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BMW bolt type Differential Backlash adjustment shim kit
RD3002
149,00€ - 174,00€
RacingDiffs Precision Shim Kit — BMW Differential Backlash Adjustment (168 / 188 / 210 mm)
When integrating an LSD or changing final drive ratios, precise backlash and carrier preload are critical. The RacingDiffs Precision Shim Kit delivers the fine, repeatable adjustment you need for silent, long-life operation.
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.
Performance Benefits
- Quiet, durable operation after LSD installs or ratio changes.
- Improved gear life by keeping contact pattern within spec.
- Faster setup thanks to predictable 0.1 mm steps.
Technical Specs / Installation Tips
| 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. |
Note: Backlash/preload targets vary by differential family—follow BMW service specs for your chassis.
Fitment (Typical BMW Platforms)
- E21
- E28
- E30
- E36
- E34
- E32
- E31
- Z3
If you’re unsure about your differential size (168/188/210), send us your VIN and we’ll confirm before you order.
OEM Cross-References (Backlash Shims)
| Diff Size | OEM Part Numbers |
|---|---|
| 168 mm | 33139065731 / 33-13-9-065-731 / 33 13 9 065 731 / 33.13.9.065.731 33139065732 / 33-13-9-065-732 / 33 13 9 065 732 / 33.13.9.065.732 33139065733 / 33-13-9-065-733 / 33 13 9 065 733 / 33.13.9.065.733 |
| 188 mm | 33139065734 / 33-13-9-065-734 / 33 13 9 065 734 / 33.13.9.065.734 33139065735 / 33-13-9-065-735 / 33 13 9 065 735 / 33.13.9.065.735 |
| 210 mm | 33139065736 / 33-13-9-065-736 / 33 13 9 065 736 / 33.13.9.065.736 33139065737 / 33-13-9-065-737 / 33 13 9 065 737 / 33.13.9.065.737 |
Every BMW enthusiast understands the value of precise setup. With RacingDiffs, you’re not just adjusting—you’re tuning to perfection.
