INFINITI 31020-X628E Automatic Transmission G37X

( Manufacturer Part Number: 31020-X628E ), ( Type: Automatic Transmission ), ( Universal Fitment: No ), ( Country Of Origin: Japan )

Review INFINITI G37 Sedan Speed Automatic Transmission fits AWD 2012–2013

The **Infiniti G37 2012 2013 (Model Code: 31020-X628E)** represents a refined and dynamic blend of Japanese engineering precision and European-inspired luxury, embodying Infiniti s commitment to delivering a sophisticated yet approachable grand tourer. Built upon the robust **G37 platform**, this front-wheel-drive (FWD) and all-wheel-drive (AWD) model (designated as the **G37 AWD** with the **G37X** variant) features a **3.7-liter V6 engine** (designated **VQ37VHR**) that produces a smooth and responsive **306 horsepower** and **270 lb-ft of torque**, paired seamlessly with a **6-speed automatic transmission** (ZF-sourced) that ensures effortless yet engaging shifts. The AWD system, available in the **G37X**, distributes power intelligently between the front and rear axles, enhancing traction without sacrificing comfort, making it an ideal choice for drivers who demand both performance and versatility across varied road conditions.

The **G37 s exterior design** is a study in understated elegance, with sharp, angular lines that evoke a sense of modern sophistication while maintaining a timeless appeal. The **LED daytime running lights** (on select trims) and **stylish 18-inch alloy wheels** (standard on higher trims) contribute to a commanding yet refined presence, while the **aerodynamic front grille** and **sleek headlamps** (with optional adaptive lighting) ensure both form and function. Inside, the cabin is a masterclass in premium materials, featuring **high-quality leather upholstery**, **soft-touch plastics**, and **ambient lighting** that can be adjusted to create a mood-setting atmosphere. The **infotainment system**, powered by **NissanConnect**, includes a **6.5-inch touchscreen** (with optional navigation) and **Bluetooth connectivity**, while the **Bose premium audio system** (available on higher trims) delivers immersive sound quality that elevates every drive.

Performance-wise, the **G37 AWD** excels in both comfort and capability, with its **all-wheel-drive system** providing enhanced stability on wet or slippery roads without the bulkiness of a traditional AWD vehicle. The **sport-tuned suspension** (available on the **G37X**) offers a firmer ride, allowing for a more engaged driving experience, while the **standard stability control and electronic differential lock** ensure confidence in all conditions. The **7-speed automatic transmission** (on later 2013 models) further enhances smoothness and efficiency, making the G37 a versatile daily driver that doesn t compromise on performance.

Inside, the **G37 s cabin** is designed with both luxury and practicality in mind. The **dual-zone automatic climate control**, **power-adjustable front seats**, and **memory seat settings** ensure personalized comfort for both driver and passenger. The **wood or aluminum trim accents** (on higher trims) add a touch of opulence, while the **rear entertainment system** (with a **6-inch touchscreen**) keeps passengers engaged during long journeys. The **panoramic sunroof** (available on select models) further enhances the sense of spaciousness and openness, making every drive feel like an escape.

Under the hood, the **3.7-liter VQ37VHR V6** is a marvel of modern engineering, featuring **direct injection, variable valve timing, and a high-flow intake system** that ensures a linear power delivery with minimal vibration. The **AWD system** in the **G37X** is particularly noteworthy, as it uses a **viscous coupling** rather than a traditional torque-sensing system, providing seamless power distribution without the complexity of a full-time AWD setup. This makes the G37X an excellent choice for drivers who want AWD capability without the added weight or maintenance concerns of a more complex system.

The **G37 s safety features** are equally impressive, with standard **stability control, traction control, and multiple airbags**, along with **optional advanced safety packages** that include **adaptive cruise control, lane departure warning, and blind-spot monitoring**. These technologies ensure that the G37 is not only a pleasure to drive but also a responsible choice for the modern road.

