Fits BMW 188K Axle with final drive ratio over 3.15:
E46 325i, 328i, 330i A/T 1998-2005. E9X 325i, 328i, 330i 2006>. E9X 335i A/T 9/2007>. E8X 135i A/T 2008>. E8X 128i 2008>. E60 525i, 528i, 530i A/T. E8X Z4 2.5i, 3.0i.335i & 135i owners click here for welded ring gear info and for full application list
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. Our gear package is smaller, reducing overall mass, yet 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.