Whirlpool service manuals state 640-650 for high speed, 425-429 for low speed (2 speed machines). Input pinion to main drive gear ratio is 9.58, spin gear (same rpm as main drive gear) to spin pinion gear is 3.61. Motor high speed rpm is 1725, low is 1140. That works out to 650 for high and 429 for low. That also works out to 180 stroke/min for agitate in high and 119 for low. Manual says high 177-181, low 118-122. Extra low is 88-92.
Eric