In summary, the **2012 2013 Infiniti G37 (31020-X628E) and G37X AWD** is a well-rounded grand tourer that seamlessly combines **performance, luxury, and practicality**. Whether cruising along a coastal highway, navigating city streets, or tackling light off-road conditions (thanks to the AWD), this vehicle delivers a **smooth, engaging, and refined driving experience** that sets a new standard for Japanese luxury sedans of its era. With its **premium interior, powerful yet efficient engine, and advanced technology**, the G37 remains a standout choice for discerning drivers who appreciate both style and substance.

### **Pros and Cons of Buying a 2012-2013 Infiniti G37x (G37AWD) with 3.7L Engine, X628E Transmission**

#### **Pros**

1. **Reliable Engine and Performance**

- The 3.7L V6 (VQ37VHR) is a well-regarded engine known for durability, especially in the G37 platform. It produces **290 horsepower** and **270 lb-ft of torque**, providing smooth acceleration and adequate power for daily driving and light towing (up to 3,500 lbs with a proper hitch).

- The **AWD system** improves traction in snow, rain, and off-road conditions, making it a practical choice for drivers in variable climates.

2. **Comfortable and Refined Ride**

- The G37x is designed for comfort, with a **softer suspension tuning** compared to sportier Infiniti models. It handles bumps well and offers a quieter cabin than some competitors.

- The **automatic transmission (X628E, a 6-speed) is generally smooth**, though some owners report minor hesitation under load.

3. **Spacious and Well-Appointed Interior**

- The cabin is **roomy**, with decent headroom and legroom for front and rear passengers. The **premium materials** (leather, wood/aluminum trim) give it a luxury feel.

- Standard features include **cruise control, a CD/MP3 player, and climate control**, while higher trims offer **Bluetooth, backup camera, and heated seats**.

4. **Good Fuel Economy for a V6 AWD**

- Expect ** 18-20 MPG city** and ** 24-26 MPG highway**, which is reasonable for a V6 AWD sedan. Some modifications (like a cold air intake) can improve efficiency slightly.

5. **Resale Value and Brand Reputation**

- Infiniti s reputation for **reliability and luxury** has improved over the years, and the G37x holds its value better than some domestic competitors.

- The **G37 platform** (shared with Nissan s Maxima) is known for longevity, with many examples exceeding **200,000 miles** with basic maintenance.

6. **AWD Advantage in Snow and Wet Conditions**

- Unlike FWD cars, the AWD system provides **better stability in slippery conditions**, making it a safer choice in winter climates.

7. **Affordable Luxury Option**

- Compared to German or Japanese luxury sedans, the G37x offers **similar comfort and features at a lower price**, making it a budget-friendly luxury sedan.

---

#### **Cons**

1. **Transmission Issues (X628E 6-Speed Automatic)**

- Some owners report **rough shifting, delayed engagement, or hesitation** under acceleration, particularly when pulling loads or in stop-and-go traffic.

- **Solenoid failures** and **valve body issues** can occur, leading to higher repair costs if not addressed early.

- **Fluid changes are critical** neglecting them can accelerate wear.

2. **Rear Seat Comfort and Space**

- While the cabin is roomy, **rear seat legroom is tight**, and the seats are **firm**, making long trips uncomfortable for some passengers.

- The **trunk space (13.7 cu. ft.) is small** compared to competitors like the Honda Accord or Toyota Camry, limiting cargo capacity.

3. **Infotainment System Limitations**

- The **basic CD/MP3 player** lacks modern connectivity (no USB, Bluetooth in base models). Upgrading to a **navigation system** requires aftermarket solutions.

- The **infotainment screen is small and outdated** by today s standards.

4. **Maintenance and Repair Costs**

- While the engine is reliable, **AWD systems require more frequent servicing** (differential fluid changes, transfer case maintenance).

- **Infiniti dealership labor rates** can be higher than independent shops, increasing repair costs.

- **Timing chain stretch** (though rare) can lead to **knocking noises** if ignored always check for proper tensioner function.

5. **Fuel Economy Not Exceptional**

- The **V6 AWD combination** means **worse MPG than FWD sedans** (e.g., a 2013 Camry FWD gets 30 MPG highway).

- If fuel efficiency is a priority, a **4-cylinder AWD (like a Mazda6 or Honda Accord AWD)** would be more economical.

