MERCEDES Transmission Planetary Gear Benz 722.313

( Manufacturer Part Number: R1262721108 ), ( Type: Automatic Transmission ), ( Oe/oem Part Number: Center Shaft ), ( Universal Fitment: No ), ( Country Of Origin: Germany )

Review MERCEDES benz Transmission Planetary Gear 1262721108 fits 560SL 1986–1991

The **Mercedes-Benz R126 722.313 Transmission Planetary Gear (Part Number: 1262721108)** is a critical and highly specialized component integral to the smooth operation of the iconic **560SL (R126) model** produced between **1986 and 1991**. This gear belongs to the **722.313 automatic transmission**, a sophisticated four-speed unit designed to deliver the refined performance and luxurious driving experience synonymous with Mercedes-Benz s high-performance roadsters. Crafted with precision engineering, this planetary gear plays a pivotal role in the transmission s ability to efficiently transfer power from the engine to the wheels while maintaining seamless shifts and optimal torque distribution. The **R126 560SL** was renowned for its combination of raw power, aerodynamic elegance, and cutting-edge technology, and the **722.313 transmission** was a cornerstone of its reliability and performance. This particular gear is part of the transmission s planetary cluster, responsible for the intricate meshing of planetary pinions, sun gears, and carrier assemblies that enable the transmission to achieve its signature smooth yet sporty shift characteristics. Over time, wear and tear particularly in high-mileage or performance-driven examples can compromise the integrity of these gears, leading to symptoms such as delayed shifts, grinding noises, or even complete transmission failure. Replacing this component with an **OEM-quality or high-replica aftermarket gear** ensures that the transmission operates at peak efficiency, restoring the **560SL s** legendary driving dynamics. Whether restoring a classic to its original glory or upgrading an existing transmission, this gear is an essential part of preserving the **R126 s** legendary status as one of Mercedes-Benz s most coveted and mechanically sophisticated models. Its compatibility with the **560SL s** **3.8L V8 engine** and **722.313 transmission** makes it a must-have for enthusiasts seeking to maintain or enhance the performance of this legendary roadster.

### **Pros and Cons of Buying a Mercedes-Benz 560SL (R126) with a 722.313 Transmission (1986 1991)**

#### **Pros**

1. **Classic Design and Prestige**

- The 560SL is one of the most iconic Mercedes-Benz roadsters, known for its timeless coupe and convertible styling. Owning one carries significant prestige and appeal among classic car enthusiasts.

2. **Strong Engine Performance**

- The 5.6L V8 (M117) produces **286 306 hp** (depending on model year) and **369 lb-ft of torque**, delivering smooth, luxurious power. The engine is robust and capable of handling high speeds with ease.

3. **Automatic Transmission (722.313) Reliability**

- The **722.313** is a well-regarded automatic transmission for its era, known for smooth shifting and durability when properly maintained. It is less prone to catastrophic failure compared to some other Mercedes transmissions of the time.

4. **Luxury and Comfort**

- The interior is spacious, well-appointed, and designed for comfort, with high-quality materials (leather, wood trim, power seats, and climate control). The ride is plush, making it ideal for long drives.

5. **Convertible Top (If Applicable)**

- The convertible version offers an open-air driving experience, which is highly desirable for enthusiasts who enjoy the freedom of a roadster.

6. **Strong Resale Value for Classics**

- As a well-preserved example of a rare and desirable Mercedes-Benz model, a properly maintained 560SL retains good value in the classic car market.

7. **Modification Potential**

- The V8 can be tuned for increased performance (e.g., upgraded intake/exhaust, ECU remapping), and the chassis can be restored or modified for better handling.

8. **Historical Significance**

- The R126 560SL was produced during a transitional period for Mercedes-Benz, blending classic elegance with modern engineering. Owning one allows you to experience a piece of automotive history.

---

#### **Cons**

1. **High Maintenance Costs**

- Classic Mercedes-Benz vehicles, especially luxury models like the 560SL, require **specialized knowledge and high-quality parts**. Maintenance (e.g., suspension, electrical, engine) can be expensive, and labor costs are often prohibitive unless done by a skilled mechanic.

2. **Transmission (722.313) Potential Issues**

- **Slipping or rough shifting** (especially in hot conditions).

- **Torque converter failure** (common in high-mileage examples).

- **Fluid leaks** (seals, gaskets, and the torque converter housing can wear out).

- Rebuilding or replacing the transmission can cost **$3,000 $6,000 **, depending on condition.

3. **Electrical System Complexity**

- **Faulty sensors** (speed sensor, throttle position sensor).

- **Corroded wiring harnesses** (common in convertibles due to moisture).

- **Alternator or starter failures** (requiring replacement parts).

- Diagnosing electrical problems often requires specialized tools and expertise.

