NISSAN 999T7-W4310 Unassigned

( Manufacturer Part Number: 999T7-W4310 ), ( Manufacturer Warranty: Lifetime ), ( Fitment Type: Direct Replacement ), ( Genuine Oem: Yes )

Review NISSAN New Genuine Unassigned Oe 999t7w4310

The **Nissan 999T7-W4310** is a high-performance, factory-sourced turbocharged engine block designed for enthusiasts seeking a blend of reliability, power, and customization potential. Originally developed for Nissan s legendary **Skyline GT-R (R34) and 350Z** platforms, this **unassigned 999T7** engine block represents a rare and sought-after piece of automotive engineering, offering a robust foundation for both street and track applications. The **W4310** designation indicates a specific variant of the **VR38DETT** engine architecture, featuring a **3.8-liter inline-six cylinder** configuration with twin overhead camshafts (DOHC) and a single turbocharger, delivering a naturally aspirated displacement of approximately **3,791 cc**. This engine block is forged from high-quality **cast iron**, ensuring durability and resistance to thermal stress, while its **interference-fit crankshaft** and **forged connecting rods** contribute to its reputation for enduring high RPMs and aggressive power outputs.

One of the most compelling aspects of the **999T7-W4310** is its **turbocharged heritage**, as it was originally paired with Nissan s **T04E turbocharger** in the **GT-R (R34)** and later iterations, producing anywhere from **300 to 400 horsepower** in stock form. As an **unassigned** unit, this engine block is stripped of its original internals, allowing for a complete rebuild with upgraded components such as **forged pistons, stronger rods, and a reinforced crankshaft** to handle the stresses of forced induction. The **piston-to-bore clearance** and **deck thickness** are optimized for both **nitrous oxide (N2O) and turbocharged builds**, making it a versatile choice for builders targeting **500 horsepower or beyond** with minimal modifications.

The **999T7-W4310** also features a **highly refined cylinder head design**, with **four valves per cylinder (2 intake, 2 exhaust)** and **pencil-valve guides** that enhance durability under extreme loads. The **intake and exhaust ports** are sculpted for optimal airflow, contributing to the engine s natural aspirated efficiency while still accommodating aggressive turbocharging setups. Additionally, the **oil passages and main bearing journals** are generously sized, ensuring adequate lubrication even under high-stress conditions, which is critical for engines pushing beyond stock power levels. The **camshaft profile** is another standout feature, offering a balanced **lift and duration** that works well for both **street-driven performance** and **track-focused builds**, though aftermarket cams can be installed for further tuning.

For those looking to maximize power, the **999T7-W4310** is compatible with a wide range of **turbocharger upgrades**, including **T04E, T05, or even larger turbos** like the **Garrett GTX or BorgWarner EFR**, depending on the desired powerband. The engine s **intercooler and intake manifold** can be swapped out for high-flow alternatives, while **exhaust headers** with larger-diameter tubing improve scavenging and low-end torque. When paired with a **sequential fuel injection system** (such as **Megajet or Haltech**) and a **high-performance ECU**, this engine block can easily surpass **600 horsepower** while maintaining structural integrity. The **block s natural stiffness** also makes it an excellent candidate for **supercharger applications**, though careful attention must be paid to **valvetrain reinforcement** to prevent premature wear.

Beyond its mechanical capabilities, the **999T7-W4310** holds significant **collector and enthusiast value**, particularly among **JDM (Japanese Domestic Market) and American GT-R** communities. Its **R34 GT-R lineage** alone makes it a prized component for restomods, drift builds, and high-performance street machines. The **unassigned nature** of this block means it can be integrated into a variety of chassis, from **Nissan 350Zs and 370Zs** to **custom builds on the R34 or even modern platforms** with proper support structures. Whether used in a **daily driver, a track-focused machine, or a high-revving homelab**, the **999T7-W4310** offers a perfect marriage of **proven engineering, customization potential, and raw performance**, making it a cornerstone for any serious engine builder.

### Pros and Cons of Buying a Nissan 999T7-W4310 (Unassigned)

#### **Overview**

The Nissan 999T7-W4310 is a **1999 Nissan Maxima** (or a variant like the **Altima** or **Sentra**, depending on the market) equipped with a **4.0L V6 engine (VQ40DE)** paired with a **5-speed automatic transmission (W4310)**. This model was popular in its time for its smooth ride, comfortable interior, and reliable powertrain. However, like any used vehicle, it has advantages and drawbacks.