6. **Depreciation and Market Availability**

- The G37x is **not as common as a Maxima**, so **parts and used cars may be harder to find** in some regions.

- **Resale value has declined** compared to newer Infiniti models (Q50, Q60), making it less attractive for long-term ownership.

7. **Noise and Vibration in Certain Conditions**

- Some owners report **wind noise at highway speeds** and **engine mounts wearing out**, leading to cabin rattles.

- The **AWD system can introduce slight vibration** through the pedals, though this is usually minor.

8. **Limited Aftermarket Support**

- Unlike the Maxima (which has a strong aftermarket), **G37x parts and modifications are harder to find**, making upgrades (e.g., exhaust, suspension) more difficult.

---

### **Conclusion**

The **2012-2013 Infiniti G37x (G37AWD) with the 3.7L V6 and X628E transmission** is a **solid, comfortable luxury sedan** that excels in **AWD traction, ride quality, and long-term durability** provided it is **properly maintained**. It is best suited for drivers who:

- Prioritize **comfort and refinement** over sportiness.

- Need **AWD capability** for snow or off-road use.

- Want a **budget-friendly luxury sedan** with decent resale value.

- Are willing to **budget for transmission maintenance** and **infotainment upgrades**.

- Need **exceptional fuel economy** (consider a 4-cylinder AWD).

- Require **modern tech features** (Bluetooth, USB, navigation).

- Prefer **easier maintenance or aftermarket support** (Maxima may be better).

- Plan to **tow heavily** (the G37x is not a true tow vehicle).

---

### **Recommendation**

If you find a **well-maintained example** (with **service records, fresh transmission fluid, and no transmission complaints**), the **G37x is a great buy** especially if you live in a **snowy or wet climate** and want a **comfortable, reliable AWD sedan**.

**Test the transmission** shift through gears smoothly, check for hesitation.

**Inspect AWD components** ensure no fluid leaks, proper fluid levels.

**Check for timing chain noise** listen for knocking under load.

**Verify maintenance history** transmission fluid changes are **critical**.

**Consider an independent mechanic inspection** focus on the **transmission, AWD system, and suspension**.

- **A 2013 model** (minor refinements over 2012).

- **AWD models with lower mileage** (

- **A vehicle with a **service manual** to track future maintenance.

- If **fuel economy is a priority**, look at a **2013 Honda Accord AWD** or **Toyota Camry AWD**.

- If you want **more modern tech**, consider a **used 2015 Infiniti Q50** (though it s more expensive).

- If you need **better aftermarket support**, a **Nissan Maxima** (same platform) may be easier to modify.

**Final Verdict:** **A well-maintained 2012-2013 G37x AWD is a strong choice for a comfortable, reliable luxury sedan with AWD advantages but buyers must be diligent about transmission care.**

Details:

Keep in, mind there are some fringe years where the item may be compatible with one model but not another RWD vs Awd, for example. Model: G37x AWD. Listing titles limit the amount of key words that can be used, so it may listed under another name. Make: Infiniti.

Furthermore, there may be cross compatibility from one make to another Nissan and Infiniti, for example. Shipping costs are not negotiable, in most cases. Residential/commercial address, lift gate access, etc. If you are unsure.

Transmission: 7AT. Be sure to select an accurate reason when opening a case.

part #: 31020x628e prices

• $449.00-$1259.30

specifications autotransmissionsgo:

• for models: Awd
• for makes: Infiniti
• for years: 2012-2013
• mpn: 31020-x628e
• type: Automatic Transmission
• universal fitment: No
• country of origin: Japan

offer autotransmissionsgo:

• started: April 24, 2026
• availability: In Stock
• options: Ship-to-home
• best offers: True
• sold: 0
• quantity: 1

shipping autotransmissionsgo:

• class: Standard
• type: Fixed
• transit: 4-8 Days
• cost: $450.00
• carrier: UPS
• service: UPS Ground

returns autotransmissionsgo:

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

general autotransmissionsgo:

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

seller autotransmissionsgo:

• # reviews: 3123
• rating: 99.8%
• city: Tucson, Arizona

payments autotransmissionsgo:

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

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