how to change front wheel bearings on 2002 Chevy Silverado 1500

Front Wheel Hub, Bearing, and Seal Replacement

Tools Required
J 45859 Axle Remover
Removal Procedure

Notice: Never place vehicle on the ground with the halfshaft removed or the halfshaft nut torqued improperly. Otherwise, bearing seals may become dislodged causing premature wear and/or damage to the hub and bearing assembly.

Raise and support the vehicle. Refer to Vehicle Lifting.
Remove the tire and wheel.
Remove the rotor.
Remove the wheel speed sensor and brake hose mounting bracket bolt from the steering knuckle.

Remove the wheel drive shaft nut retaining cover.

Remove the wheel driveshaft assembly retaining nut (2) and washer (3) from the wheel driveshaft. Do nut reuse the nut. A new nut must be used when installing the wheel drive shaft.

Disengage the wheel drive shaft from the wheel hub and bearing using J 45859 or equivalent.

Remove the wheel hub and the 15-series bearing mounting bolts (4).

Remove the wheel hub and bearing (4) mounting bolts, 25/35 series.
Remove the wheel hub and bearing and splash shield from the vehicle.
Remove the O-ring seal from the steering knuckle bore, 25/35 series.
Remove the wheel speed sensor mounting bolt (5).
Clean and inspect the O-ring seal, 25/35 series.
Replace the seal if the following conditions exist:
Nicks
Cuts
Dry or brittle
Compression set
Installation Procedure

Clean all corrosion or contaminates from the steering knuckle bore and the hub and bearing assembly.
Lubricate the steering knuckle bore with wheel bearing grease or the equivalent.
Install the O-ring (7) to the steering knuckle, the 25/35 series. Notice: Refer to Fastener Notice in Service Precautions.
Install the wheel speed sensor mounting bolt to the wheel hub and bearing.
Tighten the sensor mounting bolt to 18 Nm (13 ft. lbs.).
Install the wheel hub and bearing and splash shield to the vehicle, 25/35 series.

Install the wheel hub and bearing (5) and splash shield (6) to the vehicle, 15 series.
Install the wheel hub and bearing mounting bolts, the 15 series. Install the wheel hub and bearing mounting bolts, 25/35 series.
Tighten the wheel hub to knuckle bolts to 180 Nm (133 ft. lbs.).

Install the nut (2) and washer (3) retaining the wheel drive shaft assembly to the wheel hub and bearing.
Tighten the nut to 210 Nm (155 ft. lbs.).

Install the wheel speed sensor and brake hose mounting bracket bolt to the steering knuckle.
Tighten the bolt to 12 Nm (106 inch lbs.).
Install the rotor.
Install the tire and wheel.
Lower the vehicle.

Try www.autozone.com for the step-by step guide along with pictures for this procedure.
Once at the site identify you car under the heading "current Vehicle"
Next click "Repair Info" on the tabs below the AutoZone logo.
At the middle of the page go to "Your Ride, Your Guide" and click "Become a member" set you username and password
Log-in and click "Vehicle repair guide"
Select the category for the repair needed.
Select (on the left) type of repair needed.
Page opens to your repair info.

Just tried it myself and info is there.

is this a 4 wheel drive?

The directions at Autozone.com include both two wheel and four wheel drive trucks.