1. Automatic Transmissions Products
  2. sku: 23556034727718721
  3. MERCEDES C350

MERCEDES 204-270-51-00-80 Automatic Transmission Benz

fits model: C350. make: Mercedes. year: 2009–2011.

204-270-51-00-80 Mercedes-benz Genuine Remanufactured Automatic Transmission

( Part Type: Transmission ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Make: Mercedes-benz ), ( Year: 2009 2010 2011 ), ( Parts Included: Only Part Reference 0 On The Diagram Is Included ), ( Replaces Part Number: 204270510060, 204270510088 ), ( UPC: 204270510080 )

Review MERCEDES benz Genuine Remanufactured Automatic Transmission fits C350 2009–2011

The **Mercedes-Benz 204-270-51-00-80 automatic transmission** is a precision-engineered hydraulic unit designed exclusively for the legendary **W123 generation** of Mercedes-Benz sedans, coupes, and station wagons produced between 1975 and 1985. This transmission, often referred to as the **4G-Tronic** or **4G-Tronic 5-speed automatic**, represents a pinnacle of automotive engineering from its era, blending robust construction with sophisticated hydraulic and mechanical systems to deliver seamless power delivery and reliability. Built with a **cast aluminum housing** reinforced by high-strength steel components, the transmission is engineered to withstand the demanding torque outputs of the W123 s inline-six and V8 engines, ranging from the **2.7-liter M116** to the **5.0-liter M117** powerplants, ensuring smooth shifting even under heavy loads. At its core, this transmission features a **5-speed gearset**, including a low-range (L) position for enhanced towing capability and improved hill-climbing performance, making it a versatile choice for both daily driving and spirited motoring. The hydraulic control system incorporates a **torque converter with a lock-up clutch**, which engages at higher speeds to improve fuel efficiency while maintaining a near-manual driving feel, a hallmark of Mercedes-Benz s commitment to driver engagement. The **valve body**, a critical component regulating fluid flow and shift logic, is meticulously calibrated to optimize shift quality, minimizing jerkiness and ensuring progressive acceleration. This transmission also incorporates a **mechanical shift linkage** that interfaces directly with the vehicle s steering column, allowing for precise manual override of the automatic functions a feature that Mercedes-Benz pioneered to enhance driver control. Over time, the **204-270-51-00-80** has earned a reputation for durability, with many units enduring well over **200,000 miles** when properly maintained, though like all hydraulic automatics, it demands regular attention to fluid changes and component inspections to prevent premature wear. Whether restored to pristine condition for a classic W123 or repurposed into a modern project car, this transmission embodies the engineering philosophy of its time balancing performance, refinement, and longevity with an unmistakable Mercedes-Benz pedigree.

### Pros and Cons of Buying a Mercedes-Benz with the 204.270.51.00.80 Automatic Transmission

#### **Overview of the Transmission**

The **204.270.51.00.80** is a **7G-Tronic 722.9** automatic transmission, commonly found in Mercedes-Benz models from the **W212 (C-Class), W204 (E-Class), and W166 (S-Class)** generations, particularly those produced between **2011 and 2017**. This transmission is a **7-speed wet-clutch automatic**, known for its smooth operation and advanced shift logic.

---

### **Pros**

1. **Smooth and Precise Shifting**

- The 7G-Tronic is renowned for its **quick, near-instantaneous gear shifts**, providing a seamless driving experience, especially in stop-and-go traffic.

- Unlike older torque-converter automatics, it eliminates the traditional "jerk" associated with traditional automatics.

2. **High Torque Handling**

- Designed to handle **high torque loads** (common in V6 and V8 engines), making it suitable for **E-Class, S-Class, and AMG models**.

- Works well with **turbocharged engines**, reducing lag compared to older transmissions.

3. **Fuel Efficiency & Performance**

- The **adaptive shift logic** optimizes gear selection for better fuel economy in some driving conditions.

- When properly maintained, it can deliver **strong acceleration** without excessive strain.

4. **Durability (When Well-Maintained)**

- If **regularly serviced** (fluid changes, valve body cleaning), this transmission can last **200,000 miles**.

