MINI 678435701 Automatic Transmission Gearbox 2.0L

( Brand: Mini ), ( Manufacturer Part Number: 678435701 ), ( Country Of Origin: United Kingdom ), ( Type: Automatic Transmission ), ( Ipn: 14 15 ), ( Manufacturer Warranty: 6 Months ), ( Fitment Type: Direct Replacement ), ( Tag : Db4770 )

Review MINI 2.0l Automatic Transmission Gearbox Oem fits COOPER 2014–2015

The **Mini 678435701 14-15 Cooper S 2.0L Automatic Transmission Gearbox** is a meticulously engineered component designed to deliver uncompromising performance and reliability for the iconic **R56 Mini Cooper S** produced between the model years **2014 and 2015**. This gearbox is a precision-crafted **6-speed automatic transmission**, built to seamlessly integrate with the **2.0L NA (naturally aspirated) R20 engine**, producing a potent **228 horsepower and 223 lb-ft of torque**, ensuring a dynamic yet refined driving experience. The transmission itself is a refined evolution of BMW s **Getrag GS6-55SZ** design, optimized for smooth shifting, efficient power delivery, and durability under the demanding conditions of spirited driving. Its robust construction features high-quality **steel and aluminum alloys**, along with **precision-machined gears and a reinforced housing**, which work together to minimize wear while maximizing torque transfer. The **automatic transmission control system** employs a sophisticated **electronic shift control (ESC)** and **torque converter** for seamless engagement, allowing for effortless acceleration while maintaining responsiveness even under heavy loads. This gearbox is particularly well-suited for enthusiasts seeking to restore or upgrade their **Mini Cooper S**, as it is fully compatible with the original drivetrain specifications, ensuring an authentic yet modernized performance. Whether used in a **full restoration project** or as a **direct replacement for a worn-out transmission**, this unit is engineered to restore the **sporty, nimble handling** that defines the Cooper S, all while benefiting from modern advancements in durability and efficiency. Its compact yet robust design fits seamlessly into the Mini s underhood architecture, making it an ideal choice for those who demand both **performance and reliability** without sacrificing the vehicle s signature character.

### **Pros and Cons of Buying a Mini Cooper 2.0L (R56/R57) with Automatic Transmission (2014 2015 Models)**

1. **Reliability of the 2.0L Engine**

- The **N54 (R56) and N55 (R57) 2.0L turbocharged inline-4 engines** are well-regarded for their durability, especially when maintained properly. With regular oil changes and attention to turbocharger health, these engines can easily exceed **200,000 miles** with minimal issues.

- The **direct injection system** improves efficiency, and the **variable valve timing** enhances performance and fuel economy.

2. **Smooth Automatic Transmission (ZF 6HP26)**

- The **6-speed automatic transmission** is a robust unit, commonly found in BMW and Mini models. When properly serviced, it offers **smooth shifting** and can last well beyond **150,000 miles** if fluid changes are done every **60,000 100,000 miles**.

- The **twin-scroll turbo** and **adaptive shift programming** provide a balanced driving experience, making it suitable for both city and highway use.

3. **Mini s Unique Design & Driving Dynamics**

- The **R56 (2014) and R57 (2015) Cooper models** retain the **iconic Mini shape**, offering a **compact yet sporty** driving experience.

- The **front-wheel-drive layout with rear-wheel assist (RWD models)** provides **precise handling**, making it enjoyable for both daily driving and light spirited motoring.

- The **low center of gravity** and **lightweight chassis** contribute to **better maneuverability** in tight spaces compared to larger cars.

4. **Good Fuel Economy for a Turbocharged Engine**

- The **2.0L turbo engine** achieves **around 25 30 MPG in the city and 35 40 MPG on the highway**, which is respectable for a turbocharged car of its class.

- **Start-stop technology (in some models)** further improves fuel efficiency in stop-and-go traffic.

5. **Aftermarket & Customization Potential**

- Mini has a **strong aftermarket support**, with availability of **tuning options (e.g., MHD, MiniMotorsport), suspension upgrades, and aesthetic modifications**.

- The **open platform (BMW N5x engines)** allows for **easy modifications**, including **turbo upgrades, exhaust tweaks, and ECU remapping** for better performance.

6. **Resale Value & Brand Appeal**

- Mini retains a **strong brand loyalty**, and well-maintained **2014 2015 Coopers** still hold **decent resale value**, especially in **RWD or S models**.

- The **limited production runs** of certain trims (e.g., **John Cooper Works, Cooper S**) make them **collectible** over time.

7. **Comfortable Interior & Tech Features**

- The **interior is well-built**, with **quality materials** (especially in higher trims) and **ergonomic controls**.

- **Standard features** include **Bluetooth, USB ports, climate control, and a decent infotainment system** (though the screen can be outdated by modern standards).

- **Heated seats (optional in base models, standard in higher trims)** and **good sound insulation** contribute to a **refined cabin experience**.

---

1. **Potential Turbocharger & Oil Consumption Issues**

- The **N54/N55 engines** are prone to **oil consumption** if not maintained properly. Some owners report **burning oil at 1 2 quarts per 1,000 miles** if the **PCV system, valve seals, or piston rings** wear out.

- **Turbocharger failure** can occur if **oil changes are neglected** or if the **turbo is not allowed to cool properly** (e.g., short trips without proper warm-up).

- **Solution:** Stick to **full synthetic oil (5W-30 or 5W-40), change oil every **5,000 7,500 miles**, and monitor oil levels regularly.**

2. **Transmission & Fluid Maintenance**

- The **ZF 6HP26 automatic transmission** is generally reliable but **requires strict fluid changes** (every **60,000 100,000 miles**).

- **Neglecting transmission fluid** can lead to **rough shifting, overheating, or premature failure**.

