One of the advantages of the Z1 Platinum Series 1 piece driveshafts when compared to a stock driveshaft is the use of easy to replace Spicer Universal Joints.  These heavy duty Spicer Life joints are the same joints factory installed in all Z1 Platinum Series driveshafts.  This joint will replace all u-joints in Z1 Platinum Series Aluminum or Steel driveshafts.