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BMW LSD 188K – E46, E39, E38, X3, X5, Z4 Limited Slip Differential (330i, 530i, 325i)
RD1010
1.849,00€1.499,00€
Transform your open differential into a real clutch-type LSD
Upgrade your BMW E46, E39, E38, X3, X5 or Z4 with a high-performance 188K Limited Slip Differential (LSD), designed to transform factory open differentials into true traction machines. BMW never equipped these models with a proper LSD from factory, making this upgrade essential for eliminating one-wheel spin and improving grip, stability and performance in all driving conditions.
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
- Plug-and-Play Installation: Direct swap for the stock open carrier — no welding, machining, or special setup required.
- 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 spirited road driving.
- Lifetime warranty and worldwide DHL Express shipping.
Technical Specs / Installation Tips
| Differential types | BMW 188K |
| 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 (for setting backlash & preload) + new OEM-spec side (carrier) 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 188K
Compatible with BMW differentials of type 188K. Grouped by chassis for clarity.
E46 — 3 Series
320Cd M47N · 320d M47 · 320d M47N · 320td M47N · 323Ci M52 · 323i M52 · 323i 2.4 M52 · 325Ci M54 · 325Ci M56 · 325i M54 · 325i M56 · 325ti M54 · 325xi M54 · 328Ci M52 · 328i M52 · 330Ci M54 · 330i M54 · 330xd M57 · 330xd M57N · 330xi M54
E39 — 5 Series
520d M47 · 520i M52 · 520i M54 · 523i M52 · 523i 2.4 M52 · 525d M57 · 525i M54 · 525td M51 · 525tds M51 · 528i M52 · 530i M54 · 535i M62
E38 — 7 Series
725tds M51 · 728i M52 · 728iL M52 · 735i M62 · 735iL M62
E83 — X3
X3 2.5i M54 · X3 3.0d M57N · X3 3.0i M54
E53 — X5
X5 3.0d M57 · X5 3.0d M57N · X5 3.0i M54 · X5 4.4i M62 · X5 4.4i N62 · X5 4.6is M62
E85 / E86 — Z4
Z4 2.2i M54 · Z4 2.5i M54 · Z4 3.0i M54 · Z4 3.0si N52
To confirm your differential’s final-drive (gear) ratio, just look it up in the BMW parts catalog, and follow this quick video guide.
Compatible with BMW E46 320i, 325i, 330i, E39 525i, 530i, E38 728i, X3 E83, X5 E53 and Z4 E85/E86 models equipped with 188K differential. Ideal upgrade for daily driving, drifting, track use and eliminating one-wheel spin in open differential BMWs.
