BMW 31509455991 Front Differential Assembly

Technical specifications for BMW genuine front differential assembly part number 31509455991. This unit features a 3.73 final drive ratio and is designed for front axle application on xDrive all-wheel-drive platforms. The assembly includes carrier and gear set configured for automatic transmission applications. Supersedes part numbers 31507592001, 31507592002, 31509455990, and 31-50-9-455-991. Engineered for BMW N52 3.0L and compatible diesel powertrains in F25/F26 chassis. Material composition consists of cast iron housing with forged steel ring and pinion gears. Designed for permanent lubrication with synthetic hypoid gear oil. Mounting flange pattern matches OEM specifications for direct bolt-on installation. Verified fitment for 2011-2017 BMW X3 F25 and 2015-2018 BMW X4 F26 with 3.73 ratio requirement.