SUBARU Transmission Usdm A/t 72K 31000AJ510-TR690GB9BA 8751

( Manufacturer Part Number: 31000AJ510 ), ( Items Included: Internal Harness, Torque Converter ), ( Transmission Speeds: Continuously Variable ), ( Vintage Part: No ), ( Type: Automatic Transmission ), ( Country Of Origin: Japan )

Review SUBARU A/t Transmission Usdm 72k fits WRX CVT 2015–2017

The **Subaru 31000AJ510 (2015 2017 WRX with CVT Automatic Transmission, USDM)** is a meticulously engineered transmission module designed for the high-performance Subaru WRX models, offering seamless integration with the 2.5L FA25 turbocharged engine. This transmission, identified by its unique part number **31000AJ510-TR690GB9BA (8751)**, is a refined iteration of Subaru s continuously variable transmission (CVT) system, tailored to deliver smooth, responsive power delivery while maintaining the WRX s signature driving dynamics. The CVT s variable pulley system eliminates the need for traditional gears, allowing for an infinitely adjustable ratio that optimizes acceleration and fuel efficiency across a wide range of speeds. This design is particularly advantageous for the WRX s turbocharged setup, where quick throttle responses and precise torque management are critical for both spirited driving and daily commuting.

Built to Subaru s stringent quality standards, the **31000AJ510** features a robust construction with reinforced components to withstand the demands of aggressive driving, including the WRX s turbocharged power delivery and the occasional demands of track use. The transmission incorporates a sophisticated electronic control system that continuously adjusts the belt tension and pulley ratios in real-time, ensuring optimal performance whether cruising on the highway or navigating tight corners. The automatic transmission is paired with a torque converter, which enhances smoothness during gear transitions, reducing the jolts often associated with traditional automatic transmissions. This makes the **31000AJ510** an ideal choice for WRX owners seeking the convenience of an automatic without sacrificing the vehicle s sporty character.

Compatibility with the **2015 2017 WRX models** (including the STI variants with minor modifications) is seamless, as this transmission is factory-matched to the FA25 engine s power output and tuning requirements. The **TR690GB9BA (8751)** designation indicates a specific revision level, often incorporating updates to the transmission control software and hardware to address common wear points or improve durability. This transmission is particularly well-suited for enthusiasts who appreciate the WRX s manual transmission heritage but require the practicality of an automatic for daily use. Whether navigating city traffic, highway merges, or spirited drives on winding roads, the **31000AJ510** ensures a balanced blend of performance and comfort, making it a reliable upgrade or replacement for those seeking to maintain the WRX s performance integrity while enjoying the ease of an automatic transmission.

### **Pros and Cons of Buying a 2015-2017 Subaru WRX (31000AJ510) with CVT Transmission (USDM)**

1. **Performance and Driving Dynamics**

- The 2015-2017 WRX (FA) is a well-regarded hot hatch with a naturally aspirated 2.5L EJ257 engine producing around **268-276 hp** and **186 lb-ft of torque**, making it quick and engaging for its class.

- The **AWD system** provides excellent traction in various conditions, including snow and light off-road scenarios.

- The **stiff chassis** and **sport-tuned suspension** (especially with aftermarket upgrades) offer sharp handling and a fun driving experience.

2. **Reliability (Compared to Other Models)**

- The **EJ257 engine** is known for being more durable than some of its competitors (e.g., Ford Focus ST s EcoBoost or Honda Civic Type R s K20Z3).

- With proper maintenance (oil changes, timing belt replacement at the manufacturer s interval), the engine can last **150,000 miles** without major issues.

- The **CVT transmission** (while polarizing) is less prone to failure in this application compared to earlier CVTs (e.g., 2013-2014 models). Subaru improved reliability in the **TR690** unit, though it still requires careful monitoring.

3. **Aftermarket Support**

- The WRX has a **strong aftermarket**, with widely available parts for tuning (e.g., **Turbocharged (2014 TC) or NA upgrades**), suspension upgrades, and interior modifications.

- **Forced induction (turbocharged) kits** (e.g., **Subaru 2716 turbo, Garrett GT2870**) are popular for those wanting more power.

- **Performance brakes, exhaust systems, and drivetrain upgrades** are readily available.

4. **Resale Value (Compared to Some Rivals)**

- While not as high as a **Mazda MX-5 Miata** or **Toyota GR86**, the WRX holds value better than some turbocharged hot hatches due to its **reputation for fun driving and AWD capability**.

- The **2017 model** (especially with the **TC variant**) is slightly more desirable than the **2015-2016 NA models**, but all years share similar strengths.

5. **AWD Practicality**

- Unlike FWD hot hatches, the WRX s **symmetrical AWD** makes it more capable in **snow, rain, or light off-roading**, which is a major selling point for some buyers.

- The **Symmetrical AWD system** is more engaging to drive than most FWD cars, offering better balance and feedback.

6. **Modest Running Costs (Compared to Turbocharged Models)**

- The **naturally aspirated engine** is less stressful on fuel and oil than a turbocharged WRX, meaning **lower maintenance costs** in the long run.

- **CVT reliability** has improved, but it still requires **proper fluid changes** (every **60,000 miles**) to avoid premature wear.

---

1. **CVT Transmission Controversy**

- The **CVT (Continuously Variable Transmission)** is **not as popular** as a traditional automatic or manual, and some buyers dislike its **lack of traditional gears**.

