Wavetrac ATB LSD Differential
- Mfg Part #
- 30.309.155WK 30.309.155WK
- ECS Part #
- ES#4056725
- Brand
-
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Product Details
*Some differentials have a ring gear that is welded to the differential itself that must be removed, drilled, and threaded by a professional machine shop. Please check what differential your BMW has before ordering this product.*
The Wavetrac differential uses a patent-pending design to improve grip in low traction conditions. Precisely engineered, converging / diverging wave profiles are placed on one side gear and its mating preload hub. As the two side gears rotate relative to each other, each wave surface climbs the other, causing them to move apart. This imparts an increased normal force through the side gears, increasing the bias ratio as a function of load. This increase occurs automatically only when conditions find it necessary, and it 'reverts' back to its nominal bias ratio quickly and seamlessly, maintaining optimal drivability and performance at all times. It's like having two differentials in one: you get the benefit of a higher bias ratio when needed without detriment to the car's handling. Designed from a clean sheet, the new Wavetrac Differential brings current gear technology to the market. Internally, its gear tooth forms are optimized for strength and improved oil film retention over competitive designs. Wavetrac's gear package is smaller, reducing overall mass, yet it is more durable. Attention was also paid to the side gear/axle interface, putting as much material thickness as possible in this critical area - most important when power levels get high. Each Wavetrac Differential is crafted from the highest quality materials available. The internal gears are made from high strength 9310 alloy steel. The diff bodies are machined from case hardened steel billet. To complete the package, every Wavetrac differential is built exclusively using high quality, high strength fasteners from ARP, the world leader in fastener technology.
For vehicles with a welded ring gear: This differential requires the welded ring gear from your stock differential to be removed, drilled, and installed at a professional machine shop. Bolt Kit ES4368731 is required to install the ring gear to the new differential. No technical drawings or instructions are provided, please check with your machine shop before purchasing this item and/or the required hardware kit! No refunds or replacements will be offered if the differential has been installed or machined or in the event of incorrect ring gear installation or differential failure due to incorrect installation.
This part does not have vehicle applications yet. For fitment verification, contact our sales team via
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This product is not eligible for Lifetime Replacement
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Free Shipping
Items marked as 'Free Shipping' may qualify for free standard economy ground shipping to the contiguous United States (48 states). Oversized products and direct ship products are excluded from this offer unless otherwise noted.
The policies listed above are subject to change at any time without notice.
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