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Description
bmw gear ratios BMW Differential Gear ratio Swap set - Essential for smooth gear ratio changeBMW Gear Ratio Swap Set Complete Installation Kit (168 188 210 mm) Thinking of changing the gear ratio of your BMW differential? The RacingDiffs Gear Ratio Swap Set includes all essential components to complete a precise, reliable swap and unlock better acceleration, drivability, and overall performance. Key Features Complete kit: Everything required for a seamless gear ratio change with factory level precision. Performance gains: Tailor acceleration,
BMW Gear Ratio Swap Set — Complete Installation Kit (168 / 188 / 210 mm)
Thinking of changing the gear ratio of your BMW differential? The RacingDiffs Gear Ratio Swap Set includes all essential components to complete a precise, reliable swap and unlock better acceleration, drivability, and overall performance.
Key Features
- Complete kit: Everything required for a seamless gear ratio change with factory-level precision.
- Performance gains: Tailor acceleration, top speed and gear spacing to your driving style and tracks.
- OEM-grade quality: Components meet or exceed OEM specs for durability and long service life.
What’s in the Box
- Adjustment Shim Set / C-Clip Set — ensures proper alignment and backlash adjustment.
- Pinion Oil Seal — maintains lubrication and prevents leaks.
- Large Pinion Bearing — to press onto the new pinion gear.
- Crush Sleeve Shim — for setting correct pinion preload.
- Pinion Depth Shim Set (3.3–3.7 mm) — precise pinion depth positioning.
Performance Benefits
- Stronger acceleration with shorter final drives; or reduced cruising RPM with taller ratios.
- Improved drivability by matching ratio to engine power band and tire diameter.
- Long-term reliability when preload/backlash are set correctly during assembly.
- Expert support — guides and resources to help you complete the swap confidently.
Fitment Confirmation
- Use the BMWFans.info database: Follow this guide video to identify your differential type and parts: How to check diff type.
- VIN check: Send us the last 7 digits of your VIN and we’ll confirm the correct set for your car: Contact RacingDiffs.
Works with common BMW differential sizes: 168 mm, 188 mm, and 210 mm. Verify exact application before ordering.
Technical Specs / Installation Tips
| Pinion depth | Set using the Pinion Depth Shim Set (3.3–3.7 mm). Verify with contact pattern. |
| Pinion preload | Establish with the Crush Sleeve Shim per BMW specs (feel for smooth rotation, no end play). |
| Backlash | Adjust via Adjustment Shim / C-Clip Set until within spec; measure at ring gear with a dial indicator. |
| Sealing | Install the new Pinion Oil Seal; lightly oil lips; inspect yoke surface for grooves. |
| Fasteners | Clean threads, apply medium-strength threadlocker to ring-gear bolts, torque in a star pattern to BMW spec. |
Re-check preload and backlash after the first heat cycle or track session.
OEM Cross-References (Backlash Adjustment 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 |
If you’re unsure about compatibility, send us the last 7 digits of your VIN and we’ll confirm the correct set for your build.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Product Reviews
★★★★★ 5
Long lasting
Flavor Name: Y-Gnawt, Size: Large
It's been 15 minutes and my dog is still chewing which never happens. She destroys everything within a few minutes. Everything! The coating is gone but she's still happy. No staining and she's eating it on the carpet.
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Reviewed in the United States on May 16, 2026
★★★★★ 4
Good brand! 💯 for aggressive chewers & Long lasting.
Flavor Name: Antler, Size: Large, Flavor Name: Antler, Size: Large
Honestly Five Stars! 🤩 But Toys could always be improved. My boys Loves Honest chew! 🤍 it's about the Second to third Toy/ Bone 🦴 that is Good & long-term lasting. For My Pit mix & Border collie. Pit mix has a very strong jaw and gotta keep my Border Collie busy! We have Four other bones, they use everyday & keep them busy. Definitely Worth the money! It's easy but watch that first Day! It's messy. Please be careful! of your dog has sensitive stomachs. Always Supervise your fur babies! 🦺 Theses are Toys/ bones, they DON'T last forever. Has they wear down, Please replace them with New ones! 🐶🫶🏾 Thank You Honest chew! We're definitely buy again.
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Reviewed in the United States on April 29, 2026
★★★★★ 2
Vomit Inducing
Flavor Name: Antler, Size: Small
My little doggo eats anything and everything and without any ill effects. But the “meaty” gelatinous coating on this chew did her in. After her first 15 minutes of chewing it she was non-stop vomiting on our carpet (that was stained to boot). So sorry to have put her through this. Be advised. Rather than return it I deposited its messy, disgusting remnants in the garbage pail.
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Reviewed in the United States on June 1, 2026
★★★★★ 5
This is amazing, it makes my frenchie so happy!
Flavor Name: Y-Gnawt, Size: Medium, Flavor Name: Y-Gnawt, Size: Medium
Our frenchie loves this. She has been chewing on it for over an hour now. She's gotten most of the meat off and is working on the chew now. She is super happy right now. Be sure to give it to your dog on a hard surface that's easy to clean. The package suggests this and it's true. Can be a bit messy at first.
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Reviewed in the United States on May 19, 2026
★★★★★ 3
The Meat is a Messy Covering
Flavor Name: Antler, Size: Medium
My dog really enjoys this chew, and I was surprised how meaty it was when I took it out of the package. However, the meat is just a covering and quickly flakes off. She finished the meaty part in about 20 minutes and it was messy! The underlying antler has some criss/cross lines, where meat particles get stuck, so it keeps her interest. Otherwise, once the meat covering is off, it's the same as the original Honest Chew antler.
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Reviewed in the United States on May 24, 2026