How sure are you that its the LCA? Are you lowered? Lots of us have the popping sound going over bumps at slow speeds do to the strut tower mounts. Ford replaced mine and within 15 miles they make the same sound that i brought it in for.
2012 Grabber blue, Auto, Eibach pro street S coilovers, MM caster/camber plates, Borla ATAK cat back, off road X pipe, A.E.M CAI, SCT-x4 Mike Roush tune,SR LCA's, BMR Relocation brackets, J&M Pan hard bar, UPR Catch can, SVE 15x10's, Mickey T's 275-60-15.