I don't really care for the Dayco pulleys, all the ones I have purchased started chirping after a few months of use.pulley can be changed. i just did mine a few weeks ago. it was chirping when cold for months, i finally thought,,hmmmmm i should change that before it takes the belt out. after the belt was off the pulley barely spun. new was like 20 bucks for a dayco at advance auto.
mine was normal threads too for the pulley bolt.