BMW 24405A13209 Automatic Transmission Torque Converter 4.4 74K

( Manufacturer Part Number: 24405A13209 ), ( Part Type: Torque Transmission Converter ), ( Manufacturer Warranty: 1 Month ), ( Oe/oem Part Number: 5a13209 / 5 A13 209 / 5-a13-209, 8672588 / 8 672 588 / 8-672-588 )

Review BMW 4.4 Automatic Transmission Torque Converter 74k fits M550 X5 X7 750 2019–2020

The **BMW 24405A13209 (2016 2019 750i M550i, 2019 2020 X5 x7)** is a premium, high-performance torque converter designed for BMW s sophisticated **N63TU twin-turbocharged V8 engine**, delivering an uncompromising blend of power, refinement, and durability. Engineered to complement the **4.4-liter inline-eight** which produces a staggering **400 500 horsepower** (depending on the model) and **479 lb-ft of torque** this torque converter is a critical component in the **8-speed ZF 8HP automatic transmission**, ensuring seamless power delivery while maintaining the signature BMW driving dynamics. Crafted from high-grade materials, including **stamped steel and reinforced aluminum components**, it is built to withstand the intense torque demands of the M550i s aggressive performance tuning, whether navigating the twisty roads of a European rally or cruising effortlessly on the highway.

What sets this torque converter apart is its **advanced hydrodynamic design**, featuring a **multi-stage turbine and stator assembly** optimized for both **low-end torque response** and **high-revving efficiency**. The **torque converter clutch (TCC)** engages smoothly at higher RPMs, reducing slip and improving fuel economy without sacrificing the exhilarating acceleration that BMW enthusiasts expect. The **impeller and turbine blades** are precision-machined to minimize turbulence, ensuring a **quiet, vibration-free operation** even under full throttle, a hallmark of BMW s commitment to luxury and precision engineering. Additionally, the **sealed internal components** are engineered to resist wear from the aggressive nature of the V8 s forced induction, extending the lifespan of the transmission and preventing costly failures.

For the **2019 2020 X5 x7 models**, this torque converter is particularly noteworthy due to its integration with BMW s **iDrive-infotainment system and adaptive suspension**, allowing for a **dynamic yet comfortable ride** that transitions effortlessly between sporty handling and refined cruising. Whether paired with the **M550i s 8-speed automatic** or the **xDrive all-wheel-drive system**, this component ensures that every shift from launch to highway cruising is executed with **military-grade precision**. The **robust housing and reinforced shaft** are designed to handle the **high-torque demands** of the V8 while maintaining structural integrity, making it an ideal upgrade for owners seeking to enhance reliability and performance.

Beyond its technical prowess, this torque converter embodies BMW s **attention to detail**, from the **smooth engagement of the lockup clutch** to the **reduced transmission lag** that keeps the driving experience engaging yet refined. Whether in a **750i sedan, X5 SUV, or x7 executive wagon**, it serves as the unsung hero behind the **instantaneous power delivery** that defines the M550i s character. For those who demand **both luxury and performance**, this torque converter is a **must-have upgrade**, ensuring that every shift is as seamless as the rest of the BMW driving experience where engineering meets artistry.

### **Pros and Cons of Buying a 2016 2019 BMW X5/X7 (F15/F16) with the 4.4L TwinPower Turbo V8 (N63B44) and 8AT Transmission**

#### **Overview**

The **2016 2019 BMW X5 (F15) and X7 (F16) with the 4.4L V8 (M550i/M550d)** are premium luxury SUVs known for their performance, comfort, and BMW s signature driving dynamics. The **N63B44 engine** (gas) and **N57D30 (diesel)** are robust powerplants, but they come with trade-offs. Below is a detailed breakdown of their strengths and weaknesses.

---

### **Pros**

#### **1. Performance & Power**

- The **M550i (gas)** produces **400 445 hp (depending on year)** and **429 lb-ft of torque**, delivering strong acceleration and a thrilling driving experience.

- The **M550d (diesel)** offers **381 414 hp and 680 750 lb-ft of torque**, providing exceptional towing capacity and fuel efficiency in highway driving.

- Smooth shifts, quick gear changes, and a **torque converter** (not a dual-clutch) ensure reliable performance without manual intervention.

- The transmission is well-suited for the V8 s torque, though it may feel slightly sluggish in low-speed maneuvers compared to a manual.

- Standard on most models, improving traction in wet or snowy conditions.

#### **2. Luxury & Comfort**

- High-quality materials (leather, aluminum trim, wood accents), spacious seating, and advanced infotainment (iDrive 7 or 8, depending on model year).

- **Heated/ventilated seats, massagers, and panoramic sunroofs** enhance comfort.

- Effective sound insulation reduces road and engine noise, making long drives pleasant.

- **X5:** Up to **18.5 cu. ft. of cargo space** (with seats folded) and **5,500 lbs towing capacity (M550d).**

- **X7:** Larger cabin with **22.5 cu. ft. of cargo space** and similar towing potential.

#### **3. Reliability & Durability (Compared to Competitors)**

- The **N63B44 (gas) and N57D30 (diesel)** are BMW s most refined V8s of their era, with **direct injection, turbocharging, and high compression ratios** for efficiency and power.

- **Less prone to catastrophic failure** than earlier BMW V8s (e.g., N54), though **carbon buildup on intake valves** (a known issue) may require maintenance.

- BMW s luxury status keeps these models holding value better than many competitors.

- The **8AT is robust** but may require **fluid changes** every **60,000 80,000 miles** to prevent wear.

#### **4. Driving Dynamics & Handling**

- **Adaptive damping (optional)** improves comfort and sportiness.

