Broken teeth doesn't sound right. Did they try to flush the transmission fluid? The only issue I had and have heard about was rumbling on acceleration from a stop and flushing the transmission fluid a few times seems to have fixed it for anyone that had that problem.

Sorry to hear about the problem you are having. I've only got 50K miles on my car I hope it doesn't break at 90K.

My hydroponics experiment

You ever notice how hard it is to lip read cartoon characters?
"Crazy is what the sane call Delta Flyer"