I have a 2000 F150 5.4 triton. When I am accelerating or decelerating from 40 to 50 the front end shakes. At first I was thinking that it was the alignment but when i went to get that done they were saying that i needed new lower ball joints. I recently got them replaced but it continues to shake. Any suggestions?

 

possible tire out of balance? Maybe a wheel weight fell off. just a suggestion. Does it shake when you turn back and forth?