I'm in the middle of trying to diagnose the same issue with my 07. Actually had he pleasure of having it happen with tech driving the truck with laptop connected. Apparently on my truck the trans is in 3rd at very low speed and then decides to go to first and therefore the rather harsh shift(I too looked for the guy that hit me the first time it happened). My tech talked to Ford about how to resolve this, and they said to try driving and manually shifting the trans down to make sure that it engine brakes all the way down, and then they're going to check some pressures. He also said that 2nd gear is some how tied in(he knew, I just can't remember the exact conversation) with the overdrive, so it is not used on downshifts(that was from Ford). Anyway, that's all I can add, I'm going to do the manual shift, which I think should engine brake the truck(engine brake may not be the right term, please don't hang me) and take it from there. I mentioned the battery thing to him and he said that he thought the trans relearned itself every 5th cycle. I may of misunderstood him on that, but I'll try it anyway.