4. **Suspension and Steering Wear**

- The **ball joints, bushings, and shocks** wear out over time, leading to **poor handling, clunking noises, or excessive play**. Replacing these components can be labor-intensive and costly.

5. **Fuel and Emissions Concerns**

- The V8 is **thirsty** (around **18 22 MPG highway**), and modern emissions regulations may require modifications if the car is driven frequently in urban areas.

- **Lead-free fuel** can cause **carbon buildup** in the intake, reducing performance unless the engine is regularly maintained.

6. **Convertible-Specific Challenges**

- If buying a **convertible**, the **soft top mechanism** is prone to failure (seals, cables, and electrics can degrade). Replacing a top can cost **$2,000 $4,000**.

- **Rust** is a common issue in the **floor pans, rocker panels, and rear quarter panels**, especially in older examples.

7. **Limited Modern Safety Features**

- The 560SL lacks **modern safety standards** (no ABS, airbags, or advanced driver aids). While this is part of its charm, it means **higher insurance costs** and **less protection in a collision**.

8. **Finding Qualified Mechanics**

- Unlike modern cars, **few mechanics specialize in pre-1990s Mercedes**. Finding a reputable restorer or mechanic familiar with the 560SL can be difficult, especially in non-classic car hubs.

9. **Storage and Insurance Expenses**

- Classic cars require **proper storage** (garage, climate-controlled) to prevent rust and electrical issues, adding to ownership costs.

- **Insurance premiums** are high due to the car s value and potential repair costs.

10. **Time-Consuming Restoration (If Needed)**

- If the car is **not already restored**, bringing it to showroom condition can take **years** and **thousands of dollars** in labor and parts.

---

### **Ending Conclusion**

The **Mercedes-Benz 560SL (R126) with a 722.313 transmission** is a **fantastic classic car** for enthusiasts who appreciate luxury, performance, and timeless design. However, it is **not a practical daily driver** due to its **high maintenance demands, potential transmission issues, and electrical quirks**.

If you are **passionate about classic cars, willing to invest time and money in maintenance, and enjoy the challenge of restoring and owning a piece of automotive history**, this car is an excellent choice. On the other hand, if you prioritize **convenience, reliability, and lower ownership costs**, a modern luxury car or a well-maintained modern classic (e.g., E320, S55 AMG) may be a better fit.

---

### **Recommendation**

- **Get a full pre-purchase inspection** from a **Mercedes specialist** (preferably one experienced with R126 models).

- **Low mileage** (under 60,000 miles).

- **Service records** proving regular maintenance (oil changes, transmission fluid, suspension work).

- **No major rust** (especially in convertibles).

- **A transmission that shifts smoothly** (no slipping or rough engagement).

- **Known transmission failures** (check for torque converter leaks or slipping).

- **Electrical gremlins** (test all lights, gauges, and accessories).

- **Neglected suspension or steering** (excessive play or clunking noises).

- **Budget for the worst-case scenario** (transmission rebuild, suspension refresh, electrical overhaul).

- **Consider a coupe over a convertible** if rust and top maintenance are concerns.

- **Join classic Mercedes-Benz forums** (e.g., MB500SL.com, MercedesBenzClub.com) for advice on parts sourcing and restoration tips.

- If the **722.313 transmission** is a dealbreaker, look for a **560SL with a manual transmission (if available)** or a **later model (R129 560SL, 1991 1995)**, which has a more modern **722.6** transmission.

- If you want a **more modern classic luxury car**, consider a **Mercedes-Benz E320 (W124, 1985 1995)** or **S55 AMG (1994 1998)**, which are more reliable and easier to maintain.

### **Final Verdict**

The **560SL is a dream car for the right owner** someone who **loves classic Mercedes-Benz, understands its quirks, and is prepared for the challenges**. If you re **serious about owning one**, buy the best example you can afford, **invest in maintenance early**, and enjoy the journey. However, if you re looking for a **low-stress, reliable luxury car**, this may not be the best choice.

Details:

Please refer to pictures for item condition.

part #: r1262721108 prices

• $120.00-$200.00

specifications autotransmissionsgo:

• for models: 560sl
• for makes: Mercedes
• for years: 1986-1991
• mpn: R1262721108
• type: Automatic Transmission
• oe/oem part number: Center Shaft
• universal fitment: No
• country of origin: Germany

payments autotransmissionsgo:

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

shipping autotransmissionsgo:

• class: Standard
• type: Fixed
• transit: 3-8 Days
• service: Standard
• cost: $10.00

offer autotransmissionsgo:

• started: April 8, 2026
• availability: In Stock
• sold: 0
• best offers: True
• quantity: 1
• options: Ship-to-home

seller autotransmissionsgo:

• city: East Setauket, New York
• rating: 100.0%
• # reviews: 21678

returns autotransmissionsgo:

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

general autotransmissionsgo:

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

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