Trans Fail safe mode

[PhazeX5]

Hey all,
I know this has been a topic in the forums, but I'm having this issue with the dealer right now and I need some advice. In the morning the truck drives fine, it seems when it warms up this starts happening, the truck drives perfect on the highway at regular speeds, when I slow down to make turns the X seems like it wouldnt go into gear but after it does, it drives fine again. When at a complete stop, it goes into gears fine. I took the X (2000 4.4i) to the dealer last friday because I kept getting the trans fail safe mode on my cluster every now and then and plus the slugish trans. I explained to the SA what was happening. Later on on the day he calls and tells me I have 2 Cam sensors that are bad and they need to be replaced ($449) I asked, is this the problem and he replied yes this will fix the problem. Ok...Later on he calls back and says four O2 sensors are bad ($1356.00) and My trans fluid is kinda a low ( about 1.5 liters) And they need to add to it to level it out ( $31.00/liter plus labor). I also Aksed is this the final reason why the truck is acting up, and he again replied yes. He also said That he recommend changing my spark plugs so I agreed. Im now some where around $2500. The best part of this story.........this afternoon he calls me and says he has bad news, it seems that the ST drove the X and the problem still consists. He now says that I have to replace my transmisson ($6400). WTF is going on with this dealer?? I just took the truck in for that specific problem and I told him thats all I wanted fixed, nothing else, now Im going to be somewhere around $9000. I was so pissed off that I told him, he needs to check out the truck again that I am not paying for a new trans, after telling me it was something else, if thats the case I wouldnt have fixed anything! $9000 is a down payment for a new car....he must be krazy. I'm waitng for him to call me back once again, after that I'm asking to speak to the manager. Anyone with similar problems? Is it my trans? Any advise?