I know this is old, but for other people watching. Don't use a universal joint with the impact if you're struggling to get a bolt off because it'll eat up all the torque from the impact.
When you have a frozen bolt like that and it's near the grounf (like a caliper bolt) I use my 1/2" drive 25" breaker bar ($14 @ harbor f) and use my floor jack on the ground to break it free. Good information man, good vid, bout to start my coilover day right now!
Hello brother, tell me please, have you done chassis reinforcements before installing true coilovers? Some people are telling me I can't install true coilovers without chassis reinforcement! What are the spring rates on your coilovers?