My original gold 02 I-4 5-spd Camry transmission fragged itself. Sort of. Of all things, the speed sensor, which is a roughly cigar-sized (and shaped) device, which screws into a port on the side of the trans, came apart. The debris released was all plastic (probably has to do with why it came apart in the first place...), but out of an abundance of caution, Toyota decided to send in a totally new trans. The dealer himself, Bob Tyler of Bob Tyler Toyota, overrode the decision by simply offering my a totally new car. I accepted, of course. Hard to argue with that flavor of customer care.
EDIT: Yes, as I've described here several times before, I had a Buick dealer do the same thing for me several years before. Alas, in its infinite wisdom, GM decided to assassinate all of its stand-alone Buick dealers about ten years ago. If Jack Lee Buick had been permitted (by GM) to continue its existence, they'd still be high in my loyalty equation. GM killed them however -- how smart -- get rid of a dealer that had a rabid following of loyal customers...
But I digress. Yes, I've needed a new trans -- but ended up getting a new car instead. I can live with that.