Chevrolet Trailblazer Service Manual page 538

Lower Control Arm
Removal & Installation
To Remove:
1. Lift the vehicle.
2. Lift the rear axle to drive height.
3. If equipped with air suspension, depressurize the air suspension system.
Lower control arm axle mounting bolt removal and installation
Lower control arm frame mounting bolt removal and installation
5. Detach the lower control arm from the axle and frame.