1. Automatic Transmissions Products
  2. sku: 23623317264588604
  3. MERCEDES E450

MERCEDES 725-270-46-18-87 Transmission Benz

fits make: Mercedes. year: 2018–2020.

725-270-46-18-87 Mercedes-benz Genuine Transmission

( Model: E450 S450 E400 ), ( Part Type: Transmission ), ( Genuine Oem: Yes ), ( Oem Part Number: 725-270-46-18-87 ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Make: Mercedes-benz ), ( Year: 2018 2019 2020 ), ( Parts Included: Only Part Reference 0 On The Diagram Is Included ), ( Replaces Part Number: 213270980180, 213270980187, 725270461880 ), ( UPC: 725270461887 )

Review MERCEDES benz Genuine Transmission fits E450 2018–2020

The **Mercedes-Benz 725.270.46.18.87 transmission** is a meticulously engineered, high-performance automatic transmission designed exclusively for the legendary **W126 and W126-based Mercedes-Benz S-Class models** from the mid-1980s, including the iconic **S-Class (S280, S320, and S420)** and select **E-Class (W123 and W124) variants** equipped with the **M117 V8 engine**. This transmission represents the pinnacle of Mercedes-Benz s **four-speed automatic transmission technology** of its era, blending precision engineering with the brand s signature blend of luxury, reliability, and driving dynamics.

At its core, the **725.270.46.18.87** is a **hydraulically actuated, torque converter-based automatic transmission** featuring a **planetary gearset configuration** with four forward gears and one reverse. The transmission s **gear ratios** are finely tuned to optimize both **low-end torque delivery** critical for the V8 s substantial power output and **high-speed efficiency**, ensuring a seamless and responsive shift experience even under heavy loads. The **first gear** is designed for robust acceleration from a standstill, while the **overdrive fourth gear** enhances cruising efficiency, reducing engine revving at highway speeds a hallmark of Mercedes-Benz s commitment to both performance and comfort.

The transmission s **hydraulic control system** is a masterpiece of precision engineering, incorporating a **mechanical shift linkage** (in manual mode) and a **hydraulic valve body** that regulates fluid pressure to engage the appropriate planetary gears. The **torque converter**, a critical component in automatic transmissions, is engineered to efficiently transfer power from the engine to the transmission while allowing for smooth launches and reduced wear on the drivetrain. The **fluid coupling** within the torque converter also contributes to the transmission s **smooth engagement** and **minimal jerkiness** during upshifts and downshifts, a quality that Mercedes-Benz was particularly proud of in its high-end models.

One of the most distinctive features of the **725.270.46.18.87** is its **robust construction**, incorporating **heavy-duty bearings, precision-machined shafts, and a reinforced housing** to withstand the high torque demands of the **M117 V8 engine** (producing up to **220 286 hp** depending on the model). The transmission s **gearbox casing** is typically cast from **high-strength aluminum or steel**, ensuring durability while maintaining a lightweight profile to enhance overall vehicle performance. The **sealing system** comprising **high-quality gaskets, seals, and a robust oil pump** is designed to prevent leaks, a common issue in aging transmissions, and to maintain optimal hydraulic pressure for smooth operation.

For enthusiasts and restorers, the **725.270.46.18.87** is highly sought after due to its **historical significance** and **performance capabilities**. It is compatible with **Mercedes-Benz S-Class models from the W126 generation (1980 1991)**, including the **S280, S320, and S420**, as well as certain **E-Class (W123 and W124) models** with the **M117 V8**. When properly maintained, this transmission delivers **exceptional shift quality**, **minimal slippage**, and **reliable power delivery**, making it a favorite among collectors and performance-oriented drivers who appreciate the **classic Mercedes-Benz driving experience**.

However, like many vintage transmissions, the **725.270.46.18.87** requires **diligent upkeep** to ensure longevity. Regular **fluid changes** (using **Mercedes-Benz ATF 7.25 or a high-quality alternative**) are essential to prevent **slippage, overheating, and premature wear** on the torque converter and clutch packs. The **hydraulic system** should be inspected for **leaks, worn seals, or failing solenoids**, while the **gearbox itself** may benefit from **rebuilding or refurbishment** if signs of **internal wear, gear pitting, or bearing failure** are detected. Many specialists recommend **rebuilding the transmission** every **50,000 100,000 miles** to restore peak performance, especially in high-mileage examples.

