A shock absorber's purpose is to control the movement of the spring; without it, you would end up with indefinite bouncing that affects your ride and handling alike. Shock diagnosis is simple; just forcefully push down on the car's rear bumper, release and count the bounces. If your shocks are doing their job, the vehicle should not bounce more than one and a half to two times. Any more than that, the shocks are probably worn out. Removal and installation process is the same for both the left and right rear shock absorbers.
Items you will need
- Jack and jack stands
- 3/8-inch-drive metric socket set
- 3/8-inch-drive ratchet
- 3/8-inch-drive torque wrench
- Metric combination wrench set
- 1/2-inch-drive metric socket set
- 1/2-inch-drive ratchet
- 1/2-inch-drive torque wrench
Shock Absorber RemovalStep 1
Loosen the lug nuts on the rear wheels with your socket and ratchet. Jack up the rear of the vehicle and place jack stands under the designated lift points and lower the vehicle onto the jack stands. Remove the lug nuts and the wheels.
Shock Absorber RemovalStep 2
Jack up the rear knuckle to relieve spring tension.
Shock Absorber RemovalStep 3
Remove the lower shock bolt from the knuckle assembly.
Shock Absorber RemovalStep 4
Remove the upper shock mounting nuts, located on the top of the inner fender. Remove shock absorber.
Shock Absorber InstallationStep 1
Remove the new shock from its packaging and any device used to keep the shock compressed. Turn the shock upside down and extend and compress the shock absorber until the compression and rebound effort equalizes.
Shock Absorber InstallationStep 2
Place the shock into the mount at the top of the inner fender area and install the mounting nuts. Torque the mounting nuts to 66 foot-pounds with the torque wrench.
Shock Absorber InstallationStep 3
Align the lower shock mount to the rear knuckle and install the mounting bolt. Torque the mounting bolt to 133 foot-pounds.
Shock Absorber InstallationStep 4
Repeat for the other side of the car.
Shock Absorber InstallationStep 5
Install the wheels and snug the lug nuts. Lower the vehicle. Torque the lug nuts to 80 foot-pounds.
- The first step of the installation procedure is known as bleeding the shock. This step is one that is overlooked by many technicians. The purpose of this step is to equally distribute the hydraulic oil in the shock evenly on both sides of the internal valves of the shock absorber. This gives the shock absorber the ability to accurately control the spring movement in both directions. Not doing this step will make the shock generally stiffer in the extend direction and spongier in the compression direction reducing your vehicle’s ride quality.
- Alldata: 2006 Pontiac G6 Shock Absorber Replacement