Re: Think we purchased a lemon
I would suggest you check the fluid level when the transmission is mis-behaving. The CD4E holds some fluid in the valve body chamber when it gets up to normal operating temperature, but you likely have the 6F35, and I don't know if it does that. The deal is that the fluid expands when it heats, and can get too high in the sump, so they have a thermal valve that closes, trapping fluid to a specific level, when it then overflows and drains back. If the fluid were too low, it could be trapping some, and leaving the pan below recommended level.
Other than that, let Ford take a look.