Product review (5 stars): Dryer squealed like hog.......until....
I purchased this replacement kit for my Whirlpool dryer. From start to finish it took me about 45 minutes to install the parts.  Plugged it back in and started her up and it purred like a kitten. The difference with this guide pulley is that it comes with a wheel instead of a curved piece of metal like the one I pulled out that the belt runs on.  Whirlpool used the wheel design for decades then changed over to the inferior, cost cutting design. Anyway, if your dryer is squeaking and if you are handy, purchase this unit and you'll have peace and quiet.