I recently heard a squeak on my Duster and took a closer look.
What I found on the passenger side is that I had the alignment cams mis-aligned to get the proper caster / camber and did not readjust the poly-end to put the cams in as close to the 12 o'clock position as possible. I forgot the adjustable ends on the UCA do more than change the track width.
Keeping the factory alignment cams closely aligned allows the UCA to pivot up and down smoothly. By NOT re-adjusting the ends, I had put the poly ends in a bind, eventually causing a squeak.
it is important to remember to move the assembly (installed UCA / LCA / spindle) up and down without the shock in place to verify it moves freely before installing the shock and buttoning it up.