What is this part called? 1302 / 1303 Beetle IRS Helical LSD 33 to 37 Tooth Conversion Kit What does this part do on a VW? This conversion kit allows a Blackline helical limited-slip differential (SKU: 020050020) to be adapted from the earlier 33-tooth configuration to suit 37-tooth applications found in specific IRS Beetle transaxles. It provides the components required to correctly convert the differential for compatibility with later 37-tooth ring gear setups. Designed for use in performance, motorsport, and high-powered street applications, this conversion kit enables the installation of a modern helical limited-slip differential into compatible Volkswagen IRS gearboxes. A helical LSD improves traction by automatically transferring torque to the wheel with the greatest grip, enhancing acceleration, cornering stability, and overall vehicle control without the maintenance requirements associated with clutch-type differentials. What are the technical details? - Conversion kit for Blackline HLF065 helical LSD - Converts differential from 33-tooth to 37-tooth configuration - Designed for Volkswagen IRS transaxles - Precision-machined components - Allows fitment of 37-tooth ring gear applications - Suitable for performance and motorsport use - Manufactured from high-quality materials - Direct fit for compatible Blackline differentials - Improves compatibility across multiple gearbox applications - Ideal for high-performance street and race vehicles - Sold as a complete conversion kit Which VW models will this fit? - Beetle 1302 1971–1972 (IRS transmission applications) - Beetle 1303 1973–1979 (IRS transmission applications) - Compatible with Volkswagen IRS gearboxes using a 37-tooth ring gear Important Fitment Notes - Designed specifically for Blackline (SKU: 020050020) helical LSD units - Intended for 37-tooth IRS ring gear applications only - Professional gearbox assembly recommended - Differential setup, backlash, and bearing preload must be checked during installation - Not suitable for swing axle transmissions - Verify gearbox specification before ordering What is the SKU for this part? SKU: 020050021 SKU: 020050021