On my previous post, I said that it did have a transmission filter. I was told this at the O'Reilly Auto Parts store. I finally brought it in to the dealer today to get the complete flush done. When I asked the service technician to change the tranny filter as well, he said it did NOT have a filter. Several hours later, I picked up my Expedition and the slipping and jerking seemed to have disappeared. I drove it for at least 10 miles, however, as I got closer to home, it seemed to jerk once when traveling 55mph. Can't say if it was my imagination or because I was going uphill? This was weird, but I hope it doesn't happen again.