{"product_id":"bmw-215lw-fully-forged-lsd-unit-f-series-n55-b58","title":"BMW 215LW Fully-Forged LSD Unit – F-Series N55 \u0026 B58","description":"\u003c!-- split --\u003e\n\u003ch2 style=\"text-align: center;\"\u003eFully-Forged Limited Slip Differential (LSD) Unit for BMW 215LW — F-Series N55, B58 \u0026amp; High-Torque Models\u003c\/h2\u003e\n\u003cp\u003eTransform the traction and handling of your BMW F-Series with the \u003cstrong\u003eRacingDiffs Fully-Forged 215LW Limited Slip Differential (LSD) Unit\u003c\/strong\u003e. Designed as a high-performance LSD upgrade for BMW models equipped with the \u003cstrong\u003e215LW differential\u003c\/strong\u003e, this unit delivers strong, predictable locking, improved acceleration out of corners, and significantly better control under power.\u003c\/p\u003e\n\u003cp\u003eDeveloped for powerful rear-wheel-drive and xDrive BMW applications, the 215LW differential is commonly found in some of the most popular performance models of the F-Series generation, including the \u003cstrong\u003eBMW M135i, M235i, 335i, 340i, 435i and 440i\u003c\/strong\u003e, as well as high-torque diesel models such as the \u003cstrong\u003e125d, 225d, 325d, 330d, 335d, 425d, 430d and 435d\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eWhether your BMW is powered by the legendary \u003cstrong\u003eN55\u003c\/strong\u003e, the highly tunable \u003cstrong\u003eB58\u003c\/strong\u003e, or one of BMW's high-torque N47, B47 or N57 diesel engines, the RacingDiffs Fully-Forged LSD unit is engineered to provide the traction, strength and adjustability required for \u003cstrong\u003eperformance street driving, track days, drifting, hill climb, rally and other motorsport applications\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c!-- Features --\u003e\n\u003cdetails id=\"features\" class=\"rd-acc\"\u003e\n\u003csummary\u003eFeatures\u003c\/summary\u003e\n\u003cdiv class=\"rd-body\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully forged construction:\u003c\/strong\u003e Both the LSD housing and internal components are forged for exceptional strength, durability and resistance to high torque and shock loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesigned for BMW 215LW differentials:\u003c\/strong\u003e Purpose-built for the 215LW differential family used across a wide range of high-performance BMW F-Series models.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable ramp settings:\u003c\/strong\u003e Three lock profiles allow the differential behavior to be tailored to your driving style and application:\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e30\/30\u003c\/strong\u003e — aggressive 2-way configuration for drifting and maximum locking response on acceleration and deceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30\/60\u003c\/strong\u003e — versatile 1.5-way setup for hill climb, rally, circuit racing, time attack and performance driving.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50\/65\u003c\/strong\u003e — progressive and smooth engagement for performance street use and track days.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium clutch pack:\u003c\/strong\u003e Equipped with 4 × molybdenum-ceramic clutch plates engineered for consistent locking performance and supplied with a \u003cstrong\u003eLifetime Warranty\u003c\/strong\u003e on the clutch plates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStrong mechanical preload:\u003c\/strong\u003e Provides immediate and predictable differential response without relying on electronic intervention to transfer torque between the driven wheels.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized NVH:\u003c\/strong\u003e Correct setup, preload and high-quality LSD oil provide smooth operation while maintaining strong locking performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-power ready:\u003c\/strong\u003e The fully forged architecture is designed for tuned N55 and B58 engines, high-torque diesel applications and demanding motorsport use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c!-- Performance Benefits --\u003e\n\u003cdetails id=\"benefits\" class=\"rd-acc\"\u003e\n\u003csummary\u003ePerformance Benefits\u003c\/summary\u003e\n\u003cdiv class=\"rd-body\"\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved traction:\u003c\/strong\u003e Transfers torque more effectively between the driven wheels, reducing unwanted one-wheel spin and improving acceleration out of corners.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBetter power delivery:\u003c\/strong\u003e Helps powerful BMW N55 and B58 models put their torque to the ground more effectively.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced corner exit:\u003c\/strong\u003e Allows earlier and more confident throttle application when accelerating out of a corner.