Just finished the install this weekend. Hope it helps everyone out
there.

Here is a detailed How-To on installing Suspension on a 2003-2006
Infiniti G35 Coupe. Remember when working on suspension of a car,
always use extreme care and proper tools.

Tools needed:

Factory Jack
Floor Jack
1/2" Rachet (3/8")
1/2" Extensions (3/8")
17mm Socket
12mm Socket
19mm Socket
17mm Box End Wrench
Air Tools
Torque Wrench
Spring Compressor
Rear Suspension:

Jack up car using factory jack. Remove wheel and tire. Now place floor
jack below the rear lower link that the coil spring is located in and
use the jack to hold the spring in place, raising it up a 1/8" or so.
Refer to the picture and remove the nut and bolt to the rear lower link
(blue arrow). Remove bolt from bottom of strut mount (red arrow).
Picture is from above looking down.
NOTE: There is NO need to remove the bolt depicted in red if you are
only installing springs.


http://www.auto-talk.net/how-to/infi...initi-g35.html