High quality lithium based grease containing molybdenum with high drop point. Unique boot design depending on riding terrain for heat reduction. Dual heat treated axle components for added strength. 20-30% larger components compare to heavy-duty. CNC machined, micro-polished internal components. Re-engineered cage design to enhance durability. Entire axle made up of 4340 chromoly steel. Lithium based grease containing molybdenum disulfide and EP agent. Swing angle up to 47. 2 year limited warranty.