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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
4.4 ★★★★★
Based on 27 reviews
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Product Reviews
★★★★★ 5
Beautiful book, sweet message
Format: Hardcover
Go ahead and buy it for all the kids you know
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Reviewed in the United States on December 11, 2021
★★★★★ 5
Sensitively written and beautifully illustrated
Format: Hardcover
Why Do We Cry? is an sweetly illustrated and sensitively written book for young readers. Originally published in Spanish in 2018, this English translation released 7th April 2020 from Kids Can Press is 34 pages and available in hardcover and ebook formats.
The book takes the form of a dialogue between a mother and son about why people cry and why it's good to examine and experience negative emotions so we can process them and what function tears (and crying) actually serve physiologically and emotionally. The text by Fran Pintadera (weblink in Spanish) is supported and enhanced beautifully by the nuanced illustrations by Ana Sender.
This would make a superlative reading circle, library group, or classroom read for youngsters. There's a short discussion resource at the back of the book which includes some science based information on tears and the physiological functions they perform.
Learning to process strong emotion in a positive and constructive manner is -vital- for development. I appreciated that the dialogue was sensitively handled and that the author chose to make the child male was a nice touch. I think that this could be a very valuable book *especially* given our current pandemic world situation.
Five stars. Beautiful little book with universal relevance.
Disclosure: I received an ARC at no cost from the author/publisher for review purposes.
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Reviewed in the United States on April 19, 2020
★★★★★ 5
A thoughtful book to normalize tears
Format: Hardcover
I'm a child life specialist I have heard many parents and providers tell kids (and teens) to "stop crying" or "there's nothing to cry about" or some other variation of that hurtful phrase. I now work with children who have a parent with a serious illness and those experiencing grief. Why Do We Cry? is an amazing resource that is relevant to the majority of situations experienced by kids in my practice. It is beautifully illustrated with images that reflect the emotion in the written content. This book embraces the many reasons people cry without overstepping a boundary by trying to explain or justify the feelings. I love the subtlety of normalizing a variety of feelings and the gentle truth that sometimes we cry without knowing why. I highly recommend this book!
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Reviewed in the United States on December 10, 2022
★★★★★ 5
5 Stars!
Format: Hardcover
Mario asks his mother, “Why do we cry?” and she goes on to tell him all the different reasons that we do cry. Some of the reasons are a bit metaphorical, and might be harder for younger children to understand, but the illustrations help in those cases. (The book is aimed for 3-7 year olds, but I think the story is more fitting for ages 5 and up). The illustrations correspond well with the words on the page.
The story lets children know that it is ultimately ok to cry. I feel that the book showcasing a boy asking about crying is wonderful as some boys are told NOT to cry.
A few added pluses:
There is also a lesson that scientifically explains about tears so children can understand some of the varying reasons that tears exist. There is also a small interactive section with activities dealing with tears that will help children express their imagination.
Many thanks to Kids Can Press for granting me an e-arc to read that I chose to review. A+ on this children’s picture book!
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Reviewed in the United States on April 7, 2020
★★★★★ 4
Learn why we cry in this great kids book!
Format: Hardcover, Format: Hardcover
I received a digital copy of this book from the publisher. All thoughts and opinions are my own.
"Some days we cry because we call out for a hug but all we get back is an echo."
Why Do We Cry? begins with a boy asking his mother why we cry. There are many answers to such a question and the mother helps the boy explore the many reasons why we may shed tears.
As the mother explains the reasons why we cry, the illustrations become a bit surreal, to show the emotions and feelings associated with crying, from sadness to anger to grief. The mother compares and contrasts, all the while weaving a poetic story about her own life or memories and emotions.
This book reminds us that it is okay to cry, that crying can be a release, a way to heal, or let go. It helps us understand the difference between emotions and how they affect us.
There's an educational spread at the end of the book that teaches us the different types of tears, one of which--emotional tears-- is featured in this book, what they are made of, and even how much they weigh!
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Reviewed in the United States on June 12, 2020