BMW 407-999943 Transmission Torque Converter 2/3 28I

( Part Type: Torque Transmission Converter ), ( Donor Year: 2013 ), ( Ipn: 407-999943 ), ( Miles: 53, 421 ), ( Tag: V51927 )

Review BMW 2/3 Series 28i Transmission Torque Converter fits X1 Z4 F10 F30 F32 2012–2018

The **BMW 407-999943 Transmission Torque Converter** is a high-performance, precision-engineered component designed exclusively for BMW s **N63B40D30** and **N55B30D30** inline-six turbocharged engines, covering a broad spectrum of models from the **F10 5-Series (2010 2017), F30 3-Series (2012 2017), and F32 4-Series (2013 2016)**, as well as the **Z4 (F10/F12/F13) in 28i guise**. This torque converter is meticulously crafted to deliver optimal power transfer, enhanced throttle response, and improved efficiency while maintaining the integrity of BMW s sophisticated automatic transmission systems. Engineered with a **robust single-pump design**, it features a **high-capacity stator and turbine assembly**, ensuring seamless engagement and reducing slippage under heavy loads critical for the aggressive torque delivery of these turbocharged engines. The converter is built with **high-grade aluminum and reinforced steel components**, resistant to warping and wear, making it ideal for both daily driving and spirited performance applications. Its **optimized fluid dynamics** minimize pump loss, allowing for quicker shifts and reduced fuel consumption, while the **precision-balanced impeller** enhances overall transmission longevity. Whether installed in a **high-mileage vehicle requiring a rebuild or a performance-oriented setup seeking improved torque multiplication**, this torque converter is a direct-fit replacement that restores factory-like performance without compromising reliability. Its compatibility with **Getrag GS600B6 automatic transmissions** ensures seamless integration, making it a trusted choice for BMW enthusiasts and professional mechanics alike.

### **Pros and Cons of Buying a BMW 4 Series (F10/F30/F32) 28i (2012 2018) with a Torque Converter Transmission**

#### **Pros**

1. **Strong Engine and Performance**

- The **N55 3.0L inline-6 (28i)** produces **258 300 hp** (depending on model year) and **258 lb-ft of torque**, delivering strong acceleration and a sporty driving experience.

- The engine is **reliable for its class** if well-maintained, with fewer issues than earlier BMW inline-6 engines (e.g., N52).

- The **torque converter automatic transmission (ZF 6HP21)** provides smooth shifting and better fuel economy than a manual, though it lacks the direct engagement of a dual-clutch (e.g., ZF 8-speed in later models).

2. **Luxury and Comfort**

- BMW s **iDrive infotainment system** (though outdated by modern standards) offers a premium feel with Bluetooth, USB, and navigation (if equipped).

- **High-quality interior materials** (leather, wood/aluminum trim in higher trims) and **refined ride quality** make it a comfortable grand tourer.

- **Good sound insulation** reduces road noise, contributing to a quieter cabin.

3. **Resale Value and Brand Prestige**

- BMWs retain **strong resale value**, especially well-maintained examples.

- The **4 Series (F10/F30/F32) is a recognizable luxury sedan/sport wagon**, appealing to buyers who value brand reputation.

4. **Reliability (If Maintained Properly)**

- The **N55 engine is durable** if **oil changes are done on schedule** (every 7,500 10,000 miles) and **coolant levels are monitored** (to prevent overheating).

- **Transmission issues are rare** in the ZF 6HP21 automatic, though **fluid changes are critical** (every 60,000 miles or as recommended).

- **Suspension and steering** are generally robust, though **struts and bushings** may wear over time.

5. **Versatility (F32 Touring Wagon Option)**

- The **F32 Touring** offers **practicality** (more cargo space than the F10 sedan) while retaining the same performance and luxury.

- The **Z4 (F32) is a convertible**, providing an open-air driving experience if you prefer a roadster.

6. **Aftermarket and Modding Potential**

- The **N55 is a popular engine for tuning**, with aftermarket support for **turbo upgrades, exhaust, and suspension modifications**.

- **Performance chips (e.g., MHD, BMS)** can improve throttle response and power.

---

#### **Cons**

1. **High Maintenance Costs**

- BMWs are **expensive to repair**, with **labor costs often 2 3x higher** than average.

- **Oil consumption** (N55 engines may burn oil if not maintained; check for **blue smoke**).

- **Water pump failures** (often linked to **coolant leaks**; replace every **60,000 100,000 miles**).

- **Suspension wear** (struts, bushings, and control arms degrade over time).

- **Electrical gremlins** (iDrive glitches, sensor failures, infotainment lag).

2. **Transmission and Drivetrain Concerns**

- While the **ZF 6HP21 automatic is reliable**, **transmission fluid must be changed regularly** (BMW recommends **every 60,000 miles**; neglecting this can lead to **rough shifting or failure**).

- **Differential and driveshaft wear** can occur, especially in **harsh driving conditions**.

- **Torque converter issues** (e.g., slipping, overheating) are rare but possible if fluid is neglected.

3. **Outdated Technology**

- The **iDrive system (especially in older models) can be slow and glitchy**, with **limited smartphone integration** compared to modern BMWs.

- **No Apple CarPlay/Android Auto** (unless aftermarket solutions are installed).

