Thank you sort of what I thought but wasn't really sure.

The few videos of driveshaft motion I have seen looks like they move just enough to take up the driveline slack. - and really that doesn't take much torque either. GM 8sp's did this too on occasion but not all the time - I suspect some related program logic. I could see where either a TSB that changes the software so the clutches flutter slower - would ease the sound level and maybe keep the pump off on first Key'd start - as opposed to when start stop enables.

 

My 2018 F150 does exactly what your does. I took mine to Kendell Ford in Wasilla AK and the mechanic was shocked to hear it. His words "that's a horrible noise". After a few minutes of trying to help, his service advisor came out to say its normal. Even the mechanic was dumbfounded. Ford knows darn well when a few of their vehicles make the clunk periodically, it's not normal. I don't know what to do. I have had nothing but problems with my new truck regarding the transmission shifting into 6th gear at 19 miles per hour and not able to climb a 2%grade up the driveway without having to manually shift gears. Each time I bring it in, they tell me the same things, either "its normal", or "don't worry, you have a great warranty". I have just retired 3 Chevy pickups at my business, but I don't think I'll be replacing them with Fords. I'm really sick about this because my wife warned me NOT to buy a Ford but I did it anyway.

 

I am NOT ok with this crap either! I need help because I am just sick of being screwed by these damn car dealers! 65k dollars for a peice of crap pickup with a horrible clunk and mine also shifts completely wrong! Shudders most of the time because it'll be in 6th or 7th gear at 20 mph! Have to stomp on the gas to make it down shift or manually down it to move.

 

Hopefully it won't fail 300 miles from nowhere in the Canadian highway system in February on your way to Haines AK for work at 39 below zero with absolutely no hope of a cellphone service. Which, by the way, has happened to me with my Ecodiesel dodge. I wish I now had it back because after 22 years of driving Dodge, I finally bought another Ford and wish I never did. When the idiot service advisor tells you not to worry about it because you have a great warranty, ask him how that helps in this scenario.

 

If there is nothing wrong with the truck, according to Ford, why give you a $3,000.00 warranty extension? I think that's what their price is.

 

If that's the case, I would assume Ford would tell us that. So far from what I gather and my own experience, the service people have no idea what so ever what it is, they only say its normal.

 

It's the driveline play folks. My truck makes it randomly when I park in my flat garage and the tranny P pawl doesn't 'engage'. The parking brake doesn't directly affect that, but if you use the parking brake in N, and then shift to P on a flat surface, then you might hear the 'clunk', if the parking pawl wasn't 'locked' in the transmission. And by that I mean when you put the truck in P in a slight incline, and release the brakes slowly, allowing the truck to move an inch or two, until the driveline 'locks', stopping the truck. In that instance, it'd never clunk; try it.

Now, I've heard ONE truck clunk on a thread somewhere here (a while back) much harder than mine, which I wouldn't ignore either. Maybe the sloppy Ford tolerances stacked the wrong one; who knows. But most of the clunks are quite mild, like mine. And completely harmless. The issue is Ford didn't use dampers, to save a few cents I guess. But without them, basically all cars would make the noise randomly too, since the driveline HAS to have an amount of play, which anybody could verify on any car with the engine off, tranny in N, and moving the driveshaft by hand under the car. My bikes clunk WAY harder when shifting to 1st gear while stopped, and although cringe-inducing, it's harmless too.

I'm as **** as it gets, but it's important to distinguish (either from research, or mechanical knowledge) noises that although not refined, they're not detrimental to the engine, like the cam-phaser 'decelerating' ratcheting, or a mild driveline clunk. And more importantly, even if they could be detrimental in the long run, it makes no sense to me trying to get such a widespread 'problem' resolved before Ford acknowledges fixing it first, because you'd get equally 'bad' parts, plus the risk of messing something else up in the process. It's unfortunate public automakers (basically all) have made profits their #1 #2, #3 (and maybe more) priorities, but it's the way it is. They'll continue to cut costs in the most stupid ways, like critical engine parts thinking they can get away with it, so more than ever, we need to discern real problems from unrefined behavior, or risk going nuts. Ha ha. I had low expectations from my F-150, and that helped me appreciate it for what it is, and not get worked up for what it's not (refined). I'll probably buy my first ever extended warranty (since Ford is behind it), and just not bother with issues unless it's clear there's one, and it can be duplicated at will at a dealer, ensuring I won't be sent back. Good luck guys.

 

I have a 2018 F150 with 4500 miles. When I push start I hear a clunk coming from under vehicle. Does not happen every time. About every 6 or so starts. Any ideas? Starter? Flywheel? Appreciate any thoughts. Thanks in advance.

 

Yep, I've driven multiple with the 10-speed now and they all made the clunk randomly.
Definitely not something I'm going to worry about. I have a couple other sounds that are more worrisome. These trucks are noisy, they make all kinds of weird sounds.
Obviously if your clunk is more so a significantly loud bang that's a different story

 

I wish that were my only problem. As I stated a bit earlier, not only does my truck make that horrible noise, it also has a problem with the shifting. 7th or 6th gear at 20 mph. Shuddering of course, down shifting to 5 grand down hill NOT in tow mode. They say it's all normal. Well, sometimes they say its normal. Sometimes they say not to worry because I have a great warranty. I got taken bad. But I learned a lot about Ford. Never buy another one. And I usually buy 2 or sometimes 3 pickups a year. Depending on how much work we have. Toyota tundra seems like a good choice.