Whirlpool washer vibration

my son-in-laws washer vibrates heavily in spin cycle, i suggested it was a suspension issue, either broken springs, pads,basket drive, or bent tripod, anyone have any ideas?.i have some parts manuals from being in the repair business for 2o years or so, been out of the business for several years now and cant remember the most common reason for that. old age i guess. anyone have a good guess or ideas i would love to hear them a nd even share what i know, did alot of “high end” appliance repairs…thanks for everyones time…john

washer vibrates heavily in spin cycle, loaded or unloaded