RacingDiffs BMW Motorsport Gear Ratio Swap Set GKN V2 for E90, E92, and E93 M3

RacingDiffs BMW Motorsport Gear Ratio Swap Set V1 for E36 and E46 M3, E28, E34, E39, E60, E63, E64 M5, E24 M6, and Z4 M

BMW M Gear Ratio Swap Set - M3, M5, M6, Z4M Differential Upgrade

Name: BMW M Gear Ratio Swap Set - M3, M5, M6, Z4M Differential Upgrade
Brand: RacingDiffs
SKU: RD3051
Price: 214.0 EUR
Availability: InStock

RD3051

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214,00€ - 317,00€

Model

E46 M3 ('00 - '05) sold out

E46 M3 ('05 - '06) sold out

E90/E92/E93 M3 sold out

E60 M5

E63/E64 M6 sold out

Z4 M

Qty

BMW M Gear Ratio Swap Set — Complete Installation Kit

Enhance the performance and driving experience of your BMW M3, M5, M6, and Z4 M with the RacingDiffs Gear Ratio Swap Set. The kit includes all essential components to change your differential’s gear ratio with factory-level precision and reliability.

Key Features

Complete kit: All parts required for a precise, repeatable gear-ratio swap—no guesswork.
Performance gains: Tailor acceleration and drivability to your use case (street, track, time attack).
OEM-level precision: Components manufactured to meet or exceed OEM specifications.
Guided install: Step-by-step tutorial + video walkthrough linked below.

What’s in the Box

Adjustment Shim Set — aligns and positions internal components correctly.
Pinion Oil Seal — prevents leaks and maintains optimal lubrication.
Large Pinion Bearing — required to install onto the new pinion from your new gear set.
Crush Sleeve Shim — sets the correct pinion bearing preload.
Pinion Position Shim Set (2.5–3.5 mm) — precise pinion depth adjustment.

Performance Benefits

Stronger acceleration with the right final drive for your build and tracks.
Optimized top-end and gear spacing for your engine’s power band.
Long-term reliability when backlash and preload are set correctly.
Expert support from RacingDiffs if you need guidance selecting shims or ratios.

Technical Specs / Installation Tips

Use case	Gear ratio change on BMW M differentials (see fitment variants below).
Pinion setup	Set pinion depth using the Pinion Position Shim Set (2.5–3.5 mm) and establish correct preload with the Crush Sleeve Shim.
Backlash	Adjust with the Adjustment Shim Set until backlash is within spec; verify gear contact pattern with marking compound.
Sealing	Install the new Pinion Oil Seal; lightly oil lips; ensure no nicks on yoke surface.
Torque notes	Clean threads; apply medium-strength threadlocker on ring-gear bolts; torque in a star pattern per BMW spec.
OEM references	Backlash adjustment shims: 33139065736 (33-13-9-065-736 / 33 13 9 065 736 / 33.13.9.065.736) 33139065737 (33-13-9-065-737 / 33 13 9 065 737 / 33.13.9.065.737)