Designed to reduce weight and hold up under high torque. Uses 1-3/4-inch large stem pinion and standard components. The 8-3/4-inch aluminum axle housing uses "742-style" large stem ring and pinions and fits 8-3/4-inch banjo housings (up to 1974). It features a weight reduction of 44% (approximately 11 lbs. to 14 lbs.), compared to production cast iron housing, and includes 6061 billet aluminum caps. It is stiffer than cast iron, and decreases pinion deflection by 10%. It uses "742-style" bearings and shims, service parts and sure-grips. Clearance required on 3.23:1 or higher ratios. Adjuster lock bolts may need to be replaced with socket head bolts.