{"product_id":"mfactory-bmw-e8x-e9x-f2x-f3x-final-drive-gears-m135i-m235i-135i-335i-435i","title":"MFactory BMW Final Drive Gear Set (Ring \u0026 Pinion) – 2.56 Final Drive Ratio Upgrade for E8X E9X F2X F3X: M135i, M235i, 135i, 335i, 435i (MT\/DCT) | MF-TRS-02E25","description":"\u003cdiv class=\"product__description rte\"\u003e\n  \n  \u003ch2\u003eUnlock harder launches and stronger in-gear pull from your BMW\u003c\/h2\u003e\n  \u003cp\u003eGive your rear axle the upgrade it deserves with the MFactory crown wheel and pinion set, ratio 2.56. This precision-engineered ring gear and pinion package transforms the way your car accelerates, delivering real-world pace and instant response without compromising drivability. Part number MF-TRS-02E25.\u003c\/p\u003e\n  \n  \u003cp\u003eDrivers report faster step-off, more urgent mid-range and a sharper hit through every gear. On average, users see a 10 to 15 percent increase in torque across the rev range versus OE gearing thanks to optimised tooth geometry and reduced driveline drag. Ideal for spirited road driving, track days and quarter-mile action.\u003c\/p\u003e\n  \n  \u003ch3\u003eWhy enthusiasts choose this rear differential gearset\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eFeel-it-now acceleration with revised gearing that improves real-world shove\u003c\/li\u003e\n    \u003cli\u003eAverage 10 to 15 percent torque gain across the rev range compared with factory ratio\u003c\/li\u003e\n    \u003cli\u003eMore power delivered to the tyres - race transmissions built on MFactory parts typically transfer 1 to 2 percent more power to the wheels than alternatives\u003c\/li\u003e\n    \u003cli\u003eDiamond-cut for ultra-tight tolerances for quiet, smooth operation\u003c\/li\u003e\n    \u003cli\u003eMotorsport-grade metallurgy - forged Japanese SAE 8620 and 4320 steel for strength and durability\u003c\/li\u003e\n    \u003cli\u003eForged, double tempered and super sub-zero treated for exceptional wear resistance\u003c\/li\u003e\n    \u003cli\u003eAdvanced shot peening to increase surface hardness and fatigue life\u003c\/li\u003e\n    \u003cli\u003eCAD and FEA optimised tooth profile for strength, efficiency and refined NVH\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eReal-world results, proven in our workshop\u003c\/h3\u003e\n  \u003cp\u003eWe have installed these gearsets on customer cars and in our own builds. Feedback is consistently excellent - crisper throttle response, stronger mid-range acceleration and a noticeable improvement in how the car drives on road and track.\u003c\/p\u003e\n  \n  \u003ch3\u003eCompatibility - direct-fit applications\u003c\/h3\u003e\n  \u003cp\u003eManual and DCT fitment as listed below. Ratio 2.56.\u003c\/p\u003e\n  \u003cul\u003e\n    \u003cli\u003eE82 and E88 135i - MT and DCT\u003c\/li\u003e\n    \u003cli\u003eE90, E91, E92, E93 335i and 335d - MT and DCT\u003c\/li\u003e\n    \u003cli\u003eF20 and F21 M135i 2012+ - MT\u003c\/li\u003e\n    \u003cli\u003eF22 and F23 M235i 2012+ - MT\u003c\/li\u003e\n    \u003cli\u003eF30 and F31 335i and 435i 2012+ - MT\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003cp\u003eNot sure if it fits your car? We offer a free fitment check before dispatch. Provide your UK registration or the last 7 digits of your VIN at checkout.\u003c\/p\u003e\n  \n  \u003ch3\u003eTechnical specification\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eRatio: 2.56\u003c\/li\u003e\n    \u003cli\u003eMaterial: Japanese SAE 8620 and 4320 forged steel\u003c\/li\u003e\n    \u003cli\u003eHeat treatment: forged, double tempered, super sub-zero treated\u003c\/li\u003e\n    \u003cli\u003eSurface: advanced shot peening\u003c\/li\u003e\n    \u003cli\u003eManufacture: diamond-cut to exacting tolerances\u003c\/li\u003e\n    \u003cli\u003eDesign tools: SolidWorks 3D CAD and Cosmos FEA\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003ePerfect for\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eRear diff ratio change for E8X, E9X, F2X, F3X platforms\u003c\/li\u003e\n    \u003cli\u003eM135i and M235i gearing upgrade\u003c\/li\u003e\n    \u003cli\u003e135i crown wheel and pinion swap\u003c\/li\u003e\n    \u003cli\u003e335i and 435i axle ratio conversion\u003c\/li\u003e\n    \u003cli\u003eFast road builds, track-day cars and drag setups seeking quicker acceleration\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \n  \u003ch3\u003eProfessional installation and setup\u003c\/h3\u003e\n  \u003cp\u003eCorrect installation and setup of ring gear and pinion are essential. Backlash, pinion depth and contact pattern must be set accurately for performance and longevity.\u003c\/p\u003e\n  \u003cp\u003eFor expert fitting and differential setup, choose MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk\u003c\/p\u003e\n  \n  \u003ch3\u003eCompatibility check\u003c\/h3\u003e\n  \u003cp\u003eWe will run a fitment check prior to dispatch. Provide your UK registration or the last 7 digits of your VIN at checkout.\u003c\/p\u003e\n  \n  \u003ch3\u003ePart number\u003c\/h3\u003e\n  \u003cp\u003eMF-TRS-02E25\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\u003eFor Race Use Only. MFactory Competition Products provides a limited 1 year warranty on this gearset to be free of defects in materials and workmanship upon receipt of product and at time of professional installation. It is the buyer or installer’s responsibility to verify suitability prior to installation. Parts that have been used in a running transmission or carrier are not covered. Any claim requires inspection and determination by MFactory before warranty credit or replacement is issued.\u003c\/p\u003e\n  \n  \u003ch3\u003eSearch-friendly terms\u003c\/h3\u003e\n  \u003cp\u003eBMW rear differential ratio upgrade, crown wheel and pinion 2.56, BMW axle gear ratio swap, BMW ring gear and pinion set, E82 E88 E90 E91 E92 E93 F20 F21 F22 F23 F30 F31 diff gears, 135i 335i 435i M135i M235i manual and DCT gearing, BMW rear end gears UK, performance differential gearset, BMW acceleration upgrade, BMW driveline parts UK, Warwickshire BMW specialist fitting, MF-TRS-02E25.\u003c\/p\u003e\n  \n\u003c\/div\u003e","brand":"MFactory","offers":[{"title":"Default Title","offer_id":56005756682626,"sku":null,"price":947.46,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0871\/5445\/8937\/files\/mfactory-final-drive-gears_1946x_ee3af19b-d8cc-423e-ad3c-e14a7cb68347.jpg?v=1764022142","url":"https:\/\/mjmodifications.co.uk\/products\/mfactory-bmw-e8x-e9x-f2x-f3x-final-drive-gears-m135i-m235i-135i-335i-435i","provider":"MJ Modifications","version":"1.0","type":"link"}