You might also want to jack up the front end and give the wheels a to-fro to see if you have a bad bearing just in case, while its up there, crank it up and turn the wheels to see if its coming from the rack. Some of those have puked in the past especially on '02 models. I noticed mine leaking a little as it gets older. Other than that it will be one of the linkage joint, e.g. balljoint, tie-rod, sway-bushing etc.....I know if the sway is not tightened up, it will give a pop when load is placed on it, the above check will reveal that. When it is in the air, the load on the sway will be equal on both sides, so it shouldnt pop. Goes for most vehicles.