Using the Special Tools (J38402, A - 20 ), compress the coil spring until there is only a little tension on the strut.
Do not use an impact gun.
Remove the self-locking nut at the top end of the shock absorber.
Remove the shock absorber mounting bracket, dust cover, spring upper pad.
Remove the special tool, and then remove the coil spring.
Fully extend the shock absorber rod.
Drill a hole to remove gas from the cylinder.
The gas coming out is harmless, but be careful of chips that may fly up when drilling. Be sure to use face shield and safety goggles.