BMW bolt type Differential Backlash adjustment shim kit – 188 mm, E21
BMW bolt type Differential Backlash adjustment shim kit – 188 mm, E21, RacingDiffs part no. RD3003, RD3005. A RacingDiffs part for differential rebuilds, gear ratio swaps and LSD setup.
Key Features
- Broad compatibility: Works with BMW 168 mm , 188 mm , and 210 mm differentials (E21, E28, E30, E36, E34, E32, E31, Z3).
- Precision-centric: 10 shims ranging 1.0–2.0 mm in 0.1 mm increments for accurate backlash setup.
- Noise prevention: Correct backlash eliminates whine and protects ring-and-pinion from premature wear.
- Motorsport-grade repeatability: Fine steps reduce trial-and-error and make reassembly consistent.
Technical Specs
| Spec | Value |
|---|---|
| Kit contents | 10× precision shims, 1.0–2.0 mm (0.1 mm increments). |
| Intended use | Carrier shim selection to set backlash and bearing preload after LSD or ring/pinion changes. |
| Measurement | Use a dial indicator at the ring gear to set backlash to BMW spec; verify tooth contact with marking compound. |
| Best practices | Record shim stacks during trials; torque fasteners per BMW spec; rotate and re-measure after seating bearings. |
Fitment
- E21
- E28
- E30
- E36
- E34
- E32
- E31
- Z3
Versions
| Size | Part number |
|---|---|
| 188 mm | RD3003 |
| E21 | RD3005 |
Specifications
| Spec | Value |
|---|---|
| Brand | RacingDiffs |
| Part number | RD3003, RD3005 |
| Version | 188 mm, E21 |
| Weight | 0,8 kg |
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 bolt type Differential Backlash adjustment shim kit – 188 mm, E21
197.23€
Excl. VAT: 163.00€
Tags: RS-RD-RD3003,