Fits BMW 188K Axle with final drive ratio over 3.15

E46 325i, 328i, 330i A/T 1998-2005. Bolt on Ring gear

E9X 325i, 328i, 330i 2006>.  Some Ring gears could be welded

E9X 335i A/T 9/2007>. Some Ring gears could be welded

E8X 135i A/T 2008>. Some Ring gears could be welded

E8X 128i 2008>. Some Ring gears could be welded

E60 525i, 528i, 530i A/T. Some Ring gears could be welded

E8X Z4 2.5i, 3.0i. Some Ring gears could be welded

All welded OEM gear assemblies require machinework and Installation Kits sold separately. See special notes about these applications

Wavetrac diffs are state-of-the-art helical gear differentials designed, developed, and manufactured in the USA by Autotech Driveline. The Wavetrac Differential is the only torque biasing differential on the market with patented technology that mitigates wheelspin when an unloaded wheel condition arises. During zero axle load conditions, the Wavetrac cam device acts to create internal load, maintaining drive on the gripping wheel instead of acting like an open diff (and going nowhere!). Super strong 9310 alloy steel gears are enclosed in case-hardened steel bodies, held together with ARP fasteners. All Wavetrac differentials include a transferable, Limited Lifetime Warranty.