They are about the easiest that I have ever replaced on any vehicle.

Removal
Raise and support the vehicle.
Remove the tire and wheel assembly.
Support the control arm with a jack stand.
Disconnect the ELC air tube from the shock.
Remove the two bolts securing the shock to the control arm.
Remove the trunk trim to gain access to the shock upper mounting nuts.
Remove the cover, the two nuts, and the reinforcement from the top of the shock.
Remove the shock from the vehicle.

Installation Procedure
Install the shock, reinforcement, and the two nuts. Tighten the mounting nuts to 20 Nm (15 ft. lbs.).
Install the shock cover.
Install the trunk trim.
Install the shock-to-control arm bolts. Tighten the bolts to 24 Nm (18 ft. lbs.).
Connect the ELC air tube to the shock.
Install the tire and wheel assembly. Tighten the wheel nuts to 140 Nm (100 ft. lbs.).
Lower the vehicle.

I just found out that both of my rear shocks are leaking too. I was wondering whether it is better to replace with OE shocks..GM part #22064808 & 22064809 or Monroe MA822. The OE'* are more expensive. Some other members said that the Monroe'* gave a stiffer ride. I would rather have a less stiff ride. Any thoughts?

ruby76, how did the shocks turn out?? good ride?? Did you replace the shock mounts? If so what kind, GM or Monroe??

THis may help.....

http://www.bonnevilleclub.com/forum/tech/elc/