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Its going to a bit of a PITA. The studs are pressed on. You are going to have to disassemble the entire rear wheel bearing assy from the car. Here is most of it from the GM manual.
My first tip would be to call your dealer and see how much they want to do it.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Remove the rear wheel hub/speed sensor assembly from the suspension knuckle. Refer to Wheel Bearing/Hub Replacement - Rear .
Wheel Bearing/Hub Replacement - Rear
Removal Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Disconnect the wheel speed sensor electrical connector.
Disconnect the real time damping (RTD) position sensor link, if equipped.
Remove the brake caliper and rotor. Refer to Brake Caliper Bracket Replacement - Rear and Brake Rotor Replacement - Front in Disc Brakes.
Remove the shock absorber solenoid electrical connector, if equipped.
Separate the outer tie rod end from the suspension knuckle. Refer to Tie Rod Replacement .
Remove the spindle nut retainer, the spindle nut and the washer. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
Separate the upper control arm (1) from the suspension knuckle. Refer to Rear Axle Upper Control Arm Replacement .
Separate the suspension knuckle from the lower control arm ball joint stud (4). Refer to Rear Axle Lower Control Arm Replacement .
Remove the suspension knuckle from the vehicle.
Remove the wheel hub mounting bolts.
Remove the hub and bearing assembly from the suspension knuckle.
Installation Procedure
Notice
The Front and Rear Wheel Hub/Wheel Speed Sensors are not interchangeable. When you are replacing a Wheel Hub/Wheel Speed Sensor be sure to use the correct Wheel Hub/Wheel Speed Sensor part number. Do not mount the Rear Wheel Hub/Wheel Speed Sensor in the front steering knuckle. The Rear Wheel Hub/Wheel Speed Sensor features a splined hole through the center of the bearing which mates to the drive axle. The Rear Wheel Hub/Wheel Speed Sensor requires the support of the drive axle and the drive axle nut clamped joint to properly carry the vehicle loads. Mounting the Rear Wheel Hub/Wheel Speed Sensor in the front steering knuckle can cause bearing failure and possible damage to the vehicle.
Install the wheel hub and bearing assembly to the suspension knuckle.
Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the wheel hub mounting bolts. Tighten
Tighten the wheel hub mounting bolts to 130 N·m (96 lb ft).
Install the suspension knuckle to the upper control arm (1). Refer to Rear Axle Upper Control Arm Replacement .
Install the suspension knuckle (2) to the lower control arm ball stud (4). Refer to Rear Axle Lower Control Arm Replacement .
Install the spindle nut, washer and retainer. Refer to Wheel Drive Shaft Replacement in Wheel Drive Shafts.
Install the outer tie rod end stud to the suspension knuckle. Refer to Tie Rod Replacement .
Install the brake rotor and caliper. Refer to Brake Caliper Bracket Replacement - Rear and Brake Rotor Replacement - Front in Disc Brakes.
Connect the wheel speed sensor electrical connector.
Install the shock absorber solenoid electrical connector, if equipped.
Connect the real time damping position sensor link, if equipped.
Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Lower the vehicle.
Install J 43631 onto the wheel hub and stud. (just a c-clamp with a hole in the backside to press the stud out)
Turn the forcing screw in until the stud is pushed out of the wheel hub.
Installation Procedure
Place a new stud in the wheel hub.
Place some washers (1) onto the wheel stud (3).
Important
Make sure that the wheel stud is fully seated against the wheel hub flange.
With the flat side of a wheel nut against the washers, tighten the wheel nut until the wheel stud head seats against the wheel hub flange.
Remove the wheel nut and washers.
Install the rear wheel hub/speed sensor assembly into the suspension knuckle. Refer to Wheel Bearing/Hub Replacement - Rear .
Install the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
Lower the vehicle.
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