Thanks Rusty. I will do exactly that (I think I have a 24 inch piece of rebar that I can use as the poor man's "stethoscope"). I wish I had a lift but maybe I can just get the whole front up on jack stands.
The problem with putting it on jack stands is, it likely will no longer make the noise, because the weight is off the tires. The weight really needs to be on the tires to really duplicate properly.