MERCEDES A1262705100 Automatic Transmission Auto B3118 Benz 350SDL

( Manufacturer Part Number: A1262705100 ), ( Part Type: Transmission ), ( Features: Oem Original Equipment, Exact Fit Quality ), ( Country Of Origin: Germany ), ( Fitment Type: Direct Replacement ), ( Vintage Part: No ), ( Ipn: B3118 )

Review MERCEDES benz New Oem Automatic Transmission Auto 1262705100 fits 350D 1990–1991

The **Mercedes-Benz A1262705100 Automatic Transmission** is a meticulously engineered, high-performance transmission unit designed exclusively for the **1990 1991 model year 350D and 350SDL** vehicles, both of which are powered by the legendary **OM617 diesel engine**. This transmission is a cornerstone of the **W126 generation**, renowned for its blend of luxury, durability, and cutting-edge automotive technology. Built to exacting standards, the **A1262705100** is a **four-speed automatic transmission** with a **torque converter** and **hydraulic valve body**, optimized to deliver seamless shifting, robust power delivery, and long-term reliability critical attributes for the heavy-duty demands of a diesel-powered Mercedes-Benz.

The transmission features a **helical gear design** in its planetary gearset, ensuring smooth and efficient power transfer while minimizing wear over extended use. Its **hydraulically actuated clutch packs** and **band mechanisms** work in tandem with the **torque converter**, which incorporates a **lock-up clutch** to enhance fuel efficiency by directly engaging the engine and transmission under optimal driving conditions. The **valve body**, a precision-machined component, regulates hydraulic pressure to the clutches and bands, allowing for precise shift control whether during highway cruising, city stop-and-go traffic, or towing heavy loads. This transmission is engineered to handle the **torque output of the OM617 engine**, which produces **170 horsepower and 252 lb-ft of torque**, ensuring that power is delivered with authority while maintaining smooth operation.

One of the standout features of the **A1262705100** is its **robust construction**, incorporating **cast aluminum housing** reinforced with **steel components** where necessary to withstand the stresses of diesel engine power. The **sealing system**, including **o-rings, gaskets, and the transmission pan gasket**, is designed to prevent leaks, ensuring that the **ATF (Automatic Transmission Fluid)** remains contained and properly lubricates all moving parts. The transmission also incorporates a **shift solenoid pack**, which controls the flow of hydraulic fluid to the valve body, allowing for **electronic shift programming** that enhances responsiveness and reduces wear. This system is calibrated to work seamlessly with the **1990 1991 model s electronic engine management**, ensuring optimal performance and shift quality.

For owners and mechanics alike, the **A1262705100** is a transmission that embodies **Mercedes-Benz engineering excellence**, balancing **performance, durability, and refinement**. Whether restoring a classic **350D** or maintaining a well-loved **350SDL**, this transmission is a critical component that, when properly serviced with **high-quality ATF (such as Mercedes-Benz ATF 7.5 or equivalent)**, can provide **decades of trouble-free service**. Its compatibility with the **W126 chassis** makes it a sought-after part for enthusiasts and professionals who demand nothing less than the highest standards of automotive craftsmanship. With its **proven reliability, smooth operation, and robust build**, the **A1262705100** remains a testament to Mercedes-Benz s legacy of engineering vehicles that are as capable as they are luxurious.

### Pros and Cons of Buying a 1990-1991 Mercedes-Benz 350D/350SDL with the A1262705100 Automatic Transmission

#### **Pros**

1. **Reliability of the Engine and Transmission**

The 350D (OM617 diesel) and 350SDL (OM616 diesel) engines from this era are known for their durability. The A1262705100 automatic transmission, part of Mercedes-Benz s 4-speed hydraulic automatic system, was robust for its time and could last well over 200,000 miles with proper maintenance. Many of these transmissions are still functional today, especially if they have been rebuilt or maintained regularly.

2. **Strong Performance**

The 3.5L diesel engines (350D: 170 hp, 350SDL: 163 hp) provided respectable power for their time, offering good towing capability and smooth acceleration. The diesel fuel efficiency was also a significant advantage compared to gasoline engines of the era.

3. **Classic Mercedes-Benz Build Quality**

Mercedes-Benz vehicles from the 1990s, particularly the W124 series (which the 350D/350SDL belongs to), were built with solid construction. The chassis, suspension, and bodywork were designed to last, and many of these cars still hold their value well.

4. **Availability of Parts and Service**

As a well-known luxury brand, parts for the 350D/350SDL are still relatively easy to find, though prices may be higher than for more common vehicles. There are also mechanics familiar with Mercedes-Benz systems, though specialized knowledge may be required for transmission or engine issues.

5. **Potential for Restoration or Modification**

If you are interested in classic cars, the 350D/350SDL can be a rewarding project. The W124 platform allows for various upgrades, including engine swaps (e.g., OM617 to OM617A for better fuel economy), suspension modifications, and interior refinements.

6. **Low Running Costs (Compared to Gasoline Alternatives)**

Diesel fuel was cheaper than gasoline in the 1990s, and while diesel prices have fluctuated, the 350D/350SDL can still offer better fuel economy than many gasoline-powered luxury cars from the same era.

7. **Resale Value and Collectibility**

The W124 series, particularly the diesel models, has gained a cult following over the years. Well-maintained examples can appreciate in value, especially if they are low-mileage or have been restored.

---

#### **Cons**

1. **Transmission Issues**

- **Slippage or hesitation** during acceleration, often due to worn clutches or torque converter issues.

