Screeching Sound

Belt alignment! Sometimes a washer, or two may be needed to make sure the belts run true. I did all the soap, tightening, loosening. Then one day my neighbor (an old timer who knew his way around an engine) eye balled my alternator belt, and sure enough it was just a bit behind the crank pulley. Added a 3/32 washer, and bingo, the squeal at 45 mph went away. So eye ball the alignment real good.