I have a '01 Screw with the 5.4, it has developed a problem that is difficult for me to diagnose. While driving in overdrive the truck has an intermittent buck/shudder, that occurs when gradually accelerating (usually uphill). It doesn't seem to do it under hard acceleration or in other gears. I had the truck for over a year when I first noticed this problem about 30k miles at that time. Before it started I had the Tranny serviced @ Ford, supposedly they flushed and refilled the fluid including conditioner. At first I suspected an ignition problem, but have no check engine light or codes. So far I pulled all the coils and tested resistence, they test OK.
Any help or ideas anyone has about this problem is greatly appreciated.

 

Could this be the infamous "tranny shudder" that so many others have?

I had the same problem and dropped a bottle of "LubeGuard" into the tranny after I had a flush and fill.

It fixed mine for quite a while...and it's a cheap fix as well.

Good luck...

 

My problem got alot worse and I was able to verify that it is a missfire and not a tranny problem after all, thank god, I think. Now all I have to do is track down the cause and fix it, hopefully it holds a code soon.

 

I'm gald to hear you say that chesnut, because I had this problem for years and then had the fuel injectors professionally cleaned and it seems to have gone away. I couldn't figure out why fuel injectors would effect the transmission unless some sensors got cleaned as well.