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I know I am not the first to have this problem. My front end squeaks. I have 01 F-150. This has been and still is a great truck. I just can't stand this squeaking.
Not much to go on. There are lots of moving parts, and most of them can't be greased. Over time, water can displace the grease. Best thing to do at this point is to go to someplace like Autozone or whomever you use, and buy a stethoscope. They are about $10.00 or so, and work extremely well for this type of problem.
Just have someone rock the front end up/down to narrow the search area, then just touch the probe on every moving part. I used to do them all just by touch, but I'm not going to suggest that to anyone. The dry part will be simple to find.
A dried out bushing might be repairable with WD-40, most others should be changed. Upper A-arms are always a suspect part. When ever possible try and use Moog parts.
For me, the squeaking is annoying, but nothing serious, I took off my grille and repainted it, now i've sometimes got some squeak. Nothing too bad, i just took the grille off, and then put it back on! No more squeaking!