Since my current rig is a 3/4 Chevy with and IFS, there is no real flex there, had to drag out pictures of my old XJ I sold a year and a half ago, I sure do miss it, but there were bills to pay.
Saw at this thread (again); flex is not really my thing... but this time, it was just after a reading an article on FourWheeler that truly puts "flex" in context. So while this is not my Ford, it gets my vote: Yes, it appears to be stock.