This rugged aluminum center section is designed to hold up under high torque and save weight at the same time. Uses 1 3/4 large stem pinion and standard components. Uses 742 style large stem ring and pinions *fits 8 3/4 banjo housings (*weight reduction of 44% approximately 11 lbs less than production cast iron unit). *Features 6061 billet aluminum caps * stiffer than cast iron housing, decreases pinion deflection by 10% *. Uses 742 style bearings and shims, sure grips and service parts.Mopar Performance