- **Solution:** Use **ZF or BMW-approved automatic transmission fluid (ATF)** and follow a **strict maintenance schedule.**

3. **Electrical & Infotainment Glitches**

- Some **2014 2015 Minis** suffer from **software bugs in the infotainment system**, including **freezing, slow response, or Bluetooth connectivity issues**.

- **Power window or door lock malfunctions** can occur due to **corrosion or wiring issues** (common in older models).

- **Solution:** Keep software updated (if possible) and address **electrical gremlins early** before they worsen.

4. **Suspension Wear & Road Noise**

- The **Mini s suspension is stiff by default**, which can lead to **uneven tire wear** and **excessive road noise** over time.

- **Struts and bushings** may wear out around **50,000 80,000 miles**, requiring replacement for a **smoother ride**.

- **Solution:** Get a **suspension inspection every 30,000 50,000 miles** and consider **coilover upgrades** for better comfort.

5. **Higher Maintenance Costs Than Average**

- Mini parts and labor can be **more expensive** than mass-market brands due to **limited availability and specialized labor**.

- **Turbocharger replacement ( $1,500 $2,500), transmission rebuilds ( $2,000 $3,500), and suspension work** add up quickly.

- **Solution:** Budget for **at least $1,000 $1,500/year in maintenance** beyond basic upkeep.

6. **Rust & Corrosion Risks (Especially in Snowy Regions)**

- The **wheel arches, sills, and underbody** are prone to **rust** if the car is exposed to **salt, moisture, or poor undercoating**.

- **2014 2015 models** had **some rust issues** in certain regions, particularly in **lower body panels**.

- **Solution:** Inspect for **rust regularly**, apply **undercoating**, and **wash the undercarriage** after winter driving.

7. **Limited Rear Legroom & Practicality**

- The **compact size** means **less cargo space** (around **10.6 cu. ft. behind seats**) and **tight rear legroom** ( 34 inches).

- **Trunk space is small** ( 11.7 cu. ft.), making it **less ideal for large purchases or road trips with luggage**.

- **Solution:** Only suitable for **single occupants or couples with minimal gear.**

8. **Depreciation & Insurance Costs**

- While Mini holds value better than some brands, **insurance premiums** for a **sporty, turbocharged car** can be **higher than average**.

- **Theft risk** is also a concern, as Minis are **popular with thieves** due to their **resale value and parts demand**.

- **Solution:** Park in a **secure garage**, consider **anti-theft devices**, and shop around for **insurance quotes.**

---

### **Final Conclusion & Recommendation**

**Value driving dynamics and fun over pure practicality.**

**Are willing to maintain the car properly (oil changes, transmission fluid, turbo care).**

**Appreciate Mini s unique styling and aftermarket potential.**

**Don t mind slightly higher maintenance costs for a premium driving experience.**

- **Urban drivers** who want a **compact, stylish, and engaging** car.

- **Enthusiasts** who enjoy **tuning and modifying** their vehicle.

- **Owners who prioritize **joy of driving** over **maximum space or fuel efficiency.**

You **need a practical, family-friendly car** with **large cargo space.**

You **can t afford or don t want to maintain** a **turbocharged engine and automatic transmission.**

You **live in a harsh climate** (salt, extreme cold) and **won t address rust prevention.**

You **prefer a bulletproof, low-maintenance** car (e.g., Toyota, Honda).

The **Mini Cooper 2.0L (2014 2015) with automatic transmission** is a **fantastic car for the right buyer**

Details:

Decent pricing also. Contact for fitment. Item arrived securely packaged, as described. Naturally, my gently used vehicle was missing the Owners Manual.

How do people live, right. The higher than average shipping cost was offset by a lower price. Packaging was exceptional. This reliable vendor provided a great price, with fast shipping.

Packaging was Minimal, yet effective. Great purchase experience. Wide Range of Parts. This item is used but in good working condition.

It has normal wear of use because it is a used part. Genuine Second-hand Parts for Every Premium Brand 14-15 Mini Cooper 2.0L Automatic Transmission Gearbox OEM. So I sourced this older, complete Manual set for my make and model. Pricing was a great value.

I ve purchased several times from this vendor and I m sure I ll be purchasing again. Shipping was super fast, I received the item next day. All used items will show normal signs of use such as nicks, scuffs, and scratches. Item arrived earlier than the expected date.

Key Features: Tag Number DB4770, Year/Year Range, Make Mini, model Cooper, Sub model, Series. Item is exactly what was described. Product in pristine condition as described, super fast shipping and great packaging, value communication. Quality Assurance.

The Manual should never leave the Glove Compartment so, ya know, its there for maybe new owners down road. All parts are tested and inspected for reliability performance. Unfortunately I ordered an item that already which the mistake was mine. Fast Reliable.

Warranty Accepted within 6 months of purchase. Super fast shipping even with so oversized packages and good communication. The price was fair and competitive.

part #: 678435701 prices

• $26.10-$218.75

specifications autotransmissionsgo:

• for models: Cooper
• for years: 2014-2015
• brand: Mini
• mpn: 678435701
• country of origin: United Kingdom
• type: Automatic Transmission
• ipn: 14 15
• manufacturer warranty: 6 Months
• fitment type: Direct Replacement
• tag : Db4770

returns autotransmissionsgo:

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

general autotransmissionsgo:

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

shipping autotransmissionsgo:

• cost: $275.00
• class: Freight
• service: Flat Rate Freight
• type: Fixed

seller autotransmissionsgo:

• rating: 99.5%
• city: West Sacramento, California
• # reviews: 59393

payments autotransmissionsgo:

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

offer autotransmissionsgo:

• started: June 5, 2026
• best offers: True
• sold: 0
• availability: In Stock
• quantity: 1
• options: Ship-to-home

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