Mine were OK until I painted the pulleys,then the screeching started.
I scuffed up the contact area where the belts go with a Scotchbrite pad,problem sorted......


1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.