BMW F10 550i & E90 335D (215K) with welded ring gear

E92 335iS DCT (dual clutch trans) with welded ring gear

E87 135i DCT with welded ring gear

E89 Z4 35i DCT, Z4 35is DCT with welded ring gear

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. 10 BMW M12x1.5x24 bolts 33121205561 or 10 ARP bolts N.M12.150.24 required if performing your own welded ring gear service (already included with our "Install Kit").