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Fully-Forged LSD Unit for BMW 188LW Differential
RD1017
1.849,00€
Transform your open differential into a real clutch-type LSD
BMW never offered a limited-slip differential for the 188LW types from factory — until now. The RacingDiffs All-Solution LSD Unit brings true LSD performance to medium-case differentials with welded crown gear, such as type 188LW.
This drop-in unit replaces your factory open carrier with a fully forged, clutch-type differential core that delivers maximum traction and race-grade reliability — while staying civil on the street. It uniquely combines up to 100% lock under full throttle with zero noise or chatter in tight turns, striking the ideal balance between performance and comfort.
Features
- Clutch-Type LSD Behavior: Smooth, progressive locking for predictable handling and superior grip in all conditions.
- Fully Serviceable Kit: Includes fully forged ramp plates, pressure rings, clutch packs, and preload springs.
- Adjustable Ramp Angles: 30/60, 30/30, 50/65 and other options for street, track, or drift setups.
- Fully Forged Construction: Every internal and external component is fully forged and thermally treated for maximum strength and longevity.
Performance Benefits
- Eliminates the one-wheel-spin problem permanently.
- Maximum traction and perfect corner-exit control.
- 100% lock on demand with silent, seamless operation in sharp turns.
- Improved stability, lap times, and driver confidence.
- Ideal for drift, track days, and high-torque daily driving.
- Lifetime warranty and worldwide DHL Express shipping.
Technical Specs / Installation Tips
| Differential types | BMW 188LW (welded ring gear) |
| Lock type | Clutch-type LSD, fully forged internals |
| Ramp options | 30/60, 30/30, 50/65 |
| Max lock | Up to 100% under full throttle |
| Carrier preload | Set to 1 Nm |
| Backlash | 0.06–0.08 mm at ring gear (measure with dial indicator) |
| Required parts | Backlash Adjustment C-Clip Set + new OEM-spec side oil seals + bearings (optional) |
- Ring-gear bolts: clean threads, apply medium-strength thread locker, and torque to 140 Nm in a star pattern.
Fitment — BMW 188LW
Compatible with BMW differentials of type 188LW (welded ring gear). Ordered by chassis.
F20 / F21 — 1 Series
120d N47N · 120dX N47N · 125i N20 · M135iX N55
Facelift (LCI):
120d B47 · 120dX B47 · 125i N20 · M135iX N55
F22 / F23 — 2 Series
220d N47N · 220d B47 · 220dX B47 · 228i N20 · 228i N26 · M235iX N55
F23 Convertible:
220d B47 · 228i N20 · 228i N26 · M235iX N55
F30 / F31 — 3 Series
320d N47N · 320d ed N47N · 320dX N47N · 320iX N20 · 328d N47N · 328dX N47N · 328i N20 · 328i N26 · 328iX N20 · 328iX N26 · 335i N55 · 335iX N55 · Hybrid 3 N55
Facelift (LCI):
320d B47 · 320d N47N · 320d ed B47 · 320dX B47 · 320i B48 · 320iX B48 · 320iX N20 · 328d N47N · 328dX N47N · 328i N20 · 328i N26 · 328iX N20 · 330e B48X · 330i B48 · 340iX B58
F34 / F35 — 3 Series GT / Long Wheelbase
F34: 320d N47N · 320d B47 · 320dX N47N · 320dX B47 · 320iX N20 · 328i N20 · 328i N26 · 328iX N20 · 335i N55 · 335iX N55
F35: 328Li N20 · 335Li N55
F32 / F33 / F36 — 4 Series
420d N47N · 420d B47 · 420dX N47N · 420dX B47 · 420i B48 · 420iX N20 · 420iX B48 · 428i N20 · 428i N26 · 428iX N20 · 428iX N26 · 430i B48 · 435i N55 · 435iX N55 · 440iX B58
F33 Convertible:
420d N47N · 420d B47 · 420i N20 · 420i B48 · 428i N20 · 428i N26 · 430i B48 · 435i N55 · 435iX N55 · 440iX B58
F36 Gran Coupé:
420d B47 · 420dX B47 · 420dX N47N · 420i B48 · 420iX N20 · 428i N20 · 428i N26 · 430i B48 · 435i N55 · 435iX N55 · 440iX B58
To confirm your differential’s final-drive (gear) ratio and housing type, check the BMW parts catalog and follow this quick video guide.
