Loud squeak 1998 Explorer

I have a very loud squeak on the left front of my car and it is driving me nuts!!! Help.Any ideas Ball joints ,A arm bushings ?TIA Bres

If 4WD there is a dust cover that can rub that is attached on the half shaft at the back of the bearing hub. Some have found that the tie rod squeeks at rack inside the boot. They have greases this by making a small hole with grease needle and sealing with silicone. It would not be unusual to need lower ball joints at this age but would expect you to notice other problems like tire wear. Is this a once per rev or what causes it?

Opera house,This is what i did(They have greases this by making a small hole with grease needle ) to the upper & lower ball joints & the squeak went away,i used white lithium grease seem to have self sealed. Bres