MERCEDES Automatic Transmission 400-51284 Benz 37K LKQ341841257

( Part Type: Transmission ), ( Ipn: 400-51284 ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 6 Month ), ( Warranty Length: 6 Month Warranty ), ( Vehicle Transmission Type: Auto ), ( Partout Id: A-116071041 ), ( Pop Mpn: 1712708700 ), ( Pop Other Part Number: 1712707200 ), ( Used Engine Mileage Range: Low Mileage , 000 74, 999 Miles )

Review MERCEDES benz Series Automatic Transmission Oem 37k Miles fits SLK

The **Mercedes-Benz 400-51284 SLK Automatic Transmission (Part Number: LKQ341841257)** is a high-quality, direct-fit replacement transmission unit designed specifically for select Mercedes-Benz SLK roadsters, ensuring seamless performance and reliability for enthusiasts seeking to restore or upgrade their vehicle s drivetrain. Engineered to meet or exceed OEM standards, this transmission is built with precision-crafted components, including a robust planetary gearset, a durable torque converter, and a reinforced housing that minimizes vibration and maximizes durability. The automatic transmission operates on a sophisticated hydraulic valve body system, delivering smooth shifting and optimal power transfer, whether navigating city streets or cruising along scenic highways. Its robust construction incorporates high-grade steel and precision-machined internals, ensuring longevity even under demanding driving conditions. This transmission is compatible with a range of SLK models equipped with the 3.2L or 3.6L inline-six engines, making it an ideal choice for restorers and mechanics aiming to maintain the iconic driving dynamics of these sporty convertibles. With its direct-fit design, it eliminates the need for extensive modifications, allowing for a straightforward installation process that preserves the original vehicle s performance and aesthetic integrity. Whether used in a classic restoration project or as a reliable replacement for a worn-out unit, this Mercedes-Benz transmission exemplifies the brand s commitment to engineering excellence, delivering both performance and dependability for years of enjoyable driving.

### **Pros and Cons of Buying a Mercedes-Benz 400-51284 SLK (Automatic Transmission, LKQ341841257)**

#### **Pros**

1. **Premium Brand and Prestige** Mercedes-Benz is a well-known luxury automaker with strong resale value and brand recognition. Owning an SLK adds a sense of luxury and exclusivity.

2. **Sporty Roadster Design** The SLK is a convertible coupe with a sleek, aerodynamic design, offering an engaging driving experience. Its low profile and open-top styling make it visually appealing and fun to drive.

3. **Powerful Engine Options** Depending on the variant, the SLK comes with high-performance engines (e.g., V6 or V8) that deliver strong acceleration and a thrilling driving experience. The 5.0L V8 (in some models) provides substantial power for its class.

4. **Automatic Transmission (4G-Tronic or similar)** The automatic transmission offers smooth shifting and ease of use, making it ideal for both city and highway driving. It reduces driver fatigue compared to manual transmissions.

5. **Convertible Convenience** The SLK s soft-top mechanism is generally reliable (though some models have had issues with durability). The ability to switch between open and closed positions quickly enhances versatility.

6. **Comfortable Interior** The cabin is well-appointed with high-quality materials, ergonomic seating, and advanced infotainment systems (depending on the trim). Some models feature leather upholstery, heated seats, and premium audio.

7. **Handling and Driving Dynamics** The SLK is designed for sporty handling, with responsive steering and a well-tuned suspension. It balances comfort and performance well, making it enjoyable for both daily use and spirited driving.

8. **Aftermarket and Customization Potential** As a popular luxury roadster, the SLK has a strong aftermarket presence. Owners can easily find parts, upgrades (e.g., exhaust, suspension, or performance tuning), and accessories.

9. **Potential for Low Mileage or Well-Maintained Examples** If sourced carefully (e.g., from a reputable dealer or private seller with service records), an SLK can be a reliable luxury vehicle with minimal wear.

10. **Nostalgia and Collector s Appeal** Older SLK models (especially from the 2000s 2010s) have a cult following. Some variants (e.g., the AMG SLK) are sought after by collectors, which could increase resale value over time.

---

#### **Cons**

1. **High Maintenance Costs** Mercedes-Benz vehicles, especially older models, are expensive to maintain. Parts, labor, and diagnostics can be costly, and finding qualified mechanics may require extra effort.

- **Soft-top mechanisms** (leaks, jams, or premature failure).

- **Electrical gremlins** (e.g., faulty sensors, infotainment glitches, or wiring problems).

- **Transmission failures** (some automatic transmissions, particularly older 4G-Tronic units, have had reliability issues).

- **Engine wear** (timing chain or belt failures, oil leaks, or carbon buildup in direct-injection engines).

3. **Fuel Efficiency Limitations** The SLK is not known for exceptional fuel economy, especially with V6 or V8 engines. Expect around **15 20 MPG combined** for gas models, which can be costly to operate.

4. **Convertible Top Durability** The soft-top is a common weak point. Over time, it may develop leaks, sagging, or mechanical failures, requiring costly repairs or replacement (retail tops can cost **$3,000 $6,000 **).

5. **Depreciation** Luxury convertibles, including the SLK, depreciate quickly. Even well-maintained examples may not retain value as well as sedans or SUVs.

6. **Limited Practicality** The SLK is a two-seater with minimal cargo space. It s not ideal for families, frequent passengers, or hauling large items. The open-top design also exposes occupants to weather elements.