- Many owners report **reliable performance** if the original owner followed maintenance schedules.

5. **Compatibility with Modern Mercedes Systems**

- Works seamlessly with **Mercedes electronic stability control (ESP), traction control, and adaptive cruise control**.

- Supports **start-stop functionality** in some models, improving fuel efficiency.

6. **Aftermarket Support & Repairability**

- Widely available in the **aftermarket**, with **replacement parts, rebuild kits, and remanufactured units** available.

- Skilled mechanics are familiar with its **valve body, solenoids, and torque converter** components.

---

### **Cons**

1. **Complexity & Repair Costs**

- One of the **most expensive transmissions** to repair in Mercedes history due to its **electronic valve body, multiple solenoids, and precise tolerances**.

- **Labor costs** for repairs (especially valve body cleaning or replacement) can exceed **$2,000 $4,000** in the U.S.

2. **Electronic Failures**

- The **valve body and shift solenoids** are prone to **electrical or hydraulic failures**, leading to **rough shifts, delayed engagement, or complete lockup**.

- **No self-diagnostic tools** are readily available for owners requires **Mercedes dealership or specialized shops** for proper coding.

3. **Fluid Sensitivity**

- **Mercedes ATF (e.g., MB 236.14 or MB 236.15)** must be **changed every 60,000 100,000 miles** (or as recommended).

- **Using the wrong fluid** (e.g., conventional ATF) can **destroy the transmission** within **50,000 miles**.

- **Leaks** (from seals, gaskets, or the torque converter) are common and require **expensive repairs**.

4. **Rebuild vs. Replacement Debate**

- **Rebuilding** is **cost-effective** ( $2,500 $3,500) but requires **experienced technicians** to clean the valve body and replace worn components.

- **Remanufactured units** ( $3,000 $4,500 installed) may not last as long as a properly rebuilt original.

- **Full replacement** (if the transmission is beyond repair) can cost **$5,000 $7,000 **, making it a **major financial decision**.

5. **Common Failure Points**

- **Torque converter issues** (slippage, overheating) are frequent, often requiring **full replacement ( $1,500 $2,500)**.

- **Solenoid failures** cause **erratic shifting or no shifting at all**.

- **Clutch pack wear** (in wet-clutch designs) can lead to **delayed engagement or harsh shifts**.

6. **Dealer vs. Independent Shop Reliability**

- **Dealership repairs** are **more expensive** but ensure **OEM parts and proper coding**.

- **Independent shops** may offer **lower costs** but risk **cheap parts or improper diagnostics**, leading to **recurring issues**.

7. **Resale Value & Market Perception**

- The **7G-Tronic s reputation for reliability is mixed** some buyers see it as **high-maintenance**, while others appreciate its **smoothness**.

- **Used market demand** is **moderate**; buyers often **negotiate lower prices** for models with this transmission due to **potential repair costs**.

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### **Signs of Trouble (Before Buying)**

If considering a used Mercedes with this transmission, watch for:

- **Delayed engagement** (long pause when pressing the gas after stopping).

- **Rough or jerky shifts** (especially under load).

- **Transmission slipping** (RPMs spike without acceleration).

- **Warning lights** (e.g., "Check Transmission" or "Service Transmission").

- **Burning smell** (indicates overheating or fluid breakdown).

- **Leaking fluid** (check under the car for dark, oily puddles).

A **pre-purchase inspection (PPI) by a Mercedes specialist** is **highly recommended** it can uncover **hidden issues** that may cost thousands to fix.

---

### **Conclusion & Recommendation**

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

**Buyers who:**

- **Prioritize smooth shifting and driving feel** over long-term reliability.

- **Plan to maintain the vehicle religiously** (fluid changes, valve body service every **60,000 80,000 miles**).

- **Have a budget for potential repairs** (expect **$2,000 $5,000 ** in repairs over the vehicle s life).

- **Prefer a modern automatic** over a manual or older torque-converter automatic.

- **Are buying from a reputable seller** with **service records** proving fluid changes.

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

**Buyers who:**

- **Cannot afford unexpected repairs** (this transmission is **not bulletproof**).

- **Want a low-maintenance, high-reliability used car** (consider **Toyota, Honda, or Lexus automatics** instead).

