This is my first time on this Forum.
I got a 2004 f-150 4x4 with the 5.4 in it. When i'm on the high way and the truck is down shifting from over drive to 3rd gear the truck vibrate a lot or when the gear pass from 3rd to overdrive.
Anybody can tell me what the problem is? The truck got only 16000km on it.

 

Sound like the "Shudder" fault.
If your under warrenty, let Ford deal with it, don't try to do anything unless.

 

Thank's for your reply but i got no idea what is shudder. Can you give more info?

Thank's again!