With the shocks in place you will need to then charge them with nitrogen. Many 4x4 shops now have this capability, or you may need to purchase a kit with a fill adapter. The shocks are filled in the reservoir to 200 psi. On Lance's 4Runner a custom body lift and fiberglass fenders are added to clear a set of 315/75R16 tires that equal just under 35s. The Total Chaos kit will clear 33s with just the fiberglass and is not recommended with the factory fenders as they hinder clearance dramatically.