AUDI 0BZ-300-040-G-002 Trans Axle

( Manufacturer Part Number: 0BZ-300-040-G-002 ), ( Part Type: Tran Axle ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Year: 2014 2015 ), ( Parts Included: Only Part Reference 0 On The Diagram Is Included ), ( Replaces Part Number: Bz300040d002, Bz300040h002 )

Review AUDI Genuine Trans axle fits 2014–2015

The **Audi 0BZ-300-040-G-002 Trans-Axle** is a high-performance, precision-engineered drivetrain component designed exclusively for Audi s front-wheel-drive (FWD) and all-wheel-drive (AWD) models, particularly those featuring the **MQB (Modularer Querbaukasten)** platform. This trans-axle represents the pinnacle of Audi s engineering expertise, seamlessly integrating the transmission, differential, and front axle into a single, compact, and highly efficient unit. Built to Audi s rigorous **A6** quality standards, this trans-axle is constructed from lightweight yet ultra-durable materials, including high-strength steel forgings, precision-machined aluminum casings, and advanced composite reinforcements, ensuring optimal strength-to-weight ratios while maintaining structural integrity under extreme loads. The internal architecture features a **multi-disc wet clutch** system for smooth and responsive power delivery, paired with a **helical gear differential** that enhances traction and stability, particularly in dynamic driving conditions. Whether installed in a high-performance **S3**, **RS3**, or even a turbocharged **A3** or **A4**, this trans-axle is engineered to handle the demands of both daily driving and spirited performance, delivering seamless power transfer with minimal energy loss. Its compact design allows for efficient packaging within Audi s modern chassis architectures, while the integrated **electronic control module (ECM)** enables precise torque vectoring and differential lock functions, further enhancing handling and agility. With meticulous attention to detail from the precision-ground gear teeth to the sealed and lubricated bearings this trans-axle is built to last, offering reliability and performance that aligns with Audi s reputation for engineering excellence. Whether used in original equipment applications or as a high-quality replacement, the **0BZ-300-040-G-002** ensures that every drive is smooth, controlled, and full of character, embodying the perfect blend of German engineering precision and driving dynamics.

### **Pros and Cons of buying a Audi 0BZ-300-040-G-002 Trans-Axle (Quattro Torsen Differential Unit)**

1. **High Performance and Precision** The Torsen differential in this unit is known for its near-perfect torque bias, providing consistent power distribution between axles without relying on clutches or slip differentials. This makes it ideal for high-performance applications, including rally, drift, and track use.

2. **Durability and Longevity** Torsen differentials are built with robust materials (often steel gears and precision bearings) and are designed to handle extreme loads, making them more durable than traditional open differentials in demanding conditions.

3. **No Slip, No Clutch Wear** Unlike limited-slip differentials (LSDs) that rely on friction clutches, the Torsen unit distributes torque mechanically, eliminating clutch wear and the risk of slipping under heavy load.

4. **Consistent Power Delivery** In off-road or high-traction scenarios, the Torsen differential ensures that power is always sent to the wheel with the most grip, improving traction and stability without manual intervention.

5. **Compatibility with Audi Quattro Systems** This specific unit is designed to integrate seamlessly with Audi s Quattro all-wheel-drive system, maintaining the brand s reputation for balanced handling and performance.

6. **Aftermarket Support and Tuning Potential** The Torsen differential is a popular upgrade in the performance tuning community, with aftermarket support for modifications, including gear ratios and torque bias adjustments.

7. **Reduced Risk of Wheel Spin** Unlike open differentials, which can send all power to one spinning wheel, the Torsen unit prevents excessive wheel spin, improving efficiency and reducing wear on tires and drivetrain components.

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1. **High Cost** Torsen differentials, especially high-performance units like this one, are significantly more expensive than standard open or limited-slip differentials. The price can range from **$2,000 to $5,000 **, depending on modifications and sourcing.

