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Description
diff gear ratio BMW M Gear Ratio Swap Set | M3, M5, M6, Z4M Differential UpgradeBMW M Gear Ratio Swap Set Complete Installation Kit Enhance the performance and driving experience of your BMW M3, M5, M6, and Z4 M with the RacingDiffs Gear Ratio Swap Set. The kit includes all essential components to change your differentials gear ratio with factory level precision and reliability. Key Features Complete kit: All parts required for a precise, repeatable gear ratio swapno guesswork. Performance gains: Tailor acceleration and
BMW M Gear Ratio Swap Set — Complete Installation Kit
Enhance the performance and driving experience of your BMW M3, M5, M6, and Z4 M with the RacingDiffs Gear Ratio Swap Set. The kit includes all essential components to change your differential’s gear ratio with factory-level precision and reliability.
Key Features
- Complete kit: All parts required for a precise, repeatable gear-ratio swap—no guesswork.
- Performance gains: Tailor acceleration and drivability to your use case (street, track, time attack).
- OEM-level precision: Components manufactured to meet or exceed OEM specifications.
- Guided install: Step-by-step tutorial + video walkthrough linked below.
What’s in the Box
- Adjustment Shim Set — aligns and positions internal components correctly.
- Pinion Oil Seal — prevents leaks and maintains optimal lubrication.
- Large Pinion Bearing — required to install onto the new pinion from your new gear set.
- Crush Sleeve Shim — sets the correct pinion bearing preload.
- Pinion Position Shim Set (2.5–3.5 mm) — precise pinion depth adjustment.
Performance Benefits
- Stronger acceleration with the right final drive for your build and tracks.
- Optimized top-end and gear spacing for your engine’s power band.
- Long-term reliability when backlash and preload are set correctly.
- Expert support from RacingDiffs if you need guidance selecting shims or ratios.
Technical Specs / Installation Tips
| Use case | Gear ratio change on BMW M differentials (see fitment variants below). |
| Pinion setup | Set pinion depth using the Pinion Position Shim Set (2.5–3.5 mm) and establish correct preload with the Crush Sleeve Shim. |
| Backlash | Adjust with the Adjustment Shim Set until backlash is within spec; verify gear contact pattern with marking compound. |
| Sealing | Install the new Pinion Oil Seal; lightly oil lips; ensure no nicks on yoke surface. |
| Torque notes | Clean threads; apply medium-strength threadlocker on ring-gear bolts; torque in a star pattern per BMW spec. |
| OEM references | Backlash adjustment shims: 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) |
Tip: Always re-check preload/backlash after first heat cycle or track day.
Fitment (Variants)
Variant 1 (V1):
- E36 M3 (3.2 S52)
- E46 M3
- E28 M5, M535
- E34 M5
- E39 M5
- E24 M6
- E60 M5
- E63 / E64 M6
- Z4 M
Variant 2 (V2):
- E90 / E92 / E93 M3
If you’re unsure about compatibility, send us the last 7 digits of your VIN and we’ll confirm the right set for your car.
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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★★★★★ 5
Love this bra
Comfortable and held breast when the should be.
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Reviewed in the United States on May 24, 2026
★★★★★ 5
Highly Recommended
42G fit perfect and comfortable definitely recommend for a bigger bust
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Reviewed in the United States on February 27, 2026
★★★★★ 5
Good
Color: Black, Size: 36D
Super comfy and shape is nice gives you a smooth back
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Reviewed in the United States on May 30, 2026
★★★★★ 5
In LOVE
I have had so many issues finding bras that will fit. I'm picky with sensitive skin and a general hate for having to wear bras of any kind. I also I struggle with body dysmorphia and go between tolerance/hate of my tatas. Being a 40DDD is not fun with these issues, but I've found that wearing minimizer bras vs trying to bind to hide has been better for my overall self image (and way more comfortable). So I have looked high and low for different bras that support me, are attractive, and don't break the bank. This is IT. It's very sexy while working as an everyday bra and my partner LOVES the sheer and little strappy detailing. It supports just how I need it and has honestly given me some confidence back. I can't wait to keep coming back for this bra. Please keep this in stock lol.
Sum up of the details that win me over: The overall look is sexy, its very soft, the banding is wide and does not dig into me (also has like 4 hooks?), the underwire is near perfect in that it supports and doesn't tend to dig unless it works its way up some, and it gives me a lovely shape that I don't normally have with how low I tend to hang, I fully fit in the cups (bell shaped, wide set) with no spillage.
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Reviewed in the United States on April 16, 2023
★★★★★ 3
Not very comfortable
Color: Black, Size: 42D
Just okay. Provides support but doesn’t particularly minimize and isn’t very comfortable.
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Reviewed in the United States on May 31, 2026
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