Just purchased a 2016 Expedition XLT w/25000 miles. This is a beautiful truck. One owner , never a rental, not a scratch. I purchased it from a dealer 700 miles from my home. Long irrelevant story here....Anyway, the vehicle is still under original factory warranty. My problem is the transmission- 3rd gear specifically. Upon cold startup, the trans shifts as it should , into 3rd gear and pulls into 4th. Behaves exactly as it should and will go through the gears properly 2-3 times until it warms up even just a little bit. THEN, it will shift normally into third but almost immediately the rpms will drop and it "feels" like it went into 4th but it didn't. It seems to find a 3rd gear "high" This will occur under light and full load-- it doesn't matter. i've taken it to a local dealer and they say it's performing properly. I call BS. They say it doesn't produce a code but I don't accept that as an actual answer. Computers are not infallible. The whole driving experience is garbage in my mind. Still, I want to be reasonable. ( the dealer still has the vehicle and I haven't picked it up yet). There is no way this can be considered "normal" regardless of what the computer says. It feels like a torque converter that's lost pressure and slipping but it's only in 3rd gear. Extremely consistent behavior. NEVER happening in another gear. My 2011 F-150 with 6 speed auto and 175,000 trouble free miles shifts BETTER! I am hoping an experienced tech will see this and offer some guidance. I feel like my next move is to try to get a Ford Engineer on site to check this out. I'm discouraged and looking for help. THANKS!