Belt or tensor pulley?

[Xrumer]

She sqweeks usually at 1st start and wears off, but now seems to sqweek at higher rev's.

 

[67Continental]

i replaced the belt, tensioner, and idler pulley for less than 100 bucks last month from max @ 5 star ford.

 

[04SSHD]

I did mine when I bought the car, First day I had it the serpentine belt shredded off. I lubricated the tensioner and replaced the belt and it stopped squeeling

 

[torquemonkey]

Idler pullery went out on mine @ 110k. Relpaced it and felt an odd vibration. Replaced the belt tensioner and the vibration went away. Both work in tandom, you will want to do both if you do one.

 

[Frat-man-du]

do all three - belt, tensioner, and idler pulley.