'97 chevy cavalier. Getting a hum from the front end, and a growl when I turn. Anyone ever change the wheel bearings, are they one piece? Just curious as to what the job entails.

Here's what it looks like and costs:

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They are not too difficult to replace. Be sure to get all corrosion off and pay close attention to proper alignment. Poor installation can cause Lateral Runout (LRO) problems with your brakes. I recommend you buy a Haynes Manual for your car. It will provide the proper torque specs for the spindle nut and step-by-step procedures.

'97 chevy cavalier. Getting a hum from the front end, and a growl when I turn. Anyone ever change the wheel bearings, are they one piece? just curious as to what the job entails.
The hub isn't too difficult if you have the proper puller, Torx socket and air-impact tools.
5110

Clean all contact surface of rust and/or debris.

REMOVE OR DISCONNECT
1. Drive axle.
2. Brake caliper bolts, and support caliper.
3. Rotor.
4. Hub and bearing assembly.
5. Hub and bearing assembly from steering knuckle.
6. Hub and bearing.

INSTALL OR CONNECT
1. Hub and bearing assembly to steering knuckle.
2. Hub and bearing assembly bolts.
O Tighten hub and bearing assembly bolts to 95 Nm (70 ft. lbs.)
3. Rotor.
4. Brake caliper and bolts.
5. New hub and bearing into steering knuckle.
6. Drive axle.
7. Check front wheel alignment.