{"product_id":"wavetrac-torque-biasing-differential-bmw-135i-e8x-335i-e9x-215k-axle-r308","title":"Wavetrac Torque Biasing Differential - BMW 135i (E8X) \/ 335i (E9X) - 215K Axle R=3.08+","description":"\u003ch2\u003eWavetrac Torque Biasing Differential - BMW 135i (E8X) \/ 335i (E9X) - 215K Axle R=3.08+\u003c\/h2\u003e\n\n\u003cp\u003eDesigned from the ground up using modern gear technology, the Wavetrac Differential sets itself apart from conventional helical limited slip units with one key innovation — patented cam technology that maintains drive to the gripping wheel even during zero axle load conditions. Where a standard torque biasing differential behaves like an open diff when a wheel lifts or loses traction, the Wavetrac's internal cam device generates load to keep power going where it counts. Built in the USA by Autotech Driveline, every unit is assembled with ARP fasteners and machined from case-hardened steel billet, with internal gears in high strength 9310 alloy steel.\u003c\/p\u003e\n\n\u003cp\u003eThis listing covers the Wavetrac differential for the \u003cstrong\u003eBMW 215K axle with welded ring gear\u003c\/strong\u003e, suited to the \u003cstrong\u003eE9X 335i\u003c\/strong\u003e and \u003cstrong\u003eE8X 135i\u003c\/strong\u003e with a final drive ratio of R=3.08 and above. Note that all welded OEM gear assemblies require machining work prior to installation. An Installation Kit is sold separately and is required to complete the fitment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This application uses a welded OEM ring gear assembly. Machining work is required before installation. Do not attempt fitment without the appropriate Installation Kit — sold separately. Please confirm your axle ratio before ordering.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePatented cam device maintains drive under zero axle load — eliminates the open diff behaviour common to standard torque biasing units\u003c\/li\u003e\n  \u003cli\u003eOptimised helical gear tooth profile for improved strength and oil film retention\u003c\/li\u003e\n  \u003cli\u003eCompact gear package reduces overall mass without sacrificing durability\u003c\/li\u003e\n  \u003cli\u003eMaximised material thickness at the side gear and axle interface — critical in high power applications\u003c\/li\u003e\n  \u003cli\u003eInternal gears machined from 9310 high strength alloy steel\u003c\/li\u003e\n  \u003cli\u003eDiff body machined from case-hardened steel billet\u003c\/li\u003e\n  \u003cli\u003eAssembled exclusively with ARP high strength fasteners\u003c\/li\u003e\n  \u003cli\u003eSuits BMW 215K axle with welded ring gear, R=3.08+\u003c\/li\u003e\n  \u003cli\u003eTransferable Limited Lifetime Warranty included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eVehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please confirm your vehicle's axle ratio, trim level, and configuration before ordering.\u003c\/p\u003e\n\n\u003cp\u003eNot sure if this differential suits your build? Contact our team at \u003ca href=\"mailto:sales@chicaneaustralia.com.au\"\u003esales@chicaneaustralia.com.au\u003c\/a\u003e for expert advice.\u003c\/p\u003e","brand":"Wavetrac","offers":[{"title":"Default Title","offer_id":52429333365029,"sku":"30.309.155WK","price":2849.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0918\/2943\/6709\/files\/WTC_BMW_30.309.155WK.webp?v=1779758386","url":"https:\/\/www.chicaneaustralia.com.au\/products\/wavetrac-torque-biasing-differential-bmw-135i-e8x-335i-e9x-215k-axle-r308","provider":"Chicane Australia","version":"1.0","type":"link"}