- **Leaking fluid**, which can lead to overheating and further damage.

- **Rebuild costs** can be high, often ranging from $2,000 to $4,000 depending on the extent of the work. Some owners opt for a replacement transmission, which can be expensive.

- **Electrical gremlins**, such as faulty solenoids or sensors, which may require diagnostics and repairs.

If the transmission has not been rebuilt or maintained, it may be a significant risk factor.

2. **Diesel Emissions and Modern Regulations**

Older diesel engines, particularly pre-1994 models, do not meet modern emissions standards. In some regions, driving a diesel vehicle without modifications (such as a DPF or EGR delete) may be restricted or illegal. Check local regulations before purchasing.

3. **High Maintenance Costs**

Mercedes-Benz vehicles, even from the 1990s, can be expensive to maintain. Regular services such as valve adjustments, fuel injection cleaning, and transmission fluid changes are necessary to keep the car running smoothly. Ignoring maintenance can lead to costly repairs down the line.

4. **Rust and Bodywork Concerns**

Many W124 models, especially those from the early 1990s, suffer from rust, particularly in the wheel arches, sills, and undercarriage. A thorough inspection of the body and chassis is essential to avoid future corrosion-related issues.

5. **Comfort and Modern Standards**

The 350D/350SDL is not equipped with modern comfort features such as advanced air suspension, adaptive damping, or modern infotainment systems. The ride can be firm compared to today s luxury vehicles, and the interior may feel dated or worn if not well-maintained.

6. **Fuel Economy Limitations**

While diesel engines were efficient in the 1990s, modern diesel engines (especially turbocharged ones) offer significantly better fuel economy. The 350D/350SDL will not match the efficiency of a contemporary diesel or hybrid vehicle.

7. **Parts and Labor Costs**

While parts are available, labor costs for Mercedes-Benz repairs can be high, especially if you take the car to a dealership. Independent mechanics may charge less but may lack the specialized knowledge for certain components.

8. **Potential for Hidden Problems**

- **Engine wear** (e.g., worn camshaft lobes, lifters, or injectors).

- **Suspension components** (e.g., worn bushings, ball joints, or shocks).

- **Electrical issues** (e.g., faulty wiring, sensors, or alternators).

A pre-purchase inspection by a trusted mechanic is highly recommended.

---

### **Conclusion**

Buying a 1990-1991 Mercedes-Benz 350D/350SDL with the A1262705100 automatic transmission can be a rewarding experience if you are prepared for its quirks and potential challenges. The car offers a blend of durability, classic luxury, and diesel efficiency, but it requires careful consideration of its maintenance needs, transmission reliability, and compliance with modern regulations.

If you are looking for a **project car** or a **long-term investment** with a passion for classic Mercedes-Benz, this vehicle can be an excellent choice provided you budget for potential repairs, especially transmission work. On the other hand, if you prioritize **modern comfort, low maintenance, or fuel efficiency**, this car may not be the best fit.

---

### **Recommendation**

- Purchase from a reputable seller with a **complete service history**, especially for the transmission and engine.

- **Budget for a transmission rebuild or replacement** (expect $2,000 $4,000 ).

- **Inspect for rust** thoroughly, particularly in critical areas like the frame and suspension.

- **Test drive carefully** to check for transmission slippage, hesitation, or unusual noises.

- Consider **modifying the engine** (e.g., upgrading to an OM617A for better fuel economy) if you plan to keep the car long-term.

- Ensure the transmission has been **rebuilt recently** and the fluid is fresh.

- Verify that the car meets **local emissions standards** or is prepared for modifications if needed.

- Be prepared for **higher maintenance costs** and factor in the cost of parts and labor.

- Consider **alternative diesel models** (e.g., later W124 models with updated emissions systems) if you want a balance of reliability and modern compliance.

- **Get a pre-purchase inspection** from a Mercedes-Benz specialist or a trusted mechanic.

- **Test drive extensively** to check for transmission smoothness, engine performance, and overall drivability.

- **Compare with other options** such as a later-model diesel Mercedes or a well-maintained luxury sedan from the same era.

Ultimately, the 350D/350SDL is a **great choice for enthusiasts** who appreciate classic Mercedes-Benz engineering and are willing to invest time and money in its upkeep. For casual buyers or those seeking a hassle-free experience, it may be more suitable as a weekend or project car rather than a daily driver.

Details:

Does not come with converter. Fits 1990 1991 350D, 350SDL - late production in. 4 speed auto.

New OEM Mercedes Automatic Transmission new in the crate, never installed.

part #: a1262705100 prices

• $47.00-$273.33

specifications autotransmissionsgo:

• for models: 350d
• for makes: Mercedes
• for years: 1990-1991
• mpn: A1262705100
• part type: Transmission
• features: Oem Original Equipment, Exact Fit Quality
• country of origin: Germany
• fitment type: Direct Replacement
• vintage part: No
• ipn: B3118

returns autotransmissionsgo:

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

seller autotransmissionsgo:

• city: Dahlonega, Georgia
• rating: 99.8%
• # reviews: 66347

shipping autotransmissionsgo:

• class: Freight
• service: Flat Rate Freight
• type: Fixed
• cost: $245.00

payments autotransmissionsgo:

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

general autotransmissionsgo:

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

offer autotransmissionsgo:

• options: Ship-to-home
• availability: In Stock
• started: February 9, 2026
• quantity: 1
• sold: 0

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