Popping over sharp bumps?

might be a different pop than what i'm thinking of, but my tie-rods pop and creak every now and then under turns. at least i think it's my tie-rods, i'm actually trying to find out other causes...that's why i cam across this one. just noticed this was a fairly old post so if you have figured out what your's was let me know if you don't mind
 
My Steeda CC "popped" pretty bad...

also the bolts that hold the rack to the K-member can make a popping sound...on my car I removed them, cleaned the holes and sprayed them with lithium grease before reinstalling the bolts and that popping sound went away