- **Water leaks** (from the soft-top or windshield) causing electrical or interior damage.

- **Suspension wear** (ball joints, bushings, or struts) leading to handling issues.

- **Exhaust or emissions system failures** (common in older Mercedes).

8. **Insurance Costs** As a luxury sports car, the SLK can be expensive to insure, especially for younger or high-risk drivers.

9. **Market Availability and Scarcity** Some SLK models (e.g., early AMG versions or rare trims) are hard to find, which can drive up prices for desirable examples.

10. **Modern Alternatives May Be Better** Newer Mercedes-Benz convertibles (e.g., the CLA-Class or AMG GT) offer improved reliability, technology, and safety features. Buying an older SLK means missing out on these advancements.

---

### **Ending Conclusion**

The **Mercedes-Benz SLK (400-51284, automatic transmission)** is a compelling choice for buyers who prioritize **luxury, driving enjoyment, and style** over practicality or long-term cost efficiency. It excels as a **weekend or leisure vehicle** for those who appreciate its sporty handling, convertible charm, and premium brand appeal. However, it comes with **significant drawbacks**, particularly **high maintenance costs, reliability risks, and limited practicality**.

- **Soft-top condition** (check for leaks, proper retraction, and wear).

- **Transmission health** (listen for unusual noises, check fluid condition, and verify service history).

- **Electrical systems** (test all lights, sensors, and infotainment).

- **Suspension and steering** (inspect for wear in bushings, struts, or ball joints).

- **Engine and exhaust** (look for leaks, carbon buildup, or emissions issues).

---

### **Recommendation**

- You have a **budget for maintenance and potential repairs** (or access to a trusted mechanic).

- You **prioritize driving enjoyment and luxury** over practicality.

- You plan to **drive it frequently** and enjoy its sporty nature.

- You find a **well-documented, low-mileage example** with a clean service history.

- You re okay with **higher insurance and fuel costs**.

- You need a **practical, low-maintenance vehicle** for daily use.

- You re sensitive to **high repair costs** or don t have access to Mercedes specialists.

- You prefer **modern technology, safety, or fuel efficiency**.

- You re unwilling to **budget for potential soft-top or transmission issues**.

- You prioritize **long-term value retention** over short-term excitement.

- **Newer Mercedes-Benz convertibles** (e.g., CLA-Class Cabriolet, AMG GT) for better reliability and tech.

- **Used BMW Z4 or Audi TT** for a similar driving experience with potentially lower maintenance costs.

- **Luxury coupes** (e.g., Porsche Boxster, Jaguar F-Type) if you want performance without a convertible.

Ultimately, the SLK is a **passion project** rather than a practical purchase. If you re prepared for its challenges and love the idea of owning a classic Mercedes roadster, it can be an incredibly rewarding experience. Otherwise, a more modern or lower-maintenance alternative may be a smarter long-term choice.

Details:

Replace the radiator or cooler if recommended by manufacturer. No photos of the actual transmission are available. Change over sensors as needed. Warranty does NOT cover labor, diagnostic, towing or rental car costs.

Transfer cases are not included with transmission from AWD vehicles. This is NOT a manufacturer part number, and can be disregarded. Will fit: Mercedes-Benz SLK Series 2009 2011 171 Type,.T.; SLK300. Inspect and replace rear seal as needed. This will ensure the cooling system is flowing.

Verify the differential portion of transmission is full fluid. Properly install and index the torque converter completely into front pump. Residential Address - Load is curbside delivery ONLY. In certain types of Transmissions the TCM transmission controlling computer is incorporated with Valve body which may require valve to be replaced.

Someone over 18 must be present for delivery. Warranty does NOT cover labor, diagnostics, towing, rental car, or any other expense related to an item being defective/damaged. Clear all transmission computer codes in the vehicle prior to starting or operating. Fill the transmission with OEM recommended fluids.

ATTENTION: Stock photo shows multiple Transmissions. They will not have any packaging included. To aid in installation, you get to keep your current transmission and all attached accessories. Remove torque converter strap.

This listing is for 1 Transmission ONLY, Warranty covers the transmission case, torque converter included automatic transmissions only and all internal components. Most 4WD some 2WD vehicles must re-learn the shift logic to transmission after installation. Remove all cap-plugs from lines and orifices. Flush the transmission cooler lines and radiator with a power flush machine or an aerosol Cooler Kit.

Replace front seal.

part #: lkq341841257 prices

• $500.00-$1049.95

specifications autotransmissionsgo:

• for models: Slk
• for makes: Mercedes
• part type: Transmission
• ipn: 400-51284
• genuine oem: Yes
• manufacturer warranty: 6 Month
• warranty length: 6 Month Warranty
• vehicle transmission type: Auto
• partout id: A-116071041
• pop mpn: 1712708700
• pop other part number: 1712707200
• used engine mileage range: Low Mileage , 000 74, 999 Miles

offer autotransmissionsgo:

• availability: In Stock
• quantity: 1
• started: May 4, 2026
• sold: 0
• options: Ship-to-home

general autotransmissionsgo:

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

returns autotransmissionsgo:

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

shipping autotransmissionsgo:

• cost: $0.00
• service: Flat Rate Freight
• type: Fixed
• class: Freight

seller autotransmissionsgo:

• rating: 98.6%
• # reviews: 506715
• city: Bennett, Colorado

payments autotransmissionsgo:

• wallet: Google-pay
• other
• credit card: Diners-club

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