I have had this vibration for a few months now but it seems to be getting worse. At freeway speeds above 50mph under power with the torque converter unlocked the truck will downshift from 4th to 3rd with vibration. Does this sound like a transmission issue? Could it be drive line related? Bad u joint? It only does it at that exact scenario as I explained.

 

Mine is acting kind of like this around 35 and at OD

Yesturday and still it won't even shift into OD....

Had to barrow a car...

 

Yea, its got 87,000 miles on it. The local Tranny guy wants $2400 for an upgraded rebuild. I just took it over to Ford for a second opinion.

 

Goo... I lucked out mines under the 5 year 60,000 warranty!!

Didn't think it was at first but turns out after many of phone calls it in fact is!

GOOD LUCK

 

My '01 F150 w 90K on it does this. At highway speeds cruising when I hit an incline it stumbles to down shift. Upshift is fine. Just had the oil & filters changed and the TC oil changed too. After 1,000 miles its doing it again.
did anyone find a fix yet?
jon