1. Automatic Transmissions Products
  2. sku: 23985640203583891
  3. AUDI 09L-300-037-KX

AUDI 09L-300-037-KX Trans Axle

fits make: Audi. year: 2005–2007.

09l-300-037-kx Audi Genuine Trans-axle

( Manufacturer Part Number: 09L-300-037-KX ), ( Part Type: Tran Axle ), ( Year: 2005 2006 2007 ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Genuine Oem: Yes )

Review AUDI Genuine Trans axle fits 2005–2007

The **Audi 09L-300-037-KX Trans-Axle** is a high-performance, precision-engineered drivetrain component designed exclusively for Audi s front-wheel-drive (FWD) and all-wheel-drive (AWD) platforms, particularly those equipped with the 1.8T, 2.0T, and 2.8T engines spanning generations from the late 1990s through the early 2010s. This trans-axle serves as a critical link between the engine s power output and the front wheels, integrating the transmission and differential into a single, compact, and robust unit to optimize space efficiency and handling dynamics. Crafted from high-strength steel and reinforced alloys, the 09L-300-037-KX is built to withstand the demands of both daily driving and spirited performance, featuring a multi-plate wet clutch system for seamless gear engagement and a helical-bevel differential that ensures smooth power delivery while minimizing torque steer. The design incorporates Audi s signature **Quattro** all-wheel-drive capability in compatible models, allowing for dynamic torque distribution between the front and rear axles via a center differential, enhancing traction and stability across a variety of road conditions. This trans-axle is particularly notable for its integration with the **09L** transmission family, which includes variants like the 09L-300 (6-speed manual) and 09L-301 (6-speed automatic), ensuring compatibility with Audi s iconic models such as the A4, A6, TT, and S4, among others. Whether restored for a classic enthusiast or rebuilt for a high-mileage daily driver, the 09L-300-037-KX exemplifies Audi s commitment to blending German engineering precision with practical, performance-oriented drivetrain solutions. Its modular construction allows for straightforward maintenance, with accessible components like the oil pump, torque converter (in automatic variants), and differential gears, making it a favored choice for both professional mechanics and DIY automotive enthusiasts seeking reliability and longevity.

### **Pros and Cons of buying a Audi 09L-300-037-KX Trans-Axle**

The **Audi 09L-300-037-KX** is a trans-axle (transmission and axle combined) used in certain Audi models, particularly the **A4 B8 (2015 2023)** and **A5/C5 (2016 2023)** with the **09L 7-speed S tronic** transmission. Below is a detailed breakdown of its advantages and disadvantages.

---

### **Pros**

1. **OEM Quality and Reliability**

- This is an **original Audi part**, meaning it meets the manufacturer s exact specifications for fit, function, and durability. Unlike aftermarket alternatives, it is designed to integrate seamlessly with the vehicle s drivetrain.

- Audi s engineering ensures proper synchronization with the **7-speed S tronic** transmission, reducing the risk of premature wear or compatibility issues.

2. **Long-Term Durability**

- Audi trans-axles are built to last **150,000 250,000 miles** under normal conditions, especially if the vehicle is maintained properly. The **09L-300-037-KX** is no exception, provided it is not subjected to severe abuse (e.g., aggressive driving, lack of fluid changes, or modifications).

- The **7-speed S tronic** is known for its robustness in Audi models, particularly when paired with the correct trans-axle.

3. **Warranty Coverage**

- If purchased **new from Audi or an authorized dealer**, this part may come with a **factory warranty** (typically 12 24 months or 12,000 24,000 miles, depending on the dealer).

- Some extended warranties or service plans may also cover it, adding peace of mind.

4. **Performance and Smooth Operation**

- The **09L trans-axle** is optimized for Audi s **TFSI (Turbo Fuel Stratified Injection) engines**, particularly the **2.0T and 2.9T** variants in the A4/A5. It provides **precise gear shifts** and **efficient power delivery**, which is crucial for handling and acceleration.

- The **integrated differential** ensures balanced power distribution, improving traction and drivability.

5. **Easier Maintenance (Compared to Separate Transmission Axle)**

- Since the trans-axle combines the transmission and axle into one unit, **fluid changes and inspections** can be done more efficiently than in a split system. This reduces labor time and potential for leaks or misalignment.

- Fewer moving parts in the drivetrain mean **less wear and tear** over time.

6. **Resale Value and Compatibility**

- Audi trans-axles remain in demand due to their **reliability and performance**, making them easier to sell or trade in if needed.

- The **09L-300-037-KX** is **directly compatible** with the following models:

- **Audi A4 B8 (2015 2023)** with 2.0T or 2.9T engines

- **Audi A5/C5 (2016 2023)** with the same engine configurations

- It is also **interchangeable with some S5 and S6 models** (depending on the year and trim), expanding its usability.

7. **Superior to Aftermarket Alternatives**

- While aftermarket trans-axles (e.g., from **Megatech, ACDelco, or local shops**) may be cheaper, they often lack the **precision engineering, warranty support, and long-term reliability** of an OEM part.

- Cheap alternatives may also **void warranty coverage** on the transmission or drivetrain.

---

### **Cons**

1. **High Upfront Cost**

- The **09L-300-037-KX trans-axle is expensive**, typically ranging from **$2,500 to $4,500 ** depending on the source (new vs. used, dealer vs. auction).

- This makes it a **significant investment**, especially if the vehicle already has transmission issues.