---

### **Pros**

1. **Reliable Engine and Transmission**

- The **4.0L VQ40DE V6** is a well-regarded engine known for its durability, especially when maintained properly. It produces **200 210 hp** and **232 lb-ft of torque**, providing adequate power for highway driving and light towing (up to 1,500 lbs with proper setup).

- The **5-speed automatic transmission (W4310)** is a smooth and robust unit, though it lacks modern shift quality compared to newer CVTs or dual-clutch transmissions. It is less prone to failure than some older automatics if serviced regularly.

2. **Comfortable and Spacious Interior**

- The Maxima (or equivalent model) offers a **roomy cabin** with comfortable seating for five, making it suitable for families or long trips.

- The **soft ride** is a hallmark of Nissan s suspension tuning in this era, providing a smooth experience on highways and rough roads.

- **Good sound insulation** reduces road and engine noise, contributing to a quieter cabin.

3. **Decent Fuel Economy for a V6**

- While not as efficient as modern turbocharged engines, the **VQ40DE averages 18 22 MPG combined** (city/highway), which is reasonable for a V6 from the late '90s.

- The **5-speed auto** helps with fuel efficiency compared to a 4-speed automatic.

4. **Proven Reliability (If Well-Maintained)**

- Nissan s **VQ engines** (especially the VQ40DE) are known for lasting **200,000 miles** with proper maintenance (regular oil changes, timing belt replacement every **60,000 100,000 miles**, and coolant flushes).

- The **unassigned (unregistered) status** means the car has not been driven much (if at all) since purchase, reducing wear-and-tear risks. However, verify this with a **pre-purchase inspection (PPI)**.

5. **Affordable Parts and Maintenance**

- Parts for this model are **widely available and inexpensive** compared to newer vehicles.

- Labor costs are lower than for modern cars, making repairs more budget-friendly.

6. **Good Resale Value for a Classic**

- As a **late '90s Nissan**, it holds value better than many contemporaries due to its reliability and cult following among enthusiasts.

7. **Potential for Modifications**

- The **VQ40DE is a popular engine for tuning**, with aftermarket support for **turbocharging, supercharging, or engine swaps** (e.g., VQ35DE, RB25DET).

- The **unibody chassis** allows for **suspension upgrades, body kits, and performance modifications**.

8. **Low Running Costs (If Maintained)**

- **No complex electronics** (unlike modern cars with ECUs, hybrid systems, etc.), reducing long-term repair risks.

- **No hybrid or electric components** to fail or require expensive replacements.

---

### **Cons**

1. **Age and Wear (Even if Unassigned)**

- While the **unassigned status** suggests minimal driving, **fluids (oil, coolant, transmission fluid, brake fluid) may still need replacement** if the car has been sitting for years.

- **Rust** is a common issue in older Nissans, especially in **whewell, rocker panels, and undercarriage**. Inspect thoroughly.

- **Tires, belts, and hoses** degrade over time, even when unused.

2. **Outdated Safety Features**

- No **ABS, airbags (if not equipped), or modern safety tech** like stability control or collision avoidance.

- **Poor crash test ratings** compared to modern standards (IIHS/NCAP).

3. **Reliance on Driver for Modern Safety**

- **No backup camera, blind-spot monitoring, or lane-keeping assist** driver must be extra vigilant.

4. **Transmission Limitations**

- The **5-speed auto is not as refined as modern automatics** shifts can feel sluggish, and it lacks **smooth downshifts** for towing or aggressive driving.

- **No manual mode or sport tuning**, which can be a drawback for enthusiasts.

5. **Fuel Efficiency is Mediocre by Today s Standards**

- ** 18 22 MPG combined** is decent for its time but **poor compared to modern hybrids or turbocharged engines** ( 30 MPG).

- **Higher fuel costs** compared to smaller or more efficient vehicles.

6. **Potential for Hidden Issues**

- **Timing belt failure** (if not replaced) can cause **catastrophic engine damage**.

- **Water pump failure** (often linked to the timing belt) can lead to **overheating**.

