The axles on your 350Z are constantly under tremendous pressure. Overtime, the torque from spirited driving and hard launches wear the joints until eventually they break. It is also common for the grease boots to crack allowing dirt and other contaminates into the joints, and letting the grease out. This often results in excessive wear and premature failure.
Replacing your worn or broken axles with new OEM axles ensures many more years of trouble free operation.
If your axles simply need replacement grease boots, service kits can be found HERE.
*NOTE* For high horsepower and drag applications applications Z1 recommends using Driveshaft Shop axles. These can be purchased in a set HERE.
Nissan Value Advantage axles are also available HERE.