Product review (5 stars): good for what ails ya....
I have a ~20 year old dryer and it's motor bearings started squealing.  because it is so old, my dryer isn't connectorized to the motor like the newer ones are, so I had to use the included crimp on terminals to connect my wiring to the motor.  fortunately it was pretty straightforward and there were decent instructions and crimp terminals included with the motor.

now instead of squealing like a pig it is purring like a kitten.  took the opportunity to vaccum out all the duct work, especially around the lint filter and blower housing.  the blower was hard to loosen from the old motor, but it finally gave in and let go.

main tip- wear gloves.  sheet metal is sharp.