I have noticed it on mine as well. There is a thread for the 3.5 Eco with a video and it was diagnosed as the Cam Phasers. I would think its likely the same on the 5.0.

There is also a TSB for some kind of computer re-flash that may or may not correct the issue.

Drew, I have the exact same thing going on. I can say that my click/snap isn't always the same volume and I can actually manipulate it to make it happen.

If I accelerate then slowly let off, I can' barely hear it, or it's not doing it.

What I can do is get up to 20/30 mph and let off totally and it's loud, right on cue every time. I also can feel it, which feels like, under the front of the passenger footwell.

If I'm cruising along normally at 35 or 40 mph and give it a little gas and let off, I hear it again, every time.

I've been under the truck 4 times now and I can't find anything, plus it has to be moving. I can't just rev it in park and hear it.

Aside from that, everything else is great. I wouldn't discourage anyone from this powertrain.It's not the engine we're talking about it's the transmission.

It's the standard combo for the Platinum now.. I think Ford is plenty confident with this powertrain in basically their top of the line package.

We'll figure it out eventually and all will be fine..! It has been for 13 straight years, in 4 different trucks.

On a side note. I'm willing to bet if GM didn't have their hands in or around this 10 speed, there would be no issues.
Two friends, one with a 2014 Silverado and one with a 2016 Silverado. A total of 17 combined recalls with their transmissions.

This is a very accurate description of my truck too!

My father purchased a 2018 KR with the 5.0. Within just a few hundred miles, it was making a noise on start up from time to time. A couple visits to the dealer and they couldn't find anything wrong. He persisted and left it with the dealer until they found the problem. Lucky for him, the issue finally presented itself at the dealer. Turned out to be an issue with a timing chain, which actually broke while in the dealers possession. This ruined one of the cam phasers. Ford actually came good for a brand new engine and he was back on the road in a few days with no more issues. Great service, given that we assumed they would fight just to replace the lower end.

I purchased a 2018 Platinum with the 3.5 and have had zero issues so far. Funny, as I was the one that expected issues to arise if there was any between the two of our trucks. I couldn't help but go with the 3.5 after driving it and setting it up with the max tow package with locking 3..55's.

Whatever the annoyance is, it's not the engine..

These issues are not typical with the 5.0.

Exactly. Same thing for me. Glad to hear im not the only one.

I'm glad I'm not alone, but obviously wish we weren't dealing this noise.
Hopefully more will chime in, without the assumption it's just another thread of guy's hearing a slight knock..again & again.

I also know for a fact, it didn't start hearing it till roughly 600 miles or so into it.
I only have a 1050 miles now.
Might be time to attach the GoPro and see if I can find it.

Even though this is fairly loud when cold, I have tried to record this with my phone but it is not obvious on the recording. I wanted to capture this sound before talking to the dealer, since they are the kings of telling me what they can't do for me, instead of what they can do for me! I have even tried power braking the truck and it will not do it, as stated you must be moving, so to me this rules out the engine; it's trans or something in the drive line.