- **Labor costs** for installation (if not DIY) can add **$500 $1,500**, depending on the shop.

2. **Limited Availability and Lead Times**

- OEM parts, especially for **discontinued models**, can be **hard to find quickly**. Dealers may have long wait times (weeks to months) for stock.

- Purchasing from **third-party suppliers (e.g., RockAuto, eBay, or salvage yards)** may require verification of authenticity to avoid counterfeit parts.

3. **Potential for Hidden Issues in Used Units**

- If buying a **used/refurbished trans-axle**, there is a risk of **pre-existing damage** (e.g., worn synchronizers, leaking seals, or internal wear).

- Without a **full inspection or warranty**, you may end up paying for repairs shortly after installation.

- **Audi s warranty does not typically cover used parts**, so you are responsible for any failures.

4. **Complex Installation**

- Replacing a trans-axle is a **labor-intensive job** that requires:

- Removing the engine/transmission assembly (in some cases, lifting the vehicle).

- Proper alignment of the **input/output shafts**.

- Torque specifications must be followed precisely to avoid damage.

- **DIY installation is difficult** for most owners due to the **specialized tools and expertise** required. Most will need a **mechanic with Audi experience**.

5. **Potential for Fluid Contamination**

- If the **old trans-axle was leaking or had degraded fluid**, residue can contaminate the **new unit**, leading to **premature wear**.

- A **full flush and filter replacement** is recommended before installation to prevent this.

6. **Weight and Space Constraints**

- The **09L trans-axle is heavy** (around **100 120 lbs**), which can make handling and installation more difficult.

- In some **tight engine bays (e.g., A5 Cabriolet)**, clearance may be an issue, requiring **modifications or careful removal of surrounding components**.

7. **Risk of Overuse or Misuse**

- If the vehicle has a history of **aggressive driving, towing, or lack of maintenance**, the trans-axle may not last as long as expected.

- **Ignoring transmission fluid changes** (every **60,000 100,000 miles**) can lead to **premature failure**, negating the benefits of a new unit.

---

### **Conclusion**

The **Audi 09L-300-037-KX trans-axle** is a **high-quality, reliable component** that offers **superior performance, longevity, and compatibility** with Audi s **7-speed S tronic** systems. It is the **best choice for owners** who want **OEM reliability, warranty coverage, and long-term durability**, especially in **A4 B8 and A5/C5 models**.

However, the **high cost, installation complexity, and potential for hidden issues in used units** make it a **significant financial and logistical commitment**. It is **not the best option** for those on a tight budget or those who cannot afford professional installation.

---

### **Recommendation**

#### **Buy the 09L-300-037-KX If:**

You **own an A4 B8 or A5/C5 (2015 2023) with transmission issues** and want a **long-term, reliable fix**.

You **have the budget** ($3,000 $5,000 ) and can afford **professional installation** ( $1,000 $1,500).

You **prioritize OEM quality** over cost savings and want **warranty coverage**.

You **plan to keep the vehicle long-term** (100,000 miles) and maintain it properly (fluid changes, inspections).

You **cannot find a suitable aftermarket alternative** with equivalent reliability.

#### **Consider Alternatives If:**

You are **on a tight budget** explore **aftermarket trans-axles** (e.g., **Megatech, ACDelco**) or **used OEM units** (with inspection).

You **lack the skills or tools** for DIY installation ensure you have a **trusted Audi specialist** for labor.

The vehicle has **other major issues** (e.g., engine problems, frame damage) a trans-axle replacement alone may not be enough.

You **cannot verify the part s authenticity** purchase from **authorized Audi dealers or reputable suppliers** (e.g., **RockAuto, eBay verified sellers**).

You **do not plan to keep the car long-term** a trans-axle is a **big investment** that may not be justified for short-term ownership.

#### **Best Approach:**

1. **Get a professional diagnosis** confirm

Details:

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. Genuine Audi Trans-Axle 09L-300-037-KX: Parts: A4, S4. Product Genuine Audi Trans-Axle 09L-300-037-KX.

Without Quarto. Electrical parts are not returnable.

part #: 09l300037 price

  • $1659.66

specifications autotransmissionsgo:

  • for makes: Audi
  • for years: 2005-2007
  • mpn: 09l-300-037-kx
  • part type: Tran Axle
  • year: 2005 2006 2007
  • manufacturer warranty: 1 Year
  • fitment type: Direct Replacement
  • genuine oem: Yes

returns autotransmissionsgo:

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

payments autotransmissionsgo:

  • wallet: Apple-pay
  • credit card: Mastercard
  • other

general autotransmissionsgo:

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

shipping autotransmissionsgo:

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

seller autotransmissionsgo:

  • # reviews: 468
  • rating: 99.8%
  • city: Escondido, California

offer autotransmissionsgo:

  • availability: In Stock
  • quantity: 1
  • options: Ship-to-home
  • started: May 28, 2026
  • sold: 0
for makes: audi, for years: 2005-2007, part type: tran axle, year: 2005 2006 2007, manufacturer warranty: 1 year, fitment type: direct replacement, genuine oem: yes,
manufacturer: audi, category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23985640203583891,
Audi 09L-300-037 Is Similar To:
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1 offer $1659.66 USD
  • Usato. Offer #1 priced at $1659.66 + $420.62 shipping estimate = $2080.28* total. HKG 09L 300 037 CX Cambio per AUDI A6 AVANT 3.0 TDI QUATTRO BMK 2005.+$420.62 shipping

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