For those seeking to restore or upgrade their **W126 S-Class**, the **725.270.46.18.87 transmission** remains a **highly desirable component**, offering a **perfect blend of vintage charm and mechanical excellence**. Whether used in a **showroom-ready classic** or a **street-legal performance machine**, this transmission embodies the **engineering prowess of Mercedes-Benz in the 1980s**, delivering **smooth, precise shifts** that are as satisfying today as they were when first introduced. With proper care, it continues to be a **cornerstone of Mercedes-Benz heritage**, ensuring that the **S-Class s legendary driving experience** remains intact for future generations of enthusiasts.

### **Pros and Cons of Buying a Mercedes-Benz 725 (W126) with a 270-46-18-87 Transmission**

The Mercedes-Benz W126 725 (1985 1991) is a classic luxury sedan known for its refined engineering, powerful V8 engine, and iconic design. The **270-46-18-87 transmission** is a **4-speed automatic** (often referred to as the "4G" or "4G-ET") with electronic control, introduced in later models for improved performance and smoothness. Below is a detailed breakdown of its advantages and drawbacks.

---

### **Pros**

1. **Superior Performance and Power Delivery**

- The **5.0L V8 (M117/M117.916)** in the 725 produces **279 306 hp** (depending on model year and tuning), making it one of the most powerful Mercedes sedans of its era.

- The **270-46-18-87 transmission** is a refined evolution of the earlier **4G-ET** (270-46-18-86), featuring **electronic shift control** for quicker, more precise gear changes.

- Better **torque conversion** and **downshifting** compared to earlier automatics, improving acceleration and driving feel.

2. **Electronic Shift Control (ET) Advantages**

- The **ET (Electronic Transmission)** system allows for **faster upshifts and downshifts**, reducing lag and improving responsiveness.

- Some models include a **"Sport Shift"** mode, enhancing engagement for enthusiasts.

- More stable **cruise control** and **adaptive shifting** compared to earlier mechanical automatics.

3. **Reliability Improvements Over Earlier Models**

- The **270-46-18-87** was introduced in **1987** (replacing the 270-46-18-86) to address some **fluid slippage and harsh shifting** issues found in earlier versions.

- The **torque converter** and **valve body** were refined, reducing common failure points like **stuck solenoids** or **fluid starvation**.

- Still requires **proper maintenance** (fluid changes every **30,000 50,000 miles**), but is generally more durable than the **4G-ET (86)**.

4. **Classic Mercedes Luxury and Build Quality**

- The **W126 725** is a **premium luxury sedan** with **handcrafted interiors**, **power everything**, and **advanced features** for its time (e.g., **air suspension, cruise control, central locking**).

- The **V8 engine** is **reliable if maintained**, with **timing chain** (no belt replacement) and **forged internals** in later models.

- **Resale value** remains strong among classic Mercedes enthusiasts.

5. **Driving Experience and Handling**

- The **4G-ET transmission** provides a **smoother, more engaged** driving experience compared to earlier automatics.

- When paired with **air suspension (optional)**, the ride is **luxurious yet responsive**.

- The **V8 s low-end torque** makes it **easy to drive** while still offering **strong acceleration**.

6. **Aftermarket and Tuning Potential**

- The **M117 engine** is **well-supported** by aftermarket parts (e.g., **cams, headers, fuel systems**).

- **ECU tuning** can increase power **without major engine work**, making it a **cost-effective performance upgrade**.

- **Transmission modifications** (e.g., **stiffer valve body, upgraded torque converter**) can further enhance performance.

7. **Nostalgia and Collectibility**

- The **W126 725** is a **highly sought-after** classic, especially in **low-mileage condition**.

- Ownership provides **prestige** and **driving enjoyment** for enthusiasts who appreciate **pre-1990s German engineering**.

---

### **Cons**

1. **Complexity and Maintenance Costs**

- The **4G-ET transmission** is **more complex** than a manual, requiring **specialized knowledge** for repairs.

- **Common issues** include:

- **Stuck or failing solenoids** (can cause **harsh shifts or no shifting**).

- **Torque converter slippage** (if fluid is neglected).

- **Valve body wear** (leading to **erratic shifting or delayed engagement**).

- **Repair costs** can be **high** if not done by a **Mercedes specialist**.

2. **Transmission Fluid Degradation Over Time**

- The **270-46-18-87** was designed for **heavy-duty use**, but **old fluid** can **burn up** and **deposit sludge**, clogging solenoids.

- **Fluid changes are critical** **ATF should be changed every 30,000 50,000 miles** (or **every 3 5 years** if unused).

- **Failure to maintain fluid** leads to **premature failure** of the **torque converter, clutch packs, or valve body**.

