? Either way, as I said, today is the first time I heard the clicking and I highly doubt it's normal.
If anybody has any information about this please let me know before I have to go to the Ford garage and have them tell me they "couldn't replicate the problem" and it's "normal."
Thanks in advance.

 

Check your tires for a stone or maybe you up a screw or something like that.

 

Yeah my first guess would be rock in the treads

 

Your best bet is to put the rear up on jack stands...turn off traction control and run the vehicle up to speed in 2wd and see if the noise persists. This rules out the rock in tires theory and any possibility of iwe concerns or wind noise..I have a similar noise that I'm almost certain is coming from the transfer case towards the transmission that only goes away under 20 mph .it gets faster with speed and is loud enough for most people to recognize or hear...except when its at dealer...so it falls under "cannot reproduce " hopefully you figure yours out and find a fix..I know firsthand how frustrating it is.

 

No need for all that. My problem is that whenever I hear hoof beats, I tend to think "zebra" instead of "horse," and go looking for the complex problem instead of the simple one. As my grandpa always said, it's usually something stupid.
I checked all four tires and found two decent sized rocks (one in each of the driver's side tires), small enough to barely stick out above the tread but big enough they were firmly stuck in there and not getting tossed out at (legal) local road speed. Below 20mph, they weren't hitting the road hard/fast enough to be heard, but over that it was like smacking two rocks together- the faster I drove, the harder they hit more often, the louder and faster the clicking noise. Got the rocks out, took the truck around the block, no more clicking noise.
I feel dumb for not thinking of this on my own, but hopefully anyone else who has this problem can learn from my experience.

 

With the roads around here, I check for stones every week or so. Have a Leatherman Brewzer on my keychain that gets used for popping stones far more than popping beers. Perfect size to get in there.