- **Reliability concerns** persist while the **TR690** (used in 2015-2017 models) is an improvement over earlier CVTs, it can still **fail prematurely** if not maintained properly.

- **Common issues** include **slippage, overheating, and failure around 100,000 miles** if fluids aren t changed regularly.

- **No manual option** if you prefer a stick shift, this WRX is not for you.

2. **Engine and Transmission Power Delivery**

- The **NA (naturally aspirated) engine** is **less powerful** than turbocharged rivals (e.g., **2014 WRX STI, Ford Focus ST, Honda Civic Type R**).

- The **CVT s torque converter** can make **low-end acceleration feel sluggish** compared to a traditional automatic or manual.

- **Turbocharged models (2014 )** are more desirable, but the **2015-2017 NA WRX** is still a capable but less extreme option.

3. **Interior Quality and Comfort**

- The **interior is functional but dated**, with **hard plastics, a basic infotainment system (no Apple CarPlay/Android Auto until 2017), and poor sound insulation**.

- **Rear seating is tight** not ideal for tall passengers or frequent backseat use.

- **Clutch quality** (if you ever get a manual) is **poor**, but since this is an AWD CVT, that s irrelevant.

4. **Fuel Economy Trade-offs**

- While the **NA WRX is more efficient than a turbocharged version**, it still **averages around 20-22 MPG combined**, which is **worse than a Civic Si or Mazda3i**.

- The **CVT s efficiency is decent**, but it doesn t match the **manual transmission s fuel economy** in a traditional hot hatch.

5. **Maintenance Costs Can Add Up**

- **Timing belt replacement** is **critical** (every **105,000 miles** for the EJ257) and **expensive** ( $1,000 ).

- **AWD systems require more frequent servicing** than FWD cars (differential fluid changes, etc.).

- **CVT fluid changes** must be done **strictly on schedule** to avoid costly repairs.

6. **Depreciation and Market Demand**

- The **WRX (especially NA models) has seen declining demand** compared to turbocharged rivals, leading to **lower resale values**.

- **2015-2016 models** are **less desirable** than **2017 TC WRXs**, making them harder to sell later.

- **Insurance costs** can be higher than a **Civic Si or Mazda3i** due to its performance reputation.

7. **Rust and Corrosion Risks**

- Subarus are **prone to rust**, especially in **snowy or humid climates**. A **thorough inspection** is **essential** before buying.

- **Wheel wells, rocker panels, and undercarriage** should be checked for **corrosion**.

8. **Limited Practicality**

- The **small trunk (11.7 cu. ft.)** is **less spacious** than rivals like the **Civic Si or Mazda3i**.

- **Noisy cabin** due to poor sound insulation, making long drives less comfortable.

---

### **Ending Conclusion**

The **2015-2017 Subaru WRX (31000AJ510, NA, CVT, AWD)** is a **fun, capable hot hatch** that excels in **driving dynamics and AWD traction**, but it comes with **significant trade-offs**, particularly around **transmission reliability, power delivery, and long-term costs**.

- **Best for:** Buyers who **prioritize fun driving, AWD capability, and aftermarket potential** over **fuel efficiency, comfort, or traditional transmission options**. It s ideal for **enthusiasts who enjoy tuning, track days, or light off-roading**.

- **Worst for:** Those who **prefer a manual transmission, want better fuel economy, or need a more practical daily driver**. It s also **not ideal** if you **dislike CVTs** or want a **more refined, high-revving engine** (like a turbocharged STI or Civic Type R).

If you **inspect the CVT thoroughly, maintain it properly, and accept its quirks**, the WRX can be a **great project car or track-focused daily driver**. However, if you re looking for **a more conventional, reliable, and efficient hot hatch**, alternatives like the **Mazda3i, Honda Civic Si, or Ford Focus ST** may be better choices.

---

### **Final Recommendation**

You **love AWD and fun driving dynamics**.

You **plan to maintain it well** (CVT fluid changes, timing belt on schedule).

You **intend to modify it** (turbo, suspension, exhaust) and enjoy the aftermarket scene.

You **don t mind a CVT** and are okay with **lower fuel economy** for the performance.

You **find a well-documented, rust-free example** with **service records**.

You **prefer a manual transmission** or **traditional automatic**.

Details:

It was tested prior to removal. It is clean and in good working condition. All pro Subaru. 2015 Subaru WRX CVT Limited.

part #: 31000aj510 prices

• $999.99-$1350.00

specifications autotransmissionsgo:

• for models: Wrx, Cvt
• for makes: Subaru
• for years: 2015-2017
• mpn: 31000aj510
• items included: Internal Harness, Torque Converter
• transmission speeds: Continuously Variable
• vintage part: No
• type: Automatic Transmission
• country of origin: Japan

offer autotransmissionsgo:

• sold: 0
• availability: In Stock
• quantity: 1
• started: June 11, 2026
• options: Ship-to-home

payments autotransmissionsgo:

• wallet: Paypal
• other
• credit card: Discover

shipping autotransmissionsgo:

• class: Freight
• type: Fixed
• cost: $299.99
• service: Flat Rate Freight

general autotransmissionsgo:

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

returns autotransmissionsgo:

• policy: No Returns

seller autotransmissionsgo:

• rating: 100.0%
• city: Alpharetta, Georgia
• # reviews: 2707

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