- **Rear visibility is poor** (especially in the F10 sedan), making parking and reversing difficult.

4. **Fuel Economy is Average for a Luxury Car**

- The **N55 28i gets 18 22 MPG combined**, which is **better than a V8 but worse than modern turbocharged 4-cylinders**.

- **Diesel options (N57) are more efficient** but have **higher maintenance costs** (DPF, EGR issues).

5. **Depreciation and Market Saturation**

- The **4 Series has been around for decades**, meaning **supply is high and prices are competitive**.

- **Newer BMWs (e.g., G30 4 Series, F40 M4) offer better tech and efficiency**, making older models less desirable to some buyers.

6. **Potential Hidden Issues**

- **Carbon buildup in intake valves** (common in BMWs; requires **intake valve cleaning every 60,000 100,000 miles**).

- **Exhaust manifold cracks** (especially on **left-side manifolds** due to heat).

- **Power steering pump failures** (can cause **hard steering or whining noises**).

- **Rust in lower control arms** (common in **salted climates**).

7. **Resale Value Drop**

- While BMWs hold value better than most, **a 2012 2018 model will lose significant equity** over time, especially if not well-maintained.

- **Later models (2016 ) may have better tech**, but **earlier years (2012 2014) have more known issues**.

---

### **Ending Conclusion**

The **BMW 4 Series (F10/F30/F32) 28i (2012 2018) with an automatic torque converter transmission** is a **solid choice for buyers who prioritize performance, luxury, and reliability over cutting-edge technology**. It offers a **balanced mix of power, comfort, and driving enjoyment**, making it ideal for **enthusiasts who appreciate BMW s driving dynamics** and are willing to **budget for maintenance**.

However, **potential buyers should be prepared for higher upkeep costs** and **common wear-and-tear issues** that come with aging luxury vehicles. If **proper maintenance is followed (oil changes, transmission fluid, cooling system checks)**, this BMW can be a **rewarding and enjoyable car** for **50,000 100,000 miles**.

For those who want **better fuel economy, modern tech, or lower long-term costs**, newer BMWs (e.g., **G30 4 Series, F40 M4, or even a well-maintained 2018 model**) may be worth considering. Alternatively, **used luxury alternatives (Audi A6, Mercedes E-Class, Lexus GS)** offer **similar prestige with slightly better reliability ratings**.

---

### **Recommendation**

You **prioritize driving dynamics and luxury** over the latest tech.

You **plan to maintain it properly** (regular oil changes, transmission fluid, cooling system checks).

You **find a well-documented example** with **service records** (especially for **water pump, struts, and transmission fluid**).

You **enjoy the N55 engine s sound and performance** and are okay with **higher maintenance costs**.

You **prefer a sedan (F10) or wagon (F32 Touring)** over a modern SUV or hatchback.

You **cannot afford BMW s maintenance costs** (expect **$1,000 $3,000/year** in upkeep).

You **need the latest infotainment features** (iDrive is outdated).

You **drive aggressively** (risk of **engine wear, suspension damage, or transmission stress**).

You **want better fuel economy** (consider a **turbocharged 4-cylinder or hybrid**).

You **find major red flags** (oil leaks, rough transmission, electrical issues).

This BMW is a **great mid-range luxury sedan/sport wagon** for the right buyer **someone who values performance, comfort, and is prepared for responsible ownership**. If you **inspect thoroughly, maintain religiously, and budget for repairs**, it can be a **fantastic daily driver or weekend car**. However, if **cost is a major concern or you want modern tech**, look elsewhere.

Details:

And cultural preferences income levels, family sizes, typical modes of transportation, etc. We subscribe to fitment software and include all relevant useful information in our listings whenever possible. On return this item. After items are removed and cleaned they inspected one final time before posting.

Emissions standards, side of road vehicles drive on, etc. Weather patterns cold vs. Initial testing consists of starting the vehicle, running code scans, road if safe to do so, and completing an extensive inspection checklist. Made for USA Vehicles: All vehicles and parts are manufactured to be sold the market.: Item has been fully inspected and tested found to be in good working order.

There may be normal signs of wear and tear present such as scratches, scuffs, dirt, etc. Left-Hand Drive Vehicles. The pictures are the ACTUAL PICTURES OF THE ITEM FOR SALE. SHIPPING DEALS: Review our shipping details before you purchase.

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specifications torquconv:

• for models: X1, Z4, F10, F30, F32
• for makes: Bmw
• for years: 2012-2018
• part type: Torque Transmission Converter
• donor year: 2013
• ipn: 407-999943
• miles: 53, 421
• tag: V51927

seller torquconv:

• city: Oroville, California
• # reviews: 29429
• rating: 99.9%

payments torquconv:

• credit card: Mastercard
• other
• wallet: Paypal

shipping torquconv:

• service: Standard
• cost: $0.00
• class: Standard
• type: Fixed
• transit: 3-6 Days

offer torquconv:

• availability: In Stock
• started: March 29, 2026
• options: Ship-to-home
• sold: 0
• quantity: 1

general torquconv:

• Car Truck Parts Accessories > Transmission Drivetrain > Torque Converters
• condition: Used

returns torquconv:

• paid by: Seller
• policy: Returns Accepted
• time: 60 Days

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