Wavetrac Limited Slip Differential BMW 335is (E92) / 135i (E8X) / 550i (F10) 215K Axle Rear 2.35-2.81 Welded Ring Gear

Wavetrac Limited Slip Differential - BMW 335is (E92) / 135i (E8X) / 550i (F10) - 215K Axle Rear 2.35-2.81 Welded Ring Gear

The Wavetrac is a helical gear, torque-biasing limited slip differential that directly replaces the factory differential for the BMW 335is DCT (E92), 135i (E8X), 550i (F10) and 335d (E90) with the 215K rear axle and welded ring gear. Unlike conventional helical LSDs, Wavetrac's patented design keeps driving the wheel with grip even when the other wheel is unloaded or in the air - where other helical diffs behave like an open diff. There are no clutch packs to wear, adjust or rebuild.

Note: For the 215K axle with the welded OEM ring gear and a final drive ratio of 2.35 to 2.81. Also listed for the E90 335d and the E92 335is with DCT. Machining work is required and installation kits are sold separately.

Fitment & Identification

• Vehicles: BMW 335is DCT (E92); BMW 135i (E87 / E8X); BMW 550i (F10); BMW 335d (E90)
• Gearbox / axle: 215K Axle (welded ring gear)
• Position: Rear
• 215K axle with welded ring gear
• Final drive ratio 2.35-2.81 - check the ratio stamped on your diff or in your vehicle build data
• Welded OEM ring gear - machining required; installation kits sold separately

Please confirm your gearbox or axle code, final drive ratio and model year before ordering. If you are unsure, send us your VIN and gearbox/axle code and we will confirm fitment.

What's Included

• Wavetrac differential assembly (carrier with internal gear set) - ready to accept your factory ring gear

What You'll Also Need

• Your factory ring gear, machined from the welded factory differential
• Installation kit (sold separately) - required
• New carrier bearings are recommended when the differential is changed
• Gear oil to factory specification (see below)

Installation

Installation by a professional driveline specialist is always recommended. This application uses a welded OEM ring gear assembly, so machining work is required and an installation kit (sold separately) is needed. Torque the ring gear bolts to 115 Nm (85 ft-lb). Backlash and bearing preload are set to factory specification. No break-in is required for the Wavetrac itself - follow the break-in procedure only if a new ring and pinion is fitted at the same time.

Gear Oil

• Use the gear oil specified by your vehicle manufacturer - the Wavetrac is compatible with virtually all factory-fill gear oils
• Avoid gear oils with limited slip (friction modifier) additives - they reduce the friction a helical differential relies on
• Do NOT use Red Line ShockProof or similar oils - this voids the Wavetrac warranty
• For racing, Wavetrac recommends Motul synthetic high-performance gear oils

Strength & Maintenance

Wavetrac differentials use high-strength 9310 alloy steel gears in case-hardened billet or forged steel housings, assembled with ARP fasteners. In almost any gearbox or axle, the Wavetrac is not the limiting factor in torque capacity. There is no scheduled maintenance and no rebuilds are required.

Warranty

Wavetrac limited lifetime warranty against defects in manufacture, material, workmanship and wear-out, when used in the application it was designed for - including racing - and transferable to subsequent owners. Excludes differentials that are incorrectly installed, fitted to the wrong application, modified, or run in ShockProof-type oil. Proof of purchase from an authorised Wavetrac dealer is required.

Specifications

• Type: Helical gear torque-biasing limited slip differential
• Position: Rear
• Gearbox / axle: 215K Axle (welded ring gear)
• Drivetrain: 2WD (RWD)
• Axle: 215K
• Ring gear: Welded OEM ring gear - machining required
• Ring gear bolt torque: 115 Nm (85 ft-lb)
• Final drive ratio: 2.35-2.81
• Engine (reference): N54B30 (135i / 335is)
• Gears: 9310 high-strength alloy steel
• Housing: Case-hardened billet or forged steel
• Fasteners: ARP
• Maintenance: Maintenance free — no rebuilds required
• Warranty: Wavetrac limited lifetime warranty
• Made in: USA
• Part number: 30.309.172WK

Need help confirming the right Wavetrac for your car? Contact our team at sales@chicaneaustralia.com.au.