- **Are buying without a PPI** (risk of **hidden failures**).

- **Plan to keep the car long-term without budgeting for transmission work**.

- **Dislike dealing with electronic diagnostics** (requires **specialized knowledge**).

#### **Final Recommendation**

- **If buying new or CPO:** The **7G-Tronic is a great transmission** when paired with **proper maintenance**. Mercedes dealerships offer **extended warranty options** that can mitigate repair risks.

- **If buying used:**

- **Get a PPI** (costs **$150 $300**) **worth it** to avoid **$3,000 repair bills**.

- **Verify fluid history** **no records red flag**.

- **Check for leaks** (torque converter, seals, pan gasket).

- **Test drive for smoothness** **any hesitation or jerking is a warning sign**.

- **Budget for a rebuild or replacement** **expect to spend $2,500 $5,000** if issues arise.

- **Alternative Considerations:**

- If **reliability is the top priority**, consider **Mercedes models with the 722.6 (older 7-speed) or 9G-Tronic (newer 9-speed)** though the **9G-Tronic is more expensive to repair**.

- For **budget-friendly used automatics**, **Toyota s U660E or Honda s 9-speed** may offer **better long-term value**.

#### **Bottom Line**

The **Mercedes 204.270.51.00.80 (7G-Tronic) is a fantastic transmission when in good condition**, offering **smooth, near-instant shifts** and **strong performance**. However, its **complexity, high repair costs, and maintenance demands** make it **riskier than many other automatics**. **Only buy it if you re prepared for potential expenses and can verify its history.** For most buyers, **a well-maintained used Mercedes with this transmission is a great choice if budgeted properly**, but **it is not a "set-and-forget" automatic**.

Details:

Parts must be resalable and in the original packaging. Electrical parts are not returnable. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer.

part #: c350 prices

  • $1224.03-$7064.80

specifications autotransmissionsgo:

  • for models: C350
  • for makes: Mercedes
  • for years: 2009-2011
  • part type: Transmission
  • genuine oem: Yes
  • manufacturer warranty: 1 Year
  • fitment type: Direct Replacement
  • make: Mercedes-benz
  • year: 2009 2010 2011
  • parts included: Only Part Reference 0 On The Diagram Is Included
  • replaces part number: 204270510060, 204270510088
  • upc: 204270510080

shipping autotransmissionsgo:

  • service: FedEx Ground / FedEx Home Delivery, FedEx 2Day, FedEx Standard Overnight
  • transit: 4-7 Days
  • carrier: FedEx
  • type: Fixed
  • class: Standard, Expedited, One-day
  • cost: $0.00

payments autotransmissionsgo:

  • other
  • credit card: Discover
  • wallet: Paypal

general autotransmissionsgo:

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

offer autotransmissionsgo:

  • availability: In Stock
  • quantity: 1
  • sold: 0
  • options: Ship-to-home
  • started: April 18, 2026

returns autotransmissionsgo:

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

seller autotransmissionsgo:

  • city: Warwick, Rhode Island
  • # reviews: 5598
  • rating: 99.7%
for models: c350, for makes: mercedes, for years: 2009-2011, part type: transmission, genuine oem: yes, manufacturer warranty: 1 year, fitment type: direct replacement, year: 2009 2010 2011, parts included: only part reference 0 on the diagram is included, replaces part number: 204270510060, 204270510088,
manufacturer: mercedes-benz, category: auto parts > car truck parts accessories > transmission drivetrain > automatic transmission, sku: 23556034727718721,
Mercedes C350 Is Similar To:
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3 offers $1224.03–$7064.80 USD
  • Remanufactured. Offer #1 priced at $7064.80 + $138.66 shipping estimate = $7203.46* total. +$138.66 shipping
  • Usato. Offer #2 priced at $1224.03 + $2368.72 shipping estimate = $3592.75* total. OM 651.911. Il colore del veicolo da cui stata rimossa la parteRIDUTTORE Azul.+$2368.72 shipping
  • Remanufactured. Offer #3 priced at $7036.51 + $0.00 shipping estimate = $7036.51* total. FREE SHIPPING

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