1 1

MFactory

MFactory Final Drive Ring & Pinion Gears for BMW E82 E88 E90 E91 E92 E93 F20 F21 F22 F23 F30 F31 (135i 335i 435i M135i M235i) - Shorter Ratio Performance Upgrade MF-TRS-02E28

MFactory Final Drive Ring & Pinion Gears for BMW E82 E88 E90 E91 E92 E93 F20 F21 F22 F23 F30 F31 (135i 335i 435i M135i M235i) - Shorter Ratio Performance Upgrade MF-TRS-02E28

£947.46
£1,007.94 £947.46
Sale Sold out
Shipping calculated at checkout.

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.

BMW 1 Series, 3 Series and 4 Series Crownwheel and Pinion Ratio Upgrade by MFactory

Wake up your turbo BMW with a shorter rear axle ratio that delivers explosive in-gear pace, razor-sharp throttle response and harder launches. This premium MFactory crown wheel and pinion gearset replaces the factory differential gearing to give a noticeably quicker drive across the whole rev range. Expect a dramatic improvement in real-world acceleration with around 10 to 15 percent more torque felt at the wheels compared to the stock 2.81 ratio, making it a superb choice for fast road, track day and drag strip builds.

We run these gearsets on our own projects at MJ Modifications and on customer cars. The feedback is consistent every time: stronger pull, livelier response and a car that feels more urgent in every gear. If you want your N54 or N55 powered BMW to hit harder out of corners and surge through the mid-range, this is the upgrade.

Why enthusiasts choose this ratio change

  • Shorter gearing for quicker 0 to 60 and harder in-gear acceleration
  • Transforms drivability on road and circuit with crisper response
  • Ideal for street builds, time attack, track days and drag racing
  • Optimised tooth profile to reduce losses and put more power to the tarmac

Engineering you can trust

  • Cut to ultra-tight tolerances from forged high nickel chromium molybdenum steel
  • Manufactured from imported Japanese SAE 8620 and 4320 materials for strength and longevity
  • Forged, double tempered and deep cryogenically treated for exceptional toughness
  • Shot peened surfaces for enhanced hardness and fatigue resistance
  • Developed using SolidWorks CAD and Cosmos FEA for optimal gear geometry
  • Race drivetrains with MFactory components routinely show 1 to 2 percent more wheel horsepower than many alternatives
  • Precise fitment for smooth installation and reliable operation

Vehicle applications and gearbox notes

Direct-fit ring and pinion upgrade for the following platforms, replacing the factory 2.81 gearing with a shorter ratio for quicker acceleration:

  • BMW E82 and E88 135i - manual and DCT - OEM 2.81
  • BMW E90 E91 E92 E93 335i and 335d - manual and DCT - OEM 2.81
  • BMW F20 F21 F22 F23 M135i and M235i 2012+ - manual - OEM 2.81
  • BMW F30 F31 335i and 435i 2012+ - manual - OEM 2.81

Note: This listing replaces the standard crownwheel and pinion to produce a noticeably shorter overall gearing effect than the factory 2.81 ratio for the models shown.

Part number

MF-TRS-02E28

Fitting and expert support

Professional installation is recommended. For fitting by specialists, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Compatibility check before dispatch

We confirm fitment on every order. Provide your UK reg or the last 7 of your VIN at checkout and we will verify before shipping.

Manufacturer

MFactory Competition Products

Warranty

For motorsport use only. Supplied with a limited 1-year warranty against defects in materials and workmanship at the time of professional installation. It is the buyer or installer’s responsibility to confirm suitability prior to fitting. Any components used in a running transmission or differential assembly are excluded. Returns require inspection and confirmation of defect by MFactory before credit or replacement is issued.

Search terms people use

BMW diff ratio upgrade, BMW crown wheel and pinion kit, BMW rear axle gears, BMW ring and pinion set, BMW short ratio diff, BMW acceleration gearset, BMW 1 Series 135i gear ratio change, BMW 3 Series 335i gear conversion, BMW 4 Series 435i gear upgrade, BMW M135i shorter gearing, BMW M235i acceleration upgrade, E82 E88 diff gears, E90 E91 E92 E93 ratio change, F20 F21 F22 F23 rear differential gears, F30 F31 final drive ratio swap, N54 twin-turbo gearing, N55 turbo gearing, performance differential gears BMW, street and track BMW diff upgrade, quicker 0-60 BMW turbo, BMW drivetrain upgrade.

View full details