1998 explorer very bad shake after 55 mph and hit a bump

[dlevi2121]

I have a 1998 explorer something is not right in the front end if you run over 55 and hit a bump the front end will shake very violently it will scare you it shakes so bad it has new wheel bearins upper and lower ball joints cv shafts tie rods look great and it was just lined up if you keep it at 55 or less it is fine but I can not for the life of me figure it out why it does this any help is great thanks by the way it is a 1998 5.0 auto AWD