Another Transmission Problem

[2001_Exploder]

Don't get me wrong, I'm a Ford guy but they are known for their transmissions being their weak spots.

Well, I think I'm gonna be having more serious problems here soon if I don't get this resolved. My trans is starting to shift a little funky as in, if I goose it and it kicks down to passing gear and I let off again, it's go through 3rd and then it's starts to shift again but it's like it gets stuck because I'll go to start accelerating and it jumps into a gear. Then it's fine. But it's done that for a while now, if I just stay on the gas even a slight bit while it comes back down to normal RPM it shifts fine.

Now, say I'm driving down the street and actually decide to slow for a speed bump, I'll brake and then after I go over the bump I'll go to accelerate and it's like it was in between gears and it jumps into gear because while I was braking it wasn't in any gear, like it tried down shifting but didn't actually accomplish the task. Does anyone have a slight idea what this is? I have a few ideas that come to mind but I maybe wrong. I just had the trans serviced and it actually was acting better but not now. The problem is, they overfilled it by quite a bit, could this be causing slow shifts or causing it to get stuck like this?

I'm a bit worried about this so any help is greatly appreciated.

 

[BrooklynBay]

Did they use Mercon V when they replaced the fluid? Do you know if they replaced the filter or just flushed the system? They don't usually replace the filter when they flush unless they drop the pan.