SUPERIOR STL010 Wit Whatever Takes Transmission Sure 313033377309 6L80 6L90 8L90

( Brand: Superior ), ( Manufacturer Part Number: STL010 ), ( Item Weight: 3.87 Ounces ), ( Product Dimensions: 4 X 4 X 1 Inches ), ( UPC: 313033377309 )

Review SUPERIOR Wit Whatever It Takes Transmission Parts Inc Sure Cool

The **Superior STL010 WIT Transmission Fluid** is a high-performance, full-synthetic transmission fluid engineered specifically to deliver exceptional protection, longevity, and peak performance across a broad spectrum of modern automatic transmissions, including those equipped with the legendary **6L80, 6L90, and 8L90** torque converters and valve bodies. Designed to meet and exceed the rigorous demands of heavy-duty applications, this fluid combines cutting-edge synthetic chemistry with superior thermal stability to ensure smooth shifting, reduced wear, and enhanced durability in both high-performance and commercial vehicles. Its advanced friction modifier technology provides precise clutch engagement, minimizing jerking and harsh shifts while maintaining optimal torque converter slip, which is critical for maximizing power transfer in high-torque applications. The fluid s superior oxidation resistance helps prevent sludge formation and varnish buildup, ensuring clean internal components and prolonging the life of seals, bearings, and hydraulic systems. Additionally, its excellent cold-weather flow properties guarantee reliable performance in extreme temperatures, from sub-zero starts to scorching highway driving, making it an ideal choice for fleets, towing vehicles, and performance-oriented trucks. Whether used in heavy-duty diesel trucks, muscle cars, or high-mileage workhorses, the **Superior STL010 WIT** stands as a premium alternative to conventional fluids, offering superior protection against wear, foaming, and thermal breakdown while adhering to the strict specifications of modern transmission designs. Built to last, this fluid ensures that transmissions remain in peak condition, reducing the risk of costly repairs and downtime while delivering the smooth, responsive operation drivers demand.

### **Pros and Cons of Buying a Superior STL010 with a 6L80/6L90/8L90 Transmission**

#### **Pros**

1. **Versatility and Compatibility**

The STL010 chassis is a popular choice among off-road and performance enthusiasts due to its modularity. It can be adapted for various applications, including overlanding, racing, and heavy-duty towing. The 6L80, 6L90, and 8L90 transmissions are all robust, high-performance options that work well with the STL010 s power delivery, especially when paired with a strong engine like the LS-based powertrains commonly used in this build.

2. **Strong Aftermarket Support**

The STL010 benefits from a thriving aftermarket community, with readily available parts for suspension, drivetrain, and body modifications. The 6L80/6L90/8L90 transmissions are also well-supported, with aftermarket upgrades (such as clutch kits, torque converters, and transmission coolers) available to enhance performance and durability.

3. **High Torque Handling**

The 6L90 and 8L90 transmissions are designed to handle high torque loads, making them ideal for heavy-duty applications like towing or off-roading. The 6L80, while slightly less torque-capable, is still a reliable choice for performance builds. All three transmissions offer strong shifting capabilities, which is crucial for a chassis like the STL010 that may be modified for aggressive driving.

4. **Fuel Efficiency and Practicality**

The STL010 is often built with fuel efficiency in mind, especially when paired with a smaller engine (e.g., LS3 or LS7) and an efficient transmission like the 6L80. The 6L90 and 8L90, while more torque-focused, still offer decent fuel economy for their class, making them practical for long-distance travel or daily driving when properly tuned.

5. **Resale Value and Community Appeal**

The STL010 chassis holds its value well within the aftermarket community, particularly among those who appreciate custom builds. A well-built STL010 with a reliable transmission (like the 6L90 or 8L90) can attract buyers looking for a pre-built, high-performance vehicle. The 6L80 is slightly less expensive but may not appeal to those seeking maximum torque.

6. **Durability and Longevity**

All three transmissions (6L80, 6L90, 8L90) are built to last with proper maintenance. The 6L90 and 8L90, in particular, are known for their robustness in demanding applications. When paired with a strong engine and proper cooling, they can easily exceed 100,000 miles with minimal issues.

7. **Customization Options**

The STL010 s open chassis design allows for extensive customization, including alternative drivetrain setups (e.g., rear-wheel drive, four-wheel drive, or even experimental layouts). The transmission choice can be tailored to the specific needs of the build, whether prioritizing performance, towing, or off-road capability.

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#### **Cons**

1. **Cost of Upgrades**

While the STL010 chassis itself is relatively affordable, the cost of upgrading to a 6L90 or 8L90 transmission (or even a properly tuned 6L80) can be significant. These transmissions require high-quality fluids, cooling systems, and sometimes custom torque converters or clutch kits, all of which add to the expense. The 6L90 and 8L90, in particular, are more expensive than the 6L80 upfront.

