I Have a 2000 F150 Harley. i notice now that when i take off that my trans whines till it shifts into second.then it goes away. also once the truck is warmed up. When i stop and turn left or right i get a bad vibration for a sec or two. I have allready changed my rearend fluid and added the friction modifer. the only other thing i can maybe think it is my trans/??? I read a service bulliten a while ago and it said that there is a updated drive shaft and tail housing of the trans. output shaft bearing and seal. it says that over a period of time the bearing will walk it self out and you will feel a driveline vibration. has anyone heard of this. thanks