suonds like a baseball card that we put in the spokes of your bike when we were kids!! 2004 5.4l larit 90000 miles.just started 2 days ago..on the left side at 5 to 10 mph.with window down you can here this sound..runs great, no vibration,no pulling,still there when brakes aplied,nothing in tires,???

 

IWE's do a search, countless posts about it.

 

...IF... it's 4x4 that might be the problem.