I had my front drivers side wheel bearing replaced RIGHT before the bumper to bumper warranty was about to expire.
It started to make an ever so slight crunching noise, which correlated to how fast I was going. The slower I drove, the crunching would be slow, the faster I drove, the crunching was quick sounding. I also drove near a building to hear it better.
At first, I thought this noise had something to do with the brakes, as if the heat sheild was rubbing against the rust on the rotor when the wheel was spinning.
When it got really bad, it was very frightening to drive on the highway, the car would be very unstable and liked to pull to the left (dealership was so busy, they scheduled my appointment 7 days after I initially called them, and being my only car, I had to drive it that way).
The leaky/jerky transmission, failed wheel bearing, creaky strut mounts, non-working door locks, clunking steering shaft, sticking fuel injector, etc... made me buy the GM Majorguard extended warranty.
Now I think the front passenger side is going bad... I wish they could have just replaced both at the same time.