1. Automatic Transmissions Products
  2. sku: 23154211251506762
  3. AUDI 0B6-300-036-CX-001

AUDI 0B6-300-036-CX-001 Trans Axle 4.2L

fits make: Audi.

0b6-300-036-cx-001 Audi Genuine Trans-axle 0b6300036cx001 Oem 4.2l

( Manufacturer Part Number: 0B6-300-036-CX-001 ), ( Part Type: Tran Axle ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Parts Included: Only Part Reference 0 On The Diagram Is Included ), ( Replaces Part Number: 0b6-300-035-n, 0b6-300-036-c, 0b6-300-036-c-001 )

Review AUDI Genuine Trans axle 0b6300036cx001 Oem 4.2l

The **Audi 0B6-300-036-CX-001 (0B6300036CX001) Trans-Axle** is a high-performance, precision-engineered drivetrain component designed exclusively for Audi s 4.2-liter V8 models, including the iconic **Audi S6 (C5), S8 (C5), and RS6 (C5)**, as well as select **Audi A6 (C5) and A8 (D2)** variants equipped with the **3.7L or 4.2L V8 engines**. This trans-axle is a critical hybrid drivetrain assembly that seamlessly integrates the **transmission, differential, and rear axle** into a single, compact unit, optimizing space efficiency and performance in Audi s front-engine, rear-wheel-drive (FWR) architectures. Built to Audi s rigorous **Q2 quality standards**, this component is manufactured using **high-strength steel, precision-machined gears, and advanced bearing systems** to ensure durability, smooth operation, and exceptional load-bearing capacity under extreme driving conditions.

The **0B6-300-036-CX-001** is part of Audi s **0B6 series**, which includes variants of the **5-speed Tiptronic (0B6-300-036)** and **6-speed Tiptronic (0B6-300-036-CX)** transmissions, making it compatible with both manual and automatic transmission setups. The trans-axle features a **spiral-bevel hypoid differential** with a **limited-slip differential (LSD) option** in certain models, enhancing traction and cornering stability while delivering precise power delivery to the rear wheels. The **rear axle housing** is designed with **integrated oil seals, a robust driveshaft flange, and a reinforced differential carrier** to withstand the high torque outputs of the **4.2L 3.7L V8 engines**, which produce between **280 400 horsepower** depending on the model and tuning. This trans-axle is also engineered to accommodate Audi s **Quattro all-wheel-drive system** in models where the front differential is separately mounted, ensuring seamless power distribution when engaged.

For restoration, performance tuning, or replacement purposes, this trans-axle is a **direct-fit, OEM-level component**, ensuring compatibility with the original mounting points, fluid specifications, and electrical connections. The **0B6-300-036-CX-001** is particularly sought after by enthusiasts and professional mechanics due to its **superior build quality, longevity, and performance characteristics**, making it an essential upgrade for those seeking to restore or enhance the driving dynamics of their Audi V8 models. Whether used in a **stock restoration, high-performance build, or classic car preservation project**, this trans-axle delivers the **reliability, precision, and power handling** expected from Audi s high-end engineering. Proper installation requires **specialized tools, torque specifications, and adherence to Audi s service manual procedures** to ensure optimal performance and longevity.

### **Pros and Cons of buying a Audi 0B6-300-036-CX-001 Transaxle (4.2L V8 Engine)**

#### **Pros**

1. **Proven Reliability (When Maintained Properly)**

- The **0B6** transaxle (used in Audi 200/90, VW Passat, and other models) is a well-known and robust unit when kept in good condition. Many drivers report smooth operation if it has been regularly serviced.

- The **4.2L V8 engine** (used in Audi 90/200, VW Passat, and some Porsche 944s) is known for durability, especially in its **ABS/non-ABS** versions. With proper maintenance, it can easily exceed **200,000 miles**.

2. **Strong Performance (For Its Era)**

- The **4.2L V8** produces **around 174 190 HP** (depending on model year and tuning), which was solid for its time (mid-1980s to early 1990s).

