Wavetrac BMW Helical LSD Limited Slip Differential for E46 E82 E90 E92 E93 F30 F31 F32 F33 F36 F10 Z4 - 1/3/4/5 Series - fits 128i 135i 325i 328i 330i 335i 428i 435i 528i 530i 535i - 30.309.175WK

Wavetrac torque-sensing differential for BMW platforms - part no. 30.309.175WK

Put your power to the ground. This Wavetrac gear-driven torque biasing unit transforms rear axle traction and corner exit speed on road and track. Where typical helical diffs act open when a wheel goes light, Wavetrac uses a patented wave-cam device to maintain drive even with near-zero axle load. The result is confident launch performance, reduced inside wheelspin, and consistent grip across kerbs, wet patches and split-mu surfaces.

Built in the USA with 9310 alloy steel gears, case-hardened steel housings and ARP hardware, this clutchless design is quiet, durable and engineered for long service life. No plates to wear, no friction packs to rebuild. Backed by Wavetrac's transferable Limited Lifetime Warranty.

We fit and use these units at MJ Modifications and customer feedback is emphatic: more traction, better stability and faster real-world pace without compromising daily drivability.

Key advantages

• Patented wave-cam keeps torque transfer when a wheel is unloaded for uninterrupted drive
• Gear-driven torque sensing design for smooth engagement and predictable handling
• 9310 alloy steel gearset, case-hardened body, ARP fasteners
• Clutchless construction for low maintenance and long-term reliability
• Designed, developed and manufactured in the USA
• Transferable Limited Lifetime Warranty

Fitment guide

Suitable for a wide range of BMW 1 Series, 3 Series, 4 Series, 5 Series and Z4 applications. Check the ring gear style notes below.

Models with bolted crown wheel

• 1 Series E82 E88: 128i, 135i
• 3 Series E90 E91 E92 E93: 325i, 328i, 330i, 335i
• 3 Series E46: 325i, 328i, 330i
• 5 Series E60: 525i, 528i, 530i, 535i
• 5 Series F10: 528i, 535i
• Z4 E85 E86 E89: 2.5i, 3.0i

Models with welded crown wheel

• 3 Series F30 F31 F34: 328i, 335i automatic 3.15
• 4 Series F32 F33 F36: 428i, 435i automatic 3.15

Notes:
F30 F31 F34 328i - installation kit required
F32 F33 F36 428i - installation kit required
F30 F31 F34 335i automatic - installation kit required
F32 F33 F36 435i automatic - installation kit required

Professional fitting

For a hassle-free install and correct setup, book fitting with MJ Modifications in Warwickshire. We can supply the necessary install kit for welded crown wheel applications and handle bearing preload and backlash adjustment to OE standards. Request a quote: info@mjmodifications.co.uk

Compatibility check

To confirm the correct unit before dispatch, provide your UK registration or the last 7 digits of your VIN at checkout.

Part number

Wavetrac part number: 30.309.175WK

Warranty

Transferable Limited Lifetime Warranty from Wavetrac.

Search terms

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