Sounds very similar to what happen to me but on an ‘18 at 5500 miles. Ford authorized a new transmission after a few other attempted fixes first, protocol I am sure. Seems much better then original and all good at least at 6500 miles now. Took 48 days in my case but dealer moved at a snails pace.15K miles and the tranny went. Busted the Sprag and the dealership has the tranny pulled apart now looking further into it. Always had a funky shift to it since new, especially 3-4 and 4-5. It started shifting hard from 7-8, 9-10 then had two very hard shifts with loud clunks from 1-2. The second time I was in 4A and it shifted 1-2 hard, ****** the truck around, the engine revved up, shifted into 4th with a loud bang. I slightly applied gas and it revved up hard, slammed into a higher gear and slammed back out of it going into a lower gear that made the engine rev up again. Pulled to the side of the highway and the ass end locked up. It went on the wrecker dragging its ass like a dog with worms. Service got it to drive in 4 low, but I have a feeling it will be in the shop for a while.
Sent from my iPad using Tapatalk