- The **transaxle (0B6)** is a **front-wheel-drive automatic**, which means it combines the transmission and differential in one unit, reducing drivetrain complexity compared to traditional rear-wheel-drive setups.

3. **Availability of Parts & Aftermarket Support**

- Being an older but common unit, **parts are widely available**, including rebuild kits, seals, and clutches.

- Many **aftermarket tuners** (such as **AEM, Haltech, or standalone ECU flashers**) can improve performance and reliability.

- **Remanufactured transaxles** are also available, which can be a cost-effective alternative to buying used.

4. **Modding Potential**

- The **4.2L V8** is a **popular project engine** due to its simplicity and strength. Common mods include:

- **Forced induction (turbo/supercharger)** Many builders have successfully added turbocharging, though head gasket and oil control issues can arise if not managed properly.

- **High-flow exhaust & intake** Improves airflow and can boost power.

- **Upgraded suspension & brakes** Enhances handling and stopping power.

- The **transaxle can be upgraded** with a **heavy-duty torque converter** or **performance clutch** for better shift feel.

5. **Lower Cost of Ownership (Compared to Modern Cars)**

- **Fuel efficiency** is decent for a V8 ( 12 15 MPG in a Passat, 10 13 MPG in an Audi 200).

- **Insurance and registration costs** are often lower than modern high-performance cars.

- **Basic maintenance (oil changes, spark plugs, timing belt)** is relatively inexpensive.

6. **Classic & Niche Appeal**

- If you enjoy **retro European driving**, the **Audi 200/90 or Passat** has a **distinctive look and feel** that many enthusiasts appreciate.

- **Restomod projects** (modernizing an old car with contemporary tech) are popular, making this a fun build platform.

---

#### **Cons**

1. **Potential Reliability Issues (If Neglected)**

- **Transaxle (0B6) Problems:**

- **Slipping or rough shifting** Often caused by **worn clutches, low fluid, or a failing torque converter**.

- **Leaking seals** The **input/output shafts and planetary carrier seals** are common failure points.

- **Bearing wear** If the transaxle hasn t been rebuilt, **grinding noises** may indicate failing bearings.

- **4.2L V8 Common Issues:**

- **Head gasket failures** A major concern, especially if the engine was **overheated or modified aggressively**. Symptoms include **white smoke, coolant in oil, or compression loss**.

- **Oil control rings** The **4.2L is prone to oil consumption**, leading to **blue smoke and low oil levels**.

- **Distributor & ignition issues** Older models may need **distributor cap, rotor, and coil replacements**.

- **Water pump & thermostat failures** The **cooling system can fail**, leading to **overheating and head gasket damage**.

2. **High Maintenance Requirements**

- **Regular fluid changes** (transaxle fluid every **30K 50K miles**, differential fluid if applicable).

- **Timing belt replacement** (critical on this engine **must be done on schedule**, usually every **60K 100K miles**).

- **Spark plugs & ignition system checks** (carbon buildup can be an issue).

- **Coolant system flushes** (to prevent corrosion and scaling).

3. **Modding Risks (If Not Done Correctly)**

- **Turbocharging the 4.2L** can be **rewarding but risky** if not properly supported. Common issues include:

- **Head gasket blowouts** under boost.

- **Oil control ring failures** leading to **catastrophic engine damage**.

- **Transaxle overheating** if the **cooling system isn t upgraded**.

- **Forced induction requires:**

- **Upgraded fuel system** (pump, injectors, fuel rail).

- **Stronger internals** (pistons, rods, crankshaft).

- **Better cooling** (intercooler, radiator, oil cooler).

4. **Driving Experience Limitations**

- **Front-wheel drive** means **less engaging rear-wheel-drive feel** compared to modern RWD cars.

- **Automatic transmission** can feel **less responsive** than a manual, though some aftermarket conversions exist.

- **Ride quality** can be **softer than modern cars**, which may not appeal to those seeking sportiness.

5. **Environmental & Modern Compliance Issues**

- **Emissions regulations** may require **modifications** (catalytic converters, OBD-II compliance) if driving in strict areas.

- **Modern fuel standards** (higher ethanol content) can **corrode older fuel systems** if not properly maintained.

