If I remember correctly there were two...this was about 10 years ago...During cruising I would sometimes hear a rattle from the rear, as if there was a rock or something inside one of the drums.
The second, it only did this two or three times, but from a stop I would get a clunk upon accelerating...if I had to guess I'd say it was caused by the pinion landing on a chipped/broken tooth of the ring gear. At the time I figured the parking brake wasn't releasing.
I've gained a lot of automotive knowledge and training since then, and I laugh that I never thought to pull the cover off the rear and check it out.
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