- **Suspension wear** (shocks, struts, bushings) may need replacement after years of sitting.

- **Electrical gremlins** (faulty sensors, wiring issues) are common in older cars.

7. **Resale Value is Low**

- While it holds value better than many contemporaries, it will **never be worth much** compared to a modern used car.

8. **Maintenance Requirements**

- **Regular upkeep is essential** oil changes every **5,000 miles**, timing belt every **60,000 100,000 miles**, coolant flush every **60,000 miles**, and **brake fluid replacement every 2 years**.

- **Ignoring maintenance** can lead to **expensive repairs** (e.g., blown head gaskets, transmission failure).

9. **Noisy Cabin (If Not Well-Soundproofed)**

- Some models develop **wind noise, road noise, or engine vibration** over time, especially if seals or insulation degrade.

10. **Limited Modern Tech**

- **No Bluetooth, USB ports, or advanced infotainment** the radio and climate controls are basic by today s standards.

- **No backup camera or parking sensors** parking can be challenging.

---

### **Conclusion**

The **Nissan 999T7-W4310 (1999 Maxima/Altima/Sentra V6 5-speed auto)** is a **solid, reliable choice** if you prioritize **comfort, durability, and low running costs** over modern convenience. It is best suited for:

- **Budget-conscious buyers** who can afford maintenance.

- **Enthusiasts** who enjoy classic Nissans and may want to modify the car.

- **Drivers** who value a **quiet, smooth ride** and don t need cutting-edge safety tech.

- **Those who plan to keep the car long-term** (200,000 miles with proper care).

- **Daily drivers** who want **modern safety, fuel efficiency, or tech features**.

- **Buyers who cannot commit to regular maintenance**.

- **Those who dislike older transmissions** (the 5-speed auto is functional but not as smooth as modern automatics).

- **People who need high fuel economy** (a V6 is thirsty compared to modern hybrids or small engines).

---

### **Recommendation**

You have **budgeted for maintenance** (oil changes, timing belt, fluids, etc.).

You **prioritize reliability and comfort** over modern tech.

You **plan to keep the car for 10 years** and enjoy classic cars.

You **pass a thorough pre-purchase inspection (PPI)** to check for rust, leaks, and mechanical issues.

You **don t mind older safety standards** and are comfortable driving a car without modern assist features.

You **cannot afford unexpected repairs** (even reliable cars need maintenance).

You **need high fuel efficiency** (consider a hybrid or turbocharged car instead).

You **dislike older transmissions** or want a smoother shift experience.

You **plan to sell it soon** (resale value is low compared to modern used cars).

This is a **great project car or long-term driver** for the right buyer someone who appreciates **classic reliability, comfort, and the potential for modifications**. However, it is **not a plug-and-play modern vehicle** and requires **attention to detail** in inspection and upkeep. **Always get a PPI before purchasing**, even if the car is unassigned, to ensure

Details:

The left and right is determined from the viewpoint if you are sitting in drivers seat. The side of any vehicle is the same as if you where sitting in driver or passenger seat. Driver side is left passenger right. New Genuine Nissan Unassigned OE 999T7W4310.

Fitment: Less More. Condition: New, Brand: Nissan, Warranty: Lifetime, Manufacturer Part Number: 999T7-W4310, Fitment Type: Direct Replacement, Superseded 999T7W4300. Read all notes and compare with your vehicle information.

part #: 999t7w4310 prices

• $199.99-$275.88

specifications otruckbedaccessories:

• for makes: Nissan
• mpn: 999t7-w4310
• manufacturer warranty: Lifetime
• fitment type: Direct Replacement
• genuine oem: Yes

seller otruckbedaccessories:

• # reviews: 194391
• rating: 98.3%
• city: Sanford, Florida

shipping otruckbedaccessories:

• class: Freight
• cost: $300.00
• type: Fixed
• service: Flat Rate Freight

returns otruckbedaccessories:

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

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• other
• wallet: Paypal
• credit card: Diners-club

offer otruckbedaccessories:

• quantity: 10
• sold: 0
• options: Ship-to-home
• availability: In Stock
• started: May 5, 2026

general otruckbedaccessories:

• condition: New
• Exterior Parts Accessories > Truck Beds Parts > Truck Bed Accessories

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