Wavetrac ATB LSD - E38/E39/E46/E60/E90/F21 DIESEL (215K) BOLTED OEM RING GEARS R=2.35-2.81

Helical limited slip differential upgrade for BMW diesel platforms with bolt-on crown wheel

Part number: 215K

Unlock sharper corner exits, stronger traction and consistent power delivery with this Wavetrac helical limited slip differential. Built for fast road and track-day use, it keeps drive going to the tyre with grip even when the inside wheel goes light over kerbs or on slick surfaces. The result is predictable handling, quicker lap-to-lap pace and confidence when you lean on the throttle.

Why choose this Wavetrac unit

• Delivers drive when one axle is unloaded for steady, repeatable acceleration out of bends
• Works seamlessly with factory stability and traction systems during day-to-day driving
• Smooth power transfer at the limit for progressive, confidence-inspiring behaviour
• Carbon fibre bias plates maintain performance consistency over the life of the unit
• Premium internals: 9310 steel gearset in billet or forged steel housings
• ARP fasteners used throughout for long-term reliability
• Engineered and manufactured in the USA

We run Wavetrac on our own builds and customer cars. Feedback is consistently excellent, with owners praising the added grip, stability mid-corner and the smooth way it puts power down.

Vehicle compatibility

Suits BMW diesel models using a bolt-on crown wheel and compatible final drive ratios. Confirmed applications include:

• E60 525d up to 03/2007, 530d, 535d
• E46 330d manual
• E39 530d manual
• E38 740d
• E90 325d manual up to 03/2007, 330d manual up to 01/2007
• F21 125d automatic
• F32 430d with 2.56 final drive

Compatible with bolt-up crown wheel units covering approximately 2.35 to 2.81 final drive ratios. Please confirm your rear axle specification before ordering.

How it improves your drive

Conventional gear-type differentials lose effectiveness when a wheel goes light. Wavetrac’s patented internal system generates load across the differential when that happens, sending torque to the wheel that can actually use it. You get more consistent acceleration through and out of corners without the pushy understeer traits of clutch-pack diffs.

Ideal for

• Fast road builds seeking stronger rear-end traction
• Track days where inside-wheel lift over kerbs is common
• Drivers wanting a fit-and-forget performance differential that stays consistent

Professional fitting

For installation, we recommend our in-house team at MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a tailored fitting quote and setup advice.

Wavetrac. Smooth is fast.