- **Electric & hybrid alternatives** are now more efficient and environmentally friendly.

6. **Resale Value & Market Demand**

- **Classic Audi/Passat 4.2L cars** have a **niche market**, but **resale value is not strong** compared to modern or highly sought-after classics.

- **Project cars** (those needing work) **depreciate faster** than fully restored or stock examples.

---

### **Conclusion & Recommendation**

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

**Buy if you:**

- Are looking for a **fun, modifiable project car** with **strong V8 power**.

- Enjoy **retro European driving** and don t mind **higher maintenance**.

- Plan to **invest time and money into rebuilding or upgrading** the transaxle and engine.

- Want a **lower-cost alternative** to modern high-performance cars.

- Are prepared for **potential reliability issues** but have the skills (or budget) to fix them.

#### **Who Should Avoid This?**

**Avoid if you:**

- Want a **low-maintenance, plug-and-play** vehicle.

- Don t have **mechanical experience** or access to a **good mechanic**.

- Are **not willing to spend $2K $5K ** on **transaxle rebuilds, engine work, or mods**.

- Prefer **modern safety and reliability** (airbags, modern electronics, crash structures).

- Don t enjoy **older, less refined driving dynamics**.

#### **Final Recommendation**

If you **buy this transaxle and engine**, **prioritize these steps to maximize reliability:**

1. **Rebuild or replace the transaxle** if it s worn (expect **$1,500 $3,000** for a rebuild).

2. **Check for head gasket leaks** (compression test, coolant/oil inspection).

3. **Upgrade the cooling system** (radiator, water pump, thermostat).

4. **Consider a remanufactured transaxle** if the current one is unreliable.

5. **If modifying for power**, **support the engine properly** (fuel, cooling, internals).

6. **Budget for regular maintenance** (fluid changes, timing belt, ignition system).

**Best Use Cases:**

- **Project car** for a **fun, high-revving V8 experience**.

- **Restomod** (modernizing suspension, interior, electronics).

- **Track day or autocross** (with proper upgrades).

- **Niche collector s item** (if you love the era).

**Worst Use Cases:**

- **Daily driver without mechanical knowledge**.

- **Budget-conscious buyer expecting low costs**.

- **Someone who wants modern reliability and safety**.

**Verdict:**

This **0B6 transaxle and 4.2L V8** can be a **great project** if you re **prepared for work and willing to invest**. However, it s **not a "set-and-forget"** purchase. If you re **serious about building or restoring**, it s a **fantastic choice**. If you want **ease and reliability**, look elsewhere

Details:

Genuine Audi Trans-axle 0B6300036CX001 OEM 4.2L 0B6-300-036-CX-001: Parts: S5. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Losses or damages that occur after final delivery confirmation are not covered. Special Order Items are not returnable under any circumstance.

Parts must be resalable and in the original packaging. Electrical parts are not returnable.

part #: 0b6300036cx001 price

  • $11341.41

specifications autotransmissionsgo:

  • for makes: Audi
  • mpn: 0b6-300-036-cx-001
  • part type: Tran Axle
  • genuine oem: Yes
  • manufacturer warranty: 1 Year
  • fitment type: Direct Replacement
  • parts included: Only Part Reference 0 On The Diagram Is Included
  • replaces part number: 0b6-300-035-n, 0b6-300-036-c, 0b6-300-036-c-001

general autotransmissionsgo:

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

offer autotransmissionsgo:

  • options: Ship-to-home
  • started: March 13, 2026
  • sold: 0
  • availability: In Stock
  • quantity: 1

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  • paid by: Seller
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  • policy: Returns Accepted

shipping autotransmissionsgo:

  • class: Freight
  • service: Flat Rate Freight
  • cost: $232.00
  • type: Fixed

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for makes: audi, part type: tran axle, genuine oem: yes, manufacturer warranty: 1 year, fitment type: direct replacement, parts included: only part reference 0 on the diagram is included, replaces part number: 0b6-300-035-n, 0b6-300-036-c, 0b6-300-036-c-001,
category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23154211251506762,
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