I have a 2000 f150/4x4/5.4 with 200k. I have just noticed a rattle that appears to be coming from the right front. It only occurs when I am accelarating from a stop. I have had the front hub/bearing assembly go out before and this does not sound like that. It only happens when the truck is in gear and moves. Everything underneith looks good and together. Any ideas?

 

Check the sway bar end link. Could also be a bad ball joint.

 

To restate, check your end-links and ball joints.

also check your shocks, read somewhere around here that the bushings fail in some way causing play in it.