Product review (5 stars): Good quality motor
The motor in my Whirlpool dryer (model LGV7858AW0 purchased in 1993) stopped working.  It was taking longer to start the drum turning, especially with heavy loads, and eventually would just hum loudly then shut off.  There seemed to be a lot of negative comments on almost any source of a new motor, but I finally decided on this one, although there are cheaper prices elsewhere, because I trust Amazon to stand behind products sold on their site.  The new motor looked virtually identical to the old one, and appears to be of equal quality.

 I had a little trouble unscrewing the blower fan, but this procedure worked well:
1) leave motor mounts attached
2) use a large adjustable wrench tightened on the flat of the motor shaft in front of the motor (~7/16") and turn the motor CCW so the end of the wrench is resting against the bottom of the dryer.
3) put a 13/16" open end wrench on the blower fan nut making sure it is fully seated, and position the end of the wrench to the left of the motor.
4) rap down hard on the open end wrench and it should pop loose.  Note that a sharp impact on the end of the wrench works much better than just pushing against the wrench, and that the blower fan is a left-handed thread.

I had to rewire things because the new motor was slightly different, but directions were included, although they were a poor copy and a little hard to read.  I needed to change the crimp on terminals on two wires; the new terminals were included, but you also need a crimping tool, which would be annoying if you don't have one.  It would have been nice if they just included some adapters, which is what I made in case I ever need to put in an old-style motor.

I put in a new belt along with the new motor and it works great.  I do not notice any difference at all in performance or noise, but I will post an update if things change.

Update 7/22/17 - 6 months later still working perfectly.
Update 4/27/18 - 15 months - still running perfectly