3. **Electronic Failures**

- The **ET system** relies on **electronic sensors and solenoids**, which can **fail over time**.

- **Common electronic issues**:

- **Shift solenoids sticking** (causing **jerky shifts or no upshifts**).

- **Transmission control module (TCM) failures** (requiring **reprogramming or replacement**).

- **Speed sensor malfunctions** (leading to **incorrect gear selection**).

- **Diagnosing electronic problems** requires **OBD-I tools** and **Mercedes-specific knowledge**.

4. **Weight and Fuel Consumption**

- The **W126 725** is **heavy** (around **4,200 4,500 lbs**), which **reduces fuel efficiency**.

- **MPG is poor** ( **12 15 city / 16 18 highway** in automatic form).

- **Fuel costs** add up, especially for **high-mileage owners**.

5. **Rust and Structural Issues (Common in Older Examples)**

- Many **pre-1990s Mercedes** suffer from **rust**, particularly in:

- **Wheel wells**

- **Subframe**

- **Rear quarter panels**

- **Body rust** can **compromise structural integrity**, leading to **expensive repairs**.

- **Air suspension models** may have **leaking seals or worn-out springs**, requiring **replacement**.

6. **High Ownership Costs**

- **Parts are expensive**, especially **transmission components** (e.g., **torque converter, valve body, solenoids**).

- **Labor costs** for Mercedes specialists are **high** compared to modern vehicles.

- **Insurance premiums** are **significantly higher** than for modern sedans.

7. **Limited Modern Compatibility**

- **OBD-I diagnostics** are **less user-friendly** than modern systems.

- **Aftermarket support** (e.g., **OBD-II scanners, diagnostic tools**) is **less advanced** than for newer cars.

- **Electrical issues** (e.g., **fuse failures, wiring problems**) can be **difficult to diagnose**.

8. **Potential for Hidden Problems**

- **Pre-purchase inspection is crucial** many **725s** have:

- **Worn-out suspension components** (ball joints, bushings, shocks).

- **Leaking power steering or cooling systems**.

- **Timing chain stretch** (if not maintained).

- **Salvage or poorly restored examples** can have **hidden mechanical issues**.

---

### **Conclusion**

The **Mercedes-Benz W126 725 with a 270-46-18-87 transmission** is a **fantastic classic car** for those who appreciate **luxury, power, and driving enjoyment**. The **4G-ET automatic** is a **significant upgrade** over earlier models, offering **smoother shifts, better performance, and electronic control** making it one of the **best automatics** in the W126 lineup.

However, **ownership comes with challenges**:

- **High maintenance costs** (especially for the transmission).

- **Complexity** in repairs (requiring **specialized knowledge**).

- **Potential for rust, electrical issues, and hidden problems** if not properly inspected.

- **Poor fuel economy and high insurance costs**.

### **Recommendation**

**Buy the W125 725 with a 270-46-18-87 transmission if:**

You **prioritize driving enjoyment** and **classic luxury**.

You are **prepared for high maintenance costs** and have **budgeted for repairs**.

You **plan to restore or maintain it properly** (regular **transmission fluid changes, inspections**).

You **enjoy working on cars**

Details:

Electrical parts are not returnable. Parts must be resalable and in the original packaging. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Genuine Mercedes-Benz Transmission 725-270-46-18-87: Parts: S450 4 mastic.

With 4-mastic.

part #: e450 price

  • $1510.88

specifications autotransmissionsgo:

  • for makes: Mercedes
  • for years: 2018-2020
  • model: E450 S450 E400
  • part type: Transmission
  • genuine oem: Yes
  • oem part number: 725-270-46-18-87
  • manufacturer warranty: 1 Year
  • fitment type: Direct Replacement
  • make: Mercedes-benz
  • year: 2018 2019 2020
  • parts included: Only Part Reference 0 On The Diagram Is Included
  • replaces part number: 213270980180, 213270980187, 725270461880
  • upc: 725270461887

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

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  • options: Ship-to-home
  • quantity: 1
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  • started: April 26, 2026

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  • cost: $1031.25
  • class: Freight
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for makes: mercedes, for years: 2018-2020, part type: transmission, genuine oem: yes, oem part number: 725-270-46-18-87, manufacturer warranty: 1 year, fitment type: direct replacement, year: 2018 2019 2020, parts included: only part reference 0 on the diagram is included, replaces part number: 213270980180, 213270980187, 725270461880,
manufacturer: mercedes-benz, category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23623317264588604,
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