- **Rear-wheel steering (optional)** enhances maneuverability at low speeds.

- The V8 s **throttle response and exhaust note** make it enjoyable for enthusiasts.

- **Available M Performance Package** (stiffer suspension, sport pedals, 20" wheels) for a more track-like feel.

#### **5. Safety & Technology**

- Standard **BMW Safety Personal (BSP)** includes **adaptive cruise control, lane-keeping assist, blind-spot monitoring, and automatic emergency braking.**

- **Top Safety Pick (IIHS)** ratings for 2016 2019 models.

- **iDrive 7/8 with touchscreen, Apple CarPlay, Android Auto, and wireless charging.**

- **Head-up display (optional)** projects key driving info onto the windshield.

---

### **Cons**

#### **1. High Maintenance Costs**

- BMWs are **notoriously costly to maintain**, especially for **engine tuning, suspension, and electrical systems.**

- **Carbon buildup on intake valves** (common in direct-injection engines) may require **valve cleaning every 60,000 100,000 miles** ($1,000 $1,500).

- **Transmission fluid changes** should be done **every 60,000 miles** to prevent slippage.

- Many repairs require **authorized BMW dealers**, increasing costs.

#### **2. Fuel Efficiency (Gas Model)**

- **MPG is poor** ( 16 18 city, 22 24 highway), making it **less economical** than diesel or hybrid alternatives.

- **High fuel consumption** adds to long-term ownership costs.

#### **3. Diesel-Specific Concerns (M550d)**

- **Diesel Particulate Filters (DPF) and Exhaust Gas Recirculation (EGR) systems** can clog, requiring **expensive cleanings or replacements** ($1,500 $3,000).

- **Cold-weather issues** (DPF regeneration problems) may arise if the vehicle isn t driven frequently.

- The **M550d (381 414 hp)** is **less powerful than the M550i (400 445 hp)**, though it compensates with **exceptional torque.**

#### **4. Transmission Quirks**

- Some owners report **delayed shifts in stop-and-go traffic** due to the torque converter.

- **Fluid degradation** over time can lead to **rough shifts or slippage** if not maintained.

- The **automatic-only transmission** may disappoint enthusiasts who prefer manual control.

#### **5. Weight & Fuel Economy Trade-Off**

- The **X5/X7 are large and heavy**, which **reduces fuel efficiency** and **makes handling slightly less nimble** than smaller luxury cars.

- The **M550d is more fuel-efficient ( 25 30 MPG highway)** than the gas version but still **not as efficient as hybrids or turbocharged 4-cylinders.**

#### **6. Depreciation & Long-Term Costs**

- BMWs lose **value quickly**, especially compared to **Toyota Land Cruiser, Mercedes GLE, or Audi Q7.**

- **Electric and hybrid SUVs** (e.g., Tesla Model X, Audi e-tron) are now **cheaper to own long-term** due to lower fuel and maintenance costs.

- **High insurance premiums** due to **repair costs and theft risk** (BMWs are often targeted).

#### **7. Noise & Vibration Issues**

- While the cabin is **quiet at highway speeds**, **lower trims may have more road noise** than higher-end models.

- Some owners report **excessive vibrations at certain RPMs**, though this is **not universal.**

---

### **Ending Conclusion & Recommendation**

#### **Who Should Buy This Vehicle?**

- **Enthusiasts who prioritize driving dynamics and V8 power** over fuel efficiency.

- **Those who need a **luxury SUV with strong towing capacity (especially the M550d).**

- **Buyers who can afford **high maintenance costs** and prefer **BMW s premium brand.**

- **People who want a **spacious, comfortable, and safe** vehicle for **family or long trips.**

- **Owners who **drive frequently enough** to justify the **diesel s efficiency benefits (M550d).**

#### **Who Should Avoid It?**

- **Budget-conscious buyers** (high purchase price maintenance costs).

- **Those prioritizing **fuel efficiency** (consider a **hybrid, diesel 4-cylinder, or electric SUV** instead).

- **People who dislike **BMW s aggressive driving feel** (heavy steering, firm suspension).

- **Those who **rarely drive long distances** (diesel DPF issues, gas model s poor MPG).

- **Buyers who want **lower long-term costs** (electric/hybrid SUVs are now more economical).

####

Details:

X5 X7 50i ONLY. So, if you just plug an item in, in most cases it will not work or correctly. Mileage 74 Miles. Please see the list of compatible model's and part numbers.

30-day warranty, excluding items for parts or not working. FREE RETURN SHIPPING for any reason. Fits for 4.4L ONLY. Good condition, please see the pictures.

Tested, working well.

part #: 24405a13209 prices

• $222.23-$238.88

specifications torquconv:

• for models: M550, X5, X7, 750
• for makes: Bmw
• for years: 2019-2020
• mpn: 24405a13209
• part type: Torque Transmission Converter
• manufacturer warranty: 1 Month
• oe/oem part number: 5a13209 / 5 A13 209 / 5-a13-209, 8672588 / 8 672 588 / 8-672-588

returns torquconv:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer torquconv:

• sold: 0
• options: Ship-to-home
• started: March 19, 2026
• best offers: True
• quantity: 1
• availability: In Stock

payments torquconv:

• wallet: Google-pay
• credit card: Discover
• other

shipping torquconv:

• service: UPS Ground Saver
• class: Economy
• type: Fixed
• carrier: UPS
• transit: 4-7 Days
• cost: $39.00

seller torquconv:

• city: Hollywood, Florida
• rating: 100.0%
• # reviews: 1982 7

general torquconv:

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

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