2003 Expedition 4.6L Vibration

[714slugger]

Hi guys i am having a terrible vibration when accelerating say i accelerate from a stop it vibrates when going into the next gear it only does it sometimes im not sure if it is bad U-joints or what any help would be really appreciated

 

[toms89]

Hi guys i am having a terrible vibration when accelerating say i accelerate from a stop it vibrates when going into the next gear it only does it sometimes im not sure if it is bad U-joints or what any help would be really appreciated

Heavy throttle, light or both? All gears or just first to second?

 

[toms89]

Possible misfire, slipping 2nd gear band or bad U-joint would be my guess based on your first post.

 

[714slugger]

Ive noticed its more under a heavy throttle but does do it on a light throttle to and majority of the time its from 1st to 2nd all other gears are really smooth my buddy owns a 2012 range rover sport and says it shifts smoother than his luxury truck LOL i have the u-joint but haven't had time to install hopefully its nothing big

 

[rburch]

Sounds like torque converter shudder to me. I have heard but never tried it but people say that you can add ford friction modifier to the tranny and it will fix it.

 

[toms89]

Sounds like torque converter shudder to me. I have heard but never tried it but people say that you can add ford friction modifier to the tranny and it will fix it.

I believe torque converter shudder is typically associated with light throttle and the upper gears. Converter having issues locking up smoothly under load....

But I admit.... auto trannys are not my area.