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePredictable handling:\u003c\/strong\u003e Mechanical locking provides consistent and repeatable differential behavior at the limit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved drift control:\u003c\/strong\u003e Strong and adjustable locking characteristics make the car easier to initiate, balance and control under power.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotorsport versatility:\u003c\/strong\u003e Adjustable ramp configurations allow the same LSD platform to be optimized for street, track, drift, hill climb, rally and time attack applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt for high torque:\u003c\/strong\u003e Forged construction is engineered to withstand the demanding torque output of tuned BMW N55, B58 and high-performance diesel engines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c!-- Technical Specs \/ Installation Tips --\u003e\n\u003cdetails id=\"tech\" class=\"rd-acc\"\u003e\n\u003csummary\u003eTechnical Specs \/ Installation Tips\u003c\/summary\u003e\n\u003cdiv class=\"rd-body\" style=\"text-align: center;\"\u003e\n\u003ctable style=\"width: 100%; max-width: 760px; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDifferential type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003eBMW 215LW\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003eFully forged housing and internal components\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eRamp options\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e30\/30 (2-way), 30\/60 (1.5-way), 50\/65 (smooth progressive lock)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eDefault configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e50\/65° unless otherwise specified\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eClutch pack\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e4 × molybdenum-ceramic clutch plates\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eClutch plate warranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003eLifetime Warranty\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eRecommended applications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003eStreet, track, drift, hill climb, rally and time attack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eOil recommendation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003eHigh-quality 75W-140 LSD oil, such as Ravenol Racing 75W-140 or equivalent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\u003cstrong\u003eBacklash target\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 6px 10px; border-bottom: 1px solid #eee;\"\u003e\n\u003cstrong\u003e0.08–0.12 mm\u003c\/strong\u003e on most BMW ring-and-pinion sets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cul style=\"margin-top: 10px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional installation recommended:\u003c\/strong\u003e Correct carrier bearing preload, ring-and-pinion backlash and contact pattern should be checked during installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBacklash setup:\u003c\/strong\u003e Always measure the original setup before disassembly and verify the final backlash and gear contact pattern after installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant:\u003c\/strong\u003e Differential compatibility should be confirmed by differential type rather than chassis or engine alone, as specifications may vary depending on production date, transmission and market.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/youtu.be\/FIacgDBK6WI\" target=\"_blank\" title=\"5 Easy Steps to Install an LSD in BMW 135i, M140i, M240i \u0026amp; 340i Differentials (Welded Ring Gear)\" rel=\"noopener\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0361\/7652\/7495\/files\/BMW_LSD_installation_tutorial_welded_ring_gear_sajt_480x480.jpg?v=1782720196\" alt=\"BMW LSD (Lateral Differential Steering) installation guide with two gear components on a yellow background.\" style=\"float: none;\"\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c!-- Fitment --\u003e\n\u003cdetails id=\"fitment\" class=\"rd-acc\"\u003e\n\u003csummary\u003eCompatible BMW Models — 215LW Differential Fitment\u003c\/summary\u003e\n\u003cdiv class=\"rd-body\"\u003e\n\u003cp\u003eThis Fully-Forged LSD unit is designed for the \u003cstrong\u003eBMW 215LW differential\u003c\/strong\u003e found in the following applications:\u003c\/p\u003e\n\u003ch4\u003eBMW 1 Series\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eF20:\u003c\/strong\u003e 125d N47S1, M135i N55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF20 LCI \/ Facelift:\u003c\/strong\u003e 125d B47, M135i N55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF21:\u003c\/strong\u003e 125d N47S1, M135i N55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF21 LCI \/ Facelift:\u003c\/strong\u003e 125d B47, M135i N55\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eBMW 2 Series\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eF22:\u003c\/strong\u003e 225d N47S1, 225d B47, M235i N55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF23:\u003c\/strong\u003e 225d B47, M235i