etlives

I appreciate the input and will mention it to the service people at the dealership at my next servicing.

No modifications. 5.0 engine. Previous vehicle was a '98 Explorer w/ 5.0 that never acted this way.

Hello, all! My first time here, so, I hope I'm posting in the right location. I have an issue with my transmission on my 2011 F150 truck. This is/was my first "new vehicle". I bought it as a leftover w/ 85 miles on it from a dealer in NEPA along w/ the "best" warranty Ford offers. For the first 5 months of driving, it drove/shifted like any other automatic trans. vehicle I have ever driven. Then, very suddenly, (I.E.; all was normal driving to location A. When I left location A a few hours later, things were not normal) it felt different. Like it was dragging or being restrained. My first thought was that the emergency brake was hung up. After a while, I determined that the transmission was shifting, noticeably, at certain speeds with no tork on the engine. This causes the truck to "engine brake" which is the dragging I felt. I took it to the dealer who pushed it off as, "the transmission adjusts to the persons driving habits". That would have been an acceptable answer, had it not been for the sudden change in its behaviour. They appeased me by hooking it up to the computer, which showed nothing wrong w/ it, and resetting the tranny to factory defaults. This did not solve the problem. Here's what it does...on a flat road, take it up to 50mph and take your foot off the gas. When the truck reaches 40-42mph it will downshift. You can see the tach jump a few hundred rpms which slows the truck faster. When it reaches 30-32 mph, it downshifts again, again the tach jumps and the truck slows down even more. This is not noticeable when you slow down quickly while breaking. However, when you do slow down enough to go around a turn or over a speed bump, the transmission will drop into first? gear and hang there, (foot off the gas peddle) reving the engine at 1500-2000rpms for up to several seconds before it upshifts to whatever normal gear it should be in. The dealership checked the tow/haul mode switch and again checked it on the computer. They still say nothing is wrong and seemed to get a bit annoyed when I told them that I've driven enough vehicles for a long enough time to NOT need a computer to tell me something isn't right. There is no shuddering or hard shifting. In fact, if it wasn't for the dropping into first gear when you slow to turn corners or the fact that the change happened so suddenly, I would have assumed the vehicle was supposed to drive that way. Has anyone else had any simillar behaviour from their trucks? Or, maybe, someone has some insight ast to what the problem might be?