And that's where it looks like it's heading.
Pulled the motor. Coupler is perfectly fine. Pulled the switch, sanded the contacts with some 600 grit, cleaned it. Still messed up but now it is major grinding clunking ready-to-blow-up sound. I'm pretty sure the tranny is shot. Probably the bearings or sumpin'. Don't want a rebuild kit (mixed results on rebuilds). Trannys are not cheap. Anywhere from $175 for a Chinesium Special up to $250 for a decent one. Not sure it's worth it for a 15 year old Whirlpool. I already have it Frankensteined, modified, and MacGyvered as it is. Wires jumped, cable ties holding stuff together, silicone smeared everywhere to stop leaks, etc. Probably takes an hour to swap out a tranny. That's not the issue. If I'm gonna sink $250 into a jalopy I may as well get a new one and be done with it.