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MFactory

MFactory BMW Final Drive Gear Set (Ring & Pinion) – 2.56 Final Drive Ratio Upgrade for E8X E9X F2X F3X: M135i, M235i, 135i, 335i, 435i (MT/DCT) | MF-TRS-02E25

MFactory BMW Final Drive Gear Set (Ring & Pinion) – 2.56 Final Drive Ratio Upgrade for E8X E9X F2X F3X: M135i, M235i, 135i, 335i, 435i (MT/DCT) | MF-TRS-02E25

£947.46
£1,007.94 £947.46
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Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

Unlock harder launches and stronger in-gear pull from your BMW

Give 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.

Drivers 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.

Why enthusiasts choose this rear differential gearset

  • Feel-it-now acceleration with revised gearing that improves real-world shove
  • Average 10 to 15 percent torque gain across the rev range compared with factory ratio
  • More power delivered to the tyres - race transmissions built on MFactory parts typically transfer 1 to 2 percent more power to the wheels than alternatives
  • Diamond-cut for ultra-tight tolerances for quiet, smooth operation
  • Motorsport-grade metallurgy - forged Japanese SAE 8620 and 4320 steel for strength and durability
  • Forged, double tempered and super sub-zero treated for exceptional wear resistance
  • Advanced shot peening to increase surface hardness and fatigue life
  • CAD and FEA optimised tooth profile for strength, efficiency and refined NVH

Real-world results, proven in our workshop

We 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.

Compatibility - direct-fit applications

Manual and DCT fitment as listed below. Ratio 2.56.

  • E82 and E88 135i - MT and DCT
  • E90, E91, E92, E93 335i and 335d - MT and DCT
  • F20 and F21 M135i 2012+ - MT
  • F22 and F23 M235i 2012+ - MT
  • F30 and F31 335i and 435i 2012+ - MT

Not 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.

Technical specification

  • Ratio: 2.56
  • Material: Japanese SAE 8620 and 4320 forged steel
  • Heat treatment: forged, double tempered, super sub-zero treated
  • Surface: advanced shot peening
  • Manufacture: diamond-cut to exacting tolerances
  • Design tools: SolidWorks 3D CAD and Cosmos FEA

Perfect for

  • Rear diff ratio change for E8X, E9X, F2X, F3X platforms
  • M135i and M235i gearing upgrade
  • 135i crown wheel and pinion swap
  • 335i and 435i axle ratio conversion
  • Fast road builds, track-day cars and drag setups seeking quicker acceleration

Professional installation and setup

Correct installation and setup of ring gear and pinion are essential. Backlash, pinion depth and contact pattern must be set accurately for performance and longevity.

For expert fitting and differential setup, choose MJ Modifications in Warwickshire. Request a quote: info@mjmodifications.co.uk

Compatibility check

We will run a fitment check prior to dispatch. Provide your UK registration or the last 7 digits of your VIN at checkout.

Part number

MF-TRS-02E25

Manufacturer

MFactory

Warranty

For 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.

Search-friendly terms

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