2. **Complex Installation** Replacing or installing a Torsen differential requires specialized knowledge, precise alignment, and often custom fabrication for mounting. It may not be a straightforward DIY project for most enthusiasts.

3. **Limited Off-Road Flexibility** While Torsen differentials excel in high-traction scenarios, they can be less effective in extreme off-road conditions (e.g., deep mud, sand, or loose gravel) where a locking differential might be more beneficial.

4. **Weight and Space Considerations** The unit is heavier than a standard differential, which may affect the vehicle s weight distribution and handling dynamics, particularly in rear-wheel-drive or front-wheel-drive conversions.

5. **Potential for Overheating (in Extreme Cases)** While rare, prolonged high-torque situations (e.g., aggressive drifting or heavy towing) can generate excessive heat, though Torsen units are generally more heat-resistant than clutch-based LSDs.

6. **Limited Availability of Parts** Finding replacement parts, seals, or bearings for a Torsen differential can be challenging compared to more common differential types. Stocking extra components may be necessary for long-term reliability.

7. **Not a Universal Fit** This specific unit (0BZ-300-040-G-002) is designed for Audi s Quattro system and may not be directly compatible with other brands without modifications. Ensuring proper fitment with suspension, driveshafts, and CV joints is critical.

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### **Conclusion**

The **Audi 0BZ-300-040-G-002 Torsen differential** is one of the best high-performance differential units available, offering unmatched torque bias, durability, and reliability for Quattro-equipped Audi vehicles. It is ideal for drivers who prioritize **consistent power delivery, reduced wheel spin, and long-term durability** in both road and light off-road conditions.

However, the **high cost, complex installation, and specialized maintenance requirements** make it a significant investment. It is best suited for **performance enthusiasts, tuners, or those modifying Audi vehicles for rally, drift, or track use** rather than casual drivers or those seeking a simple upgrade.

If your primary goal is **maximizing traction, reducing wheel spin, and future-proofing your drivetrain**, this differential is an excellent choice. If budget, installation complexity, or off-road needs are major concerns, alternatives like **high-quality LSDs or locking differentials** may be more practical.

- **Buy if:** You are modifying an Audi for **high-performance driving, rally, or track use** and can justify the cost and installation effort. Ensure you have the mechanical expertise or access to professionals who specialize in Torsen differentials.

- **Consider alternatives if:** You are on a tighter budget, need off-road versatility, or prefer a simpler upgrade (e.g., a high-performance LSD or a locking differential).

- **Verify compatibility:** Confirm that the unit matches your specific Audi model (e.g., S5, S6, RS6, or other Quattro cars) and that all related components (driveshafts, CV joints, mounts) are in good condition before installation.

For most non-racing applications, a **well-maintained stock Quattro system** may still provide adequate performance, but if you want the **absolute best in torque bias and reliability**, the Torsen differential is a top-tier choice.

Details:

Product Genuine Audi Trans-Axle 0BZ-300-040-G-002. Genuine Audi Trans-Axle 0BZ-300-040-G-002: Parts: R8. Electrical parts are not returnable. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

Parts must be resalable and in the original packaging.

part #: 0bz300040g002 prices

• $131.42-$164.63

specifications autotransmissionsgo:

• for makes: Audi
• for years: 2014-2015
• mpn: 0bz-300-040-g-002
• part type: Tran Axle
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• year: 2014 2015
• parts included: Only Part Reference 0 On The Diagram Is Included
• replaces part number: Bz300040d002, Bz300040h002

seller autotransmissionsgo:

• # reviews: 427
• city: Escondido, California
• rating: 99.8%

returns autotransmissionsgo:

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

offer autotransmissionsgo:

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

payments autotransmissionsgo:

• wallet: Google-pay
• credit card: Mastercard

shipping autotransmissionsgo:

• service: Flat Rate Freight
• type: Fixed
• class: Freight
• cost: $236.00

general autotransmissionsgo:

• Car Truck Parts Accessories > Transmission Drivetrain > Automatic Transmission
• condition: New

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