Top wishbone replacement

[Nickrs4.2]

I have a knock noise coming from n/s/f. I gave jacked car and can see a cracked bush on the top rear wishbone, can you change this arm without removing the shock and discharging the drc? I no you would have to drop the shock in order to get bolts out. Any help appreciated

[gt2]

Pretty sure you can do this without discharging the DRC