2. **Complexity of Installation**

Installing a transmission in an STL010 build especially a 6L90 or 8L90 can be labor-intensive. These transmissions are larger and heavier than the stock 6L80, requiring careful alignment with the engine, driveshafts, and differential. Poor installation can lead to drivetrain issues, so professional help may be necessary, increasing costs.

3. **Maintenance Requirements**

The 6L90 and 8L90 transmissions demand more frequent maintenance than the 6L80. They require regular fluid changes (every 30,000 50,000 miles), cooler maintenance, and sometimes clutch or torque converter servicing. Neglecting maintenance can lead to premature wear, especially in high-torque applications.

4. **Potential for Overkill**

If the STL010 build is not heavily modified for towing or extreme off-roading, a 6L90 or 8L90 transmission may be overkill. The 6L80 is sufficient for most performance and daily-driving applications and is less expensive to maintain. Opting for a more capable transmission without a clear need can lead to unnecessary costs.

5. **Weight and Space Considerations**

The 6L90 and 8L90 transmissions are significantly heavier than the 6L80, which can affect the STL010 s handling and fuel efficiency. Additionally, their larger size may require modifications to the chassis or drivetrain to ensure proper fitment, especially in tight or custom builds.

6. **Learning Curve for Tuning**

The 6L90 and 8L90 transmissions, particularly in high-torque applications, require careful tuning to prevent damage. Improper programming (e.g., aggressive shifting or clutch engagement) can lead to transmission failure. This may necessitate the use of a tuner or ECU programmer, adding another layer of complexity and cost.

7. **Potential for Reliability Issues**

While all three transmissions are durable, they are not immune to failure, especially in extreme conditions. The 6L90 and 8L90, in particular, can develop issues with the torque converter or clutch over time if not properly maintained. The 6L80, while simpler, can also fail if subjected to excessive stress without proper cooling or fluid.

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### **Conclusion and Recommendation**

The **Superior STL010 chassis** is an excellent platform for custom builds, and the choice of transmission depends largely on the intended use of the vehicle. Here s a breakdown of the best options based on different priorities:

The **6L80** is the most practical choice. It offers a good balance of performance, fuel efficiency, and cost. It s well-suited for builds with engines like the LS3 or LS7, providing smooth shifting and adequate torque for most applications. The 6L80 is easier to maintain and less expensive than the 6L90 or 8L90, making it ideal for enthusiasts who want a high-performance vehicle without the added complexity.

The **6L90** is the best choice. It s designed to handle high torque loads, making it ideal for towing trailers, hauling heavy loads, or off-roading in demanding conditions. The 6L90 strikes a balance between torque capacity and manageable maintenance requirements. It s more expensive than the 6L80 but offers significantly better durability for heavy use.

The **8L90** is the most capable transmission in this lineup. It s built for extreme torque applications and is commonly used in high-performance or off-road builds where maximum durability is required. However, it comes with higher upfront costs, increased maintenance needs, and a steeper learning curve for tuning. If the STL010 build is intended for extreme off-roading or heavy towing, the 8L90 is justified. Otherwise, the 6L90 may be sufficient.

If the primary goal is to build a high-performance vehicle without the added expense of a 6L90 or 8L90, the **6L80 remains the best value**. It s widely available, easier to work with, and still capable of handling significant power when properly supported with cooling and clutch upgrades.

### **Final Recommendation**

For the **average STL010 build** whether for performance driving, overlanding, or light towing the **6L80 is the most practical and cost-effective choice**. It offers a strong performance profile, good fuel efficiency, and lower maintenance costs compared to the 6L90 or 8L90. If the build is intended for **heavy towing or extreme off-roading**, the **6L90 is the better investment**, as it provides the necessary torque capacity without the added complexity of the 8L90. The **8L90 should only be considered** for builds where maximum durability and torque handling are critical, and the budget allows for the higher upfront and maintenance costs.

Ultimately, the best transmission choice depends on the specific goals of the build. Prioritize the transmission s compatibility with your engine, the intended use of the vehicle, and your willingness to invest in maintenance and tuning. A well-matched transmission will ensure a smooth, reliable, and enjoyable driving experience.

Details:

Reduced risk of overheat while under load, Increased ATF life. Superior STL010: Fits all 2014 up 6L80/90E AND NOW FITS 8L80/90E 2016 -up: Superiors Cooler Flow bypass valve kit with Trans Labs patented and patent pending Control cooler technologies allows full time flow lube to parts so you re not hot under the collar SURE COOL. Whatever It Takes Transmissions products are engineered to meet or exceed OEM specifications and manufactured using high quality components. Built in safety bypass Immediate cooler fill.

Immediate accurate fluid level check without warm-up cycle. Reduced average operating temperatures by as much 20%.

part #: stl010 prices

• $23.99-$49.50

specifications tvmountbracketgo:

• brand: Superior
• mpn: Stl010
• item weight: 3.87 Ounces
• product dimensions: 4 X 4 X 1 Inches
• upc: 313033377309

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• condition: New
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