{"product_id":"mfactory-bmw-e39-e46-e85-e81-e87-e89-e90-e92-helical-lsd-120d-123d-320d-325i-328i-330i-520d-525i-530i-z4-2-2i-z42-5i-z4-3-0i","title":"MFactory Helical LSD for BMW E39 E46 E85 E86 E89 E81 E82 E87 E88 E90 E91 E92 E93 – Limited Slip Differential Upgrade (120d 123d 320d 325i 328i 330i 520d 525i 530i 535i Z4 2.2i 2.5i 3.0i)","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eTorque-biasing differential upgrade for BMW E39, E46, E85, E86, E89, E81, E82, E87, E88, E90, E91, E92, E93\u003c\/h2\u003e\n  \u003cp\u003eTransform the way your BMW drives with a helical gear ATB diff that puts usable power to both rear wheels. This Torsen-style unit dramatically improves traction off the line, sharpens corner exit drive and gives you confident acceleration in the wet and dry. Quiet operation, smooth engagement and rock-solid reliability make it a superb road, fast-road and circuit solution for diesel and petrol models alike.\u003c\/p\u003e\n  \u003cp\u003eIf you are replacing an open rear end, chasing quicker lap times or simply want more grip without the compromises of a clutch-pack unit, this helical gear centre is the go-to drivetrain upgrade. It delivers consistent torque transfer without chatter and works brilliantly for daily use, spirited B-road driving, drag strip launches and track days.\u003c\/p\u003e\n\n  \u003ch3\u003eWhat you will feel\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFar better traction out of slow and medium-speed bends with reduced inside wheel spin\u003c\/li\u003e\n    \u003cli\u003eStronger, more predictable drive in poor weather and on uneven surfaces\u003c\/li\u003e\n    \u003cli\u003eSmooth power delivery with no plates to grab or wear out\u003c\/li\u003e\n    \u003cli\u003eStable turn-in and steering feel maintained under throttle\u003c\/li\u003e\n    \u003cli\u003eNo special friction modifiers required, simple service routine\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eEngineering that lasts\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eManufactured from premium Japanese SAE 4320 and SAE 9310 steels\u003c\/li\u003e\n    \u003cli\u003eForged, double tempered and super sub-zero treated for exceptional toughness\u003c\/li\u003e\n    \u003cli\u003eAdvanced shot peening for increased surface hardness and fatigue resistance\u003c\/li\u003e\n    \u003cli\u003eOptimised gear geometry for efficient torque bias and maximum grip utilisation\u003c\/li\u003e\n    \u003cli\u003eBuilt to handle high shock loads common in competition and hard launches\u003c\/li\u003e\n    \u003cli\u003eHigh quality Brighton-Best hardware throughout\u003c\/li\u003e\n    \u003cli\u003eHelical gearset design means no clutch packs, no routine rebuilds\u003c\/li\u003e\n    \u003cli\u003eOptional Race Pack upgrades available on selected platforms such as Honda and Mazda\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eReal-world feedback\u003c\/h3\u003e\n  \u003cp\u003eWe have installed and road-tested these helical diffs on multiple customer builds and the response has been excellent. Owners report faster corner exits, calmer traction control intervention and a big improvement in confidence on damp roads. It is a fit-and-forget performance differential that works day in, day out.\u003c\/p\u003e\n\n  \u003ch3\u003eFitment summary\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003e1 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eE81, E82, E87, E88 120d and 123d, 2004 to 2013, manual and automatic, final drive ratio 3.07 or lower\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003e3 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eE46 325i, 328i, 330i, 1998 to 2006, manual and automatic, final drive ratio 3.07 or lower\u003c\/li\u003e\n    \u003cli\u003eE90, E91, E92, E93 320d, 2004 to 2013, manual and automatic, final drive ratio 3.07 or lower\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003e5 Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eE39 520d, 525i, 530i, 535i, 1995 to 2003, manual transmission\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003e\u003cstrong\u003eZ Series\u003c\/strong\u003e\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eE85, E86, E89 Z4 2.2i, 2.5i, 3.0i, 2002 onwards, manual and automatic, final drive ratio 3.07 or lower\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eIf you are unsure about your final drive ratio or compatibility, contact us and we will confirm before dispatch.\u003c\/p\u003e\n\n  \u003ch3\u003ePre-shipment compatibility check\u003c\/h3\u003e\n  \u003cp\u003eWe verify fitment before shipping. Please add your UK registration or the last 7 of your VIN at checkout so we can confirm the correct application for your axle.\u003c\/p\u003e\n\n  \u003ch3\u003eProfessional installation\u003c\/h3\u003e\n  \u003cp\u003eWe recommend fitting at MJ Modifications in Warwickshire for a turnkey supply and install service. Request a fitted quote and lead time by emailing info@mjmodifications.co.uk. We can supply, install and road test your differential for complete peace of mind.\u003c\/p\u003e\n\n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eMF-TRS-05E46\u003c\/strong\u003e\u003c\/p\u003e\n\n  \u003ch3\u003eManufacturer\u003c\/h3\u003e\n  \u003cp\u003eMFactory\u003c\/p\u003e\n\n  \u003ch3\u003eWarranty\u003c\/h3\u003e\n  \u003cp\u003eLifetime warranty\u003c\/p\u003e\n\n  \u003cp\u003e\u003cem\u003eImage for illustration. Actual appearance may vary by application.\u003c\/em\u003e\u003c\/p\u003e\n\n  \u003ch3\u003eAlso searched as\u003c\/h3\u003e\n  \u003cp\u003eBMW torque biasing diff, BMW ATB differential, BMW Torsen style diff, rear axle upgrade for BMW, BMW drivetrain upgrade, open diff replacement BMW, E39 performance diff, E46 traction upgrade, E85 Z4 differential upgrade, E90 rear differential, E92 performance drivetrain, 120d rear diff, 123d traction upgrade, 320d rear axle, 325i ATB diff, 328i gear type diff, 330i helical gear centre, 520d differential upgrade, 525i rear end upgrade, 530i helical ATB, 535i final drive upgrade, Z4 3.0i rear diff, BMW grip upgrade, BMW corner exit traction, BMW road and track diff, BMW drift and track day setup, UK BMW diff specialist, BMW helical gearset, BMW power to both wheels, BMW performance parts UK.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"MFactory","offers":[{"title":"Default Title","offer_id":56005689704834,"sku":null,"price":1184.34,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/MFactory_BMW_Helical_LSD_E90_E92_325i_328i_330i_-_1_1946x_f737db60-2677-49e6-abb0-4c2e3dd61ad0.jpg?v=1764021550","url":"https:\/\/mjmodifications.co.uk\/products\/mfactory-bmw-e39-e46-e85-e81-e87-e89-e90-e92-helical-lsd-120d-123d-320d-325i-328i-330i-520d-525i-530i-z4-2-2i-z42-5i-z4-3-0i","provider":"MJ Modifications","version":"1.0","type":"link"}