Dave, I've had problems with the wheel speed sensors on my 02 Silverado, though not the bearings themselves. Unfortunately, they're all one unit. Left front first went out at 3 years old (of course, just out of warranty), then again almost exactly 3 years later, then the right front went shortly after that. Obviously some sort of flaw for which others were recalled, but Chevy said mine wasn't in the range of VIN numbers under recall so they wouldn't do anything about it. After a few calls and letters, they offered to give me a $1000 owner's loyalty certificate if I were purchasing new in the next year or so (which I promptly and tactfully told them to shove, in so many words).