N55\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eBMW 3 Series\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eF30:\u003c\/strong\u003e 325d N47S1, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 335i N55, 335i xDrive N55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF30 LCI \/ Facelift:\u003c\/strong\u003e 325d N47S1, 325d B47, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 340i B58, 340i xDrive B58\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF31:\u003c\/strong\u003e 325d N47S1, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 335i N55\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF31 LCI \/ Facelift:\u003c\/strong\u003e 325d N47S1, 325d B47, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 340i B58, 340i xDrive B58\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF34:\u003c\/strong\u003e 325d N47S1, 330d N57N, 330d xDrive N57N, 335d xDrive N57Z, 335i N55\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eBMW 4 Series\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eF32:\u003c\/strong\u003e 425d N47S1, 425d B47, 430d N57N, 430d xDrive N57N, 435d xDrive N57Z, 435i N55, 435i xDrive N55, 440i B58, 440i xDrive B58\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF33:\u003c\/strong\u003e 425d N47S1, 425d B47, 430d N57N, 435d xDrive N57Z, 435i N55, 440i B58\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eF36:\u003c\/strong\u003e 425d B47, 430d N57N, 430d xDrive N57N, 435d xDrive N57Z, 435i N55, 440i B58\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003e*BMW differential specifications may vary by production date, transmission, drivetrain and market. If your exact vehicle configuration is not listed or you are unsure whether your car uses a 215LW differential, please contact us before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c!-- Why Upgrade --\u003e\n\u003cdetails id=\"why-upgrade\" class=\"rd-acc\"\u003e\n\u003csummary\u003eWhy Upgrade Your BMW F-Series to a Limited Slip Differential?\u003c\/summary\u003e\n\u003cdiv class=\"rd-body\"\u003e\n\u003cp\u003ePower is only useful when it can be transferred effectively to the road. On powerful BMW F-Series models, especially tuned \u003cstrong\u003eN55 and B58\u003c\/strong\u003e cars, an open differential can limit traction by allowing one wheel to spin when accelerating hard or exiting a corner.\u003c\/p\u003e\n\u003cp\u003eA mechanical clutch-type \u003cstrong\u003eLimited Slip Differential\u003c\/strong\u003e improves torque distribution between the driven wheels, helping the car accelerate more effectively and behave more predictably under power. The result is improved traction, stronger corner exits and greater driver control.\u003c\/p\u003e\n\u003cp\u003eFor popular performance models such as the \u003cstrong\u003eBMW M135i, M235i, 335i, 340i, 435i and 440i\u003c\/strong\u003e, a properly configured LSD is one of the most significant drivetrain upgrades available—particularly for modified, high-power, track or drift applications.\u003c\/p\u003e\n\u003cp\u003eThe RacingDiffs Fully-Forged 215LW LSD combines the strength required for high-torque applications with adjustable ramp geometry, allowing the differential to be configured around the way the car is actually used.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp style=\"margin-top: 10px;\"\u003e\u003cem\u003e*Due to continued product improvement, the product illustrated in photos may vary slightly from the actual product.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top: 10px;\"\u003e\u003cem\u003e*Vehicle fitment is based on BMW 215LW differential applications. Differential specifications can vary by production date, transmission, drivetrain and market. If you are unsure about compatibility, please contact us before ordering.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top: 10px;\"\u003e\u003cem\u003eUnless otherwise specified, all Fully-Forged LSD units are supplied with the recommended \u003cstrong\u003e50\/65° ramp configuration\u003c\/strong\u003e, offering the best balance between everyday drivability and performance.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp style=\"margin-top: 10px;\"\u003e\u003cem\u003e\u003cstrong\u003eMotorsport product notice:\u003c\/strong\u003e This is a performance-oriented motorsport component. Some mechanical differential noise may occur during parking maneuvers or slow, sharp turns, particularly with the more aggressive 30\/30 and 30\/60 ramp configurations.\u003c\/em\u003e\u003c\/p\u003e","brand":"RacingDiffs","offers":[{"title":"2.81 and lower","offer_id":47947447042284,"sku":"RD1021","price":1399.0,"currency_code":"EUR","in_stock":true},{"title":"3.07 and higher","offer_id":47947447075052,"sku":"RD1022","price":1399.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0361\/7652\/7495\/files\/bmw-215lw-fully-forged-lsd-unit-f-series-racingdiffs.jpg?v=1784109809","url":"https:\/\/racingdiffs.com\/products\/bmw-215lw-fully-forged-lsd-unit-f-series-n55-b58","provider":"RacingDiffs","version":"1.0","type":"link"}