Wavetrac ATB Helical LSD Differential for BMW 335i E90/E91/E92/E93 (to 03/2007), 540i E39 & Z8 E52 - 215K Bolt-On Ring Gear/Crownwheel - Drop-In Rear Diff Upgrade - Torque-Biasing Limited Slip - Part 30.309.170WK

Wavetrac torque-biasing diff for BMW 335i E9X, 540i E39 and Z8 E52 Part 30.309.170WK

Transform the way your BMW puts power to the ground with this Wavetrac helical gear diff unit. Engineered for BMW applications using the 215K bolt-on crownwheel, it is a direct-fit upgrade for E9X 335i models up to March 2007, the E39 540i and the E52 Z8. Built in the USA by Autotech Driveline, this performance differential delivers confident traction, sharper corner exit and predictable handling for fast road and track day use.

Unlike conventional gear-type units that can act like an open diff when an axle goes light, Wavetrac uses a patented cam and wave mechanism to maintain drive when one side is near zero load. That means you keep pushing forward over kerbs, crests and slick surfaces, with power sent to the tyre that can actually use it.

Why this drivetrain upgrade stands out

• Patented wave cam technology helps maintain drive when an inside wheel unloads, reducing inside-wheel spin and one-tyre-fire.
• Carbon fibre bias plates provide stable, repeatable behaviour across the life of the unit.
• 9310 alloy steel gears housed in case-hardened bodies for serious durability under hard use.
• ARP fasteners throughout for strength you can trust.
• Helical, torque-biasing design with no clutch packs to wear, no friction plates to service.
• Limited Lifetime Warranty from Wavetrac.
• Direct-fit for 215K bolt pattern crownwheels. No machining required and no install kit needed for this application.

Fitment

For BMW petrol models with 215K bolt-on crownwheel:

• BMW 3 Series E90 E91 E92 E93 335i, manual and automatic, up to 03/2007
• BMW 5 Series E39 540i
• BMW Z8 E52

Real-world gains

We have installed and run Wavetrac units on our builds and customer cars. The feedback mirrors our own experience improved grip in wet and dry conditions, stronger corner exit, a more planted rear end and consistent performance on fast road and track days.

Installation and support

Professional fitting is recommended. For supply and installation, choose MJ Modifications in Warwickshire. Request a fitting quote at info@mjmodifications.co.uk.

To confirm compatibility before dispatch, add your UK registration or the last 7 of your VIN at checkout.

Built to perform and last

Every unit is engineered with premium materials and hardware for long-term reliability, backed by Wavetrac’s Limited Lifetime Warranty. No clutch plates means minimal maintenance and consistent torque-biasing behaviour.

Part number

30.309.170WK

Manufactured by

Wavetrac by Autotech Driveline, USA

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