Yes, I've had what I would consider very low traction situations. I posted 2 other videos here of some of those situations. In one video that was on more level ground, but with numerous big rocks (lots of underbody scrapping) and rock shelves. I got no warning messages.
The other video is a pretty steep hill with smaller, but still large, rocks and looser gravel. I constantly got the overheat message on this hill on the two times I went up it.
The steering wheel does seem tighter in 4lo (no 4lock in 5th gen). Do the 4th gens have "drive by wire steering"? 5th gen does not have any mechanical link to the steering rack and steering wheel and that makes it hard to tell by steering wheel feel.
I will say that in 4HI that if I let the truck move under its own power in a straight line (idle speed) and then turn the wheel full lock that the truck will stop on its own. This would be because of the extra friction from the front diff (100% clutch engagement). I think this is the strongest evidence that the 5th gen trucks do have 100% clutch engagement. Do the 4th gen trucks behave like this as well??? I can't duplicate this with 4Lo because all the extra TQ does not let the truck come to a stop.
I've only ever had the felt "grab and release" when I get the over heat message that then causes the truck to go in and out of 4wd constantly. If I don't get the message then it seems to be 100% 4wd all the time. Again, it could be doing it so fast with the new TC that I can't feel it.
If it's just so fast that I can't tell then that would still create a lot of unnecessary heat. Which I hope is the case because then the switch from Brandon should help with this. But only if the algorithm the truck uses to determine the overheating scenario takes into account the amount of time the clutches engage in a given period of time. If the truck doesn't take that into account then it doesn't matter and the truck will still think the TC is overheating and will throw it into 2wd mode.
@Brandon-w , your switch definitely allows 100% clutch engagement as shown in your vids, but do you know how the switch has effected the overheat warning? I don't think many people were getting the actual overheat warning to begin with and maybe they would still get that warning at the same rate as before the switch if the 4wd was worked hard enough before and after the switch. Meaning the requirements for the overheat algorithm are still met at the same rate no matter if they have the switch or not. Which would them put them into 2wd mode.