I have been working with my dealer and Ford on this. From what I'm told, mine didn't have the pcm update for the cam phaser rattle; 21n08 applies to trucks that have had this cam phaser update. Please keep me posted on yours.
I have exactly the same thing with 2019 Screw 3.5. Driving me nuts...My dealer is useless...2019 Supercrew 3.5 Ecoboost with the 10 speed transmission and 28k miles. I have a shudder that I believe is torque converter or driveline/transmission related. There are several symptoms that I don't know if they're related.
The main shudder is under light acceleration, primarily in 10th gear about 45-47mph, especially if there is a slight incline and you increase the throttle. It'll continue to shudder up to about 55mph. It'll also do it on a slight incline in 7th gear around 30mph almost as noticeably. Primary feedback seems to be through the wheel but I've also ridden in the truck as a passenger and can still easily notice it. Time of year doesn't seem to have any effect and I replaced plugs gapped at .028 also to no avail. I don't believe it is driveshaft related because it stops completely by downshifting or by accelerating more aggressively through these speeds. This is by no means something I would consider violent though, just a light shudder of the entire vehicle. I really don't think it's tire related.
Similar feeling that isn't as easy to replicate is taking off normally from a stoplight I feel a slight shudder like previously described right after one of the gear changes but I can't nail down which one exactly, 6th maybe? Feels like it could be when the torque converter locks up.
The final symptom is not much of an issue now in the summer but when I leave work when the truck has sat cold all day around 10-20 degrees I'll be leaving nice and easy to let everything warm up and it has skipped from 1st to 4th with a very noticeable delay followed by a hard shift into gear (people behind me wondering why I'm not accelerating faster type of thing). This has only happened a few times in the two winters I've owned the truck. When the temperatures are warmer in the 60-70s type thing it has also done a slow hesitation shift after sitting for a few hours but not near as bad. Both of these cases are the first, maybe second time shifting through the gears after startup.
Seems to me all of these things could be torque converter but I don't know for sure. Need warranty work done so I'll likely be heading to the dealer in the next few weeks but looking for some advice ahead of time.
I may start to get somewhat off topic here but I've also wished for somewhat of a different setup to drive modes. I view the drive modes along the lines of 'I'm going to change to this drive mode for an isolated case I'm having now' i.e. tow haul mode for my trailer or its snowing so I'll use slippery. By the same logic I follow there, my sport mode is to pass that person, have some fun, etc. I think first on my list is remembering the mode. It bothers me that it defaults out of tow haul after a restart, the TBC/computer remembers but it won't stay in tow/haul? The same for sport mode if that's the mode you most prefer to use.Excellent update post. Thanks
I just wish that Ford would separate the shifting strategy between ECO and Normal by a wider margin.
Say... Half-way between Eco & "Sport".
Since Ford defaults the truck to Normal mode, it IS by far the most important mode to get right because human nature results in the vast majority of drivers just living in default.
I look at it completely different. (That's probably because of motorcycle technology that has for many more years offered various "modes" for the driver, and since motorcycles involve input from all four limbs, a motorcyclists is less likely to ignore all the options available) Ford intentionally provided me 5 or 6 shifting strategies. I assume they WANT me to be happy and they have covered the bases. If the default strategy was my favorite, then fine. But in my last 2 trucks with the 10r80 transmission, the default strategy is just not polished enough to be the preferred strategy.
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