Does it sound mechanical or engine related (ping or knock?). The solution will be different based on that.
Hard to say anything else as "chatter" isn't specific enough (and clearly no one has had a similar situation given the replies to your posts on the topic).
It most likely isn't engine related (knock or ping) since you've had it to a Ford dealer and they would have fixed those pretty quickly.
It could be driveline noise as the chassis is lengthened and the driveshaft modified.
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