BMW LSD 188K – E46, E39, E38, X3, X5, Z4 Limited Slip Differential
BMW LSD 188K – E46, E39, E38, X3, X5, Z4 Limited Slip Differential, RacingDiffs part no. RD1010, RD1011, RD1012. It is a complete clutch-type limited slip differential unit that replaces the open or worn factory differential carrier.
Key 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 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.
Technical Specs
| Spec | Value |
|---|---|
| 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) |
Installation Notes
- Ring-gear bolts: clean threads, apply medium-strength thread locker, and torque to 140 Nm in a star pattern.
Fitment
Compatible with BMW differentials of type 188K. Grouped by chassis for clarity.
Versions
| Gear ratio | Part number |
|---|---|
| Low range (2.37 - 2.87) | RD1010 |
| Mid range (2.93 - 3.07) | RD1011 |
| High range (3.15 - 4.45) | RD1012 |
Specifications
| Spec | Value |
|---|---|
| Brand | RacingDiffs |
| Part number | RD1010, RD1011, RD1012 |
RacingDiffs
Founded in Belgium, RacingDiffs is a specialist developer of limited slip differential conversions and upgrades for popular rear-wheel-drive platforms. Their bolt-in LSD kits convert open differentials into performance units without a full housing swap — a cost-effective solution for track day and drift enthusiasts seeking better traction and balance.
Official page: racingdiffs.com
Official page: racingdiffs.com
BMW LSD 188K – E46, E39, E38, X3, X5, Z4 Limited Slip Differential
1,692.79€
Excl. VAT: 1,399.00€
Tags: RS-RD-RD1010,