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Inform the dealership of this again or seek out another dealership in your area. You can even ask other shops if they are Ford sponsored that are non Ford dealers and they can honor warranties. Then you can get another opinion on it. They would be the ones to show the video to.
On the noise, does it sound like the tapping is coming from under you?
Does the shaking feel like it is in your back like it is the whole truck?
If so, tell the dealer to look at the U-joints on the truck and to check the factory tightening of the u-bolts for the rear axle. We had 7 come bac last week and every one had loose u-bolts for the rear axle. Each one complained of the same thing and you might be one of them. Every one is a new 2016 F250 or F350 that we had to do it to. Our shop is now tightening them up on the presale inspections as soon as they roll off the semi trucks.
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