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Customizable BMW LSD Type 188K for E46, E39 & Z4 (E85) - Ready-to-Mount
RD1008
3.045,00€ - 3.990,00€
Fully Adjustable BMW 188K Limited Slip Differential
For E46, E39 and Z4 (E85)
Transform your BMW with a fully adjustable clutch-type LSD built for both road and competition. Dial lock from a mild ~25% up to a welded-like 100% (setup-dependent) to match circuit, rally, hill climb, drift, drag, time-attack or daily street use. Each unit is assembled with a brand-new fully-forged LSD core, new bearings and oil seals, then finished in a sandblasted & painted housing for durability.
Key Benefits
- Adjustable lock range: tune from ~25% to 100% (setup-dependent) for your discipline and surface.
- Race-ready manners: smooth, progressive engagement for predictable balance and corner-exit traction.
- Complete, ready to install: forged LSD core, new bearings & seals, refinished housing.
- Personalization: choose housing type, ratio, finish color, laser-engraved cover, ramp profile and clutch count.
- Future-proof: re-shim/re-ramp as your build evolves—no need for multiple differentials.
Track / Street Drift Drag Time Attack Hill Climb
Technical Specs / What’s Included
| Diff type | BMW 188K (medium case) |
|---|---|
| Core | Fully-forged, clutch-type LSD (new) |
| Adjustability | Lock from ~25% to 100% via ramp & clutch setup (setup-dependent) |
| Kit contents | Forged LSD core, new carrier & pinion bearings, new oil seals, sandblasted & painted housing |
| Customization | Ramp angles, active clutch count, housing type, ratio, color, laser engraving |
| Lead time | Custom-assembled to order — typically ~2 weeks |
- Installation: bolt-in to 188K housings; set backlash & preload to BMW spec; torque ring-gear bolts with thread-locker.
- Oil: quality 75W-140 GL-5 LSD oil recommended after bedding-in. Our recommendation is Ravenol Racing
Fitment — BMW E46 / E39 / Z4 (E85) with 188K
Compatible with the following models using the 188K differential:
BMW E46
318d (M47, M47N) · 318td (M47N) · 320Cd (M47N) · 320Ci (M54) · 320d (M47, M47N) · 320i (M54) · 320td (M47N) · 323Ci (M52) · 323i (M52, 2.4L M52) · 325Ci (M54, M56) · 325i (M54, M56) · 325ti (M54) · 325xi (M54) · 328Ci (M52) · 328i (M52) · 330Ci (M54) · 330i (M54) · 330xd (M57, M57N) · 330xi (M54)
BMW E39
520d (M47) · 520i (M52, M54) · 523i (M52, 2.4L M52) · 525d (M57) · 525i (M54) · 525td (M51) · 525tds (M51) · 528i (M52) · 530i (M54) · 535i (M62)
BMW Z4 (E85)
Z4 2.2i (M54) · Z4 2.5i (M54) · Z4 3.0i (M54)
Tip: Unsure about your diff type/ratio? Check the BMW parts catalog with your VIN and verify 188K.
Ordering Notes
- Please provide your VIN, current final-drive ratio, and any preference for ramp angles / clutch count.
- Laser-engraved rear cover text/logo available on request.
- Built-to-order item; typical ~2 weeks assembly time.
