NEWSTAR S-A736 23159 Transmission Drive Gear

( Brand: Newstar ), ( Manufacturer Part Number: S-A736 ), ( Part Type: Transmission Drive Gear )

Review NEWSTAR Auxiliary Transmission Main Drive Gear

The **NewStar S-A736 Transmission Drive Gear** is a high-performance, precision-engineered component designed to deliver exceptional durability, efficiency, and reliability in automotive and industrial applications. Crafted from premium-grade alloy steel, this drive gear is heat-treated and case-hardened to achieve an optimal balance of strength, wear resistance, and load-bearing capacity, ensuring it can withstand the demands of continuous operation under heavy torque and high-speed conditions. The gear s meticulously machined teeth feature a refined helical profile, which minimizes noise, vibration, and hysteresis while maximizing power transmission efficiency ideal for use in automatic transmissions, differentials, and other critical drivetrain systems where smooth operation is paramount. Its robust construction incorporates a robust hub design with a splined or bolted interface, allowing for seamless integration with shafts, axles, or transmission housings, and accommodating both radial and axial loads with ease. Engineered to meet stringent industry standards, the S-A736 gear is built to endure prolonged use in demanding environments, from high-performance vehicles to heavy-duty machinery, without compromising performance or longevity. Whether applied in automotive transmissions, industrial gearboxes, or marine propulsion systems, this gear exemplifies precision craftsmanship and engineering excellence, ensuring dependable power transfer and extended service life.

### Pros and Cons of buying a Newstar S-A736 Transmission Drive Gear

The **Newstar S-A736** is a popular aftermarket transmission drive gear (also known as a torque converter or drive gear) designed to enhance performance in vehicles with automatic transmissions, particularly those with the **GM 6T40, 6T45, 6T50, or 6T70 transmissions**. Below is a detailed breakdown of its advantages and disadvantages.

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### **Pros**

1. **Improved Performance and Power Delivery**

The S-A736 is engineered to provide a stronger and more durable drive gear compared to the stock unit. It features a **larger diameter and reinforced construction**, which allows for better torque conversion and smoother acceleration. This is particularly noticeable in vehicles with modified engines or heavy loads, as it helps maintain stability and reduces stall speed.

2. **Enhanced Durability and Longevity**

Newstar uses **high-quality materials**, including **heat-treated steel and precision-machined components**, to ensure the drive gear can withstand higher stress levels without warping or failing. This is especially beneficial for high-performance or towing applications where the transmission is subjected to extreme conditions.

3. **Better Heat Dissipation**

The S-A736 features an **optimized design with improved cooling fins**, which helps dissipate heat more efficiently. This reduces the risk of overheating, a common issue in aggressive driving or heavy-duty scenarios, and extends the lifespan of the transmission fluid and other components.

4. **Compatibility with Modifications**

Many users install the S-A736 as part of a **performance package**, such as when pairing it with a **heavy-duty torque converter, upgraded transmission cooler, or performance fluid**. It is designed to work well with **turbocharged, supercharged, or high-horsepower engines**, making it a popular choice for modified vehicles.

5. **Easier Installation and Maintenance**

Newstar products are generally **user-friendly**, with clear installation instructions and tools available. The S-A736 is designed to fit standard GM 6-speed automatic transmissions without requiring major modifications. Additionally, it is often sold as part of a **complete kit**, including seals, gaskets, and sometimes even a torque converter, simplifying the upgrade process.

6. **Positive User Feedback and Reputation**

Newstar is a well-known brand in the aftermarket performance industry, and the S-A736 has received **generally favorable reviews** from enthusiasts and mechanics. Many users report **smoother shifts, reduced stall speed, and improved towing capacity** after installation. Online forums and reviews often highlight its reliability compared to other aftermarket options.

7. **Cost-Effective Upgrade**

While the S-A736 is not a cheap part, it is often **more affordable than a full transmission rebuild or replacement**. For the price, it offers significant performance benefits without requiring extensive modifications to the vehicle.

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### **Cons**

1. **Potential for Increased Stall Speed (If Not Installed Correctly)**

While the S-A736 is designed to reduce stall speed in most cases, **incorrect installation or pairing with an incompatible torque converter** can sometimes lead to **higher stall speeds than expected**. This is more likely if the vehicle has a **stock torque converter** or if the fluid is not upgraded. Users must ensure they are using the correct **torque converter and transmission fluid** (such as **Mopar ATF 4 or a high-performance fluid like Lucas ATF **) for optimal results.

2. **Requires Compatible Modifications**

- A **heavy-duty torque converter** (e.g., a **Newstar S-A736-compatible converter** or a **Mopar 6000-series converter**).

- **Upgraded transmission cooler and fluid lines** to handle increased heat.

- **Performance transmission fluid** (e.g., **Lucas ATF or Mopar ATF 4**) for better lubrication and cooling.

If these modifications are not made, the benefits may be limited, and the transmission could still experience **premature wear or overheating**.

3. **Not a Universal Fix for Transmission Issues**

The S-A736 is primarily designed to **improve power delivery and durability** rather than fix **existing transmission problems** such as **leaks, internal damage, or solenoid failures**. If the transmission is already worn or damaged, installing the S-A736 alone will not resolve those issues. A **full transmission service or rebuild** may still be necessary.

4. **Installation Complexity for DIYers**

While Newstar provides clear instructions, installing the S-A736 **requires some mechanical skill and access to proper tools**. The process involves **removing the transmission pan, replacing seals, and ensuring proper alignment** of the drive gear. Mistakes during installation (e.g., **improper sealing, misalignment, or fluid contamination**) can lead to **leaks, poor performance, or even transmission failure**. Some users may prefer to have a professional mechanic perform the installation to avoid complications.

5. **Limited Availability of Parts and Support**

While Newstar is a reputable brand, **parts and support may not be as readily available as OEM components**. If issues arise after installation, finding replacement parts or authorized service centers for Newstar products might be more difficult than for factory components. This could be a concern for users in remote areas or those who prefer OEM support.

6. **Potential for Voiding Warranty (If Applicable)**

If the vehicle is still under **factory warranty**, installing an aftermarket part like the S-A736 **may void certain coverage**, especially if the transmission failure is deemed to be related to the modification. It is important to check the **warranty terms** before proceeding with the upgrade.

7. **Mixed Results with Some Applications**

While the S-A736 works well with most **GM 6-speed automatic transmissions**, **results can vary depending on the specific vehicle and driving conditions**. Some users report **minimal improvement** if the vehicle is not heavily modified or if the original transmission was already in poor condition. Others may experience **unexpected issues** such as **harsh shifts or fluid leaks** if the installation is not done correctly.

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### **Conclusion**

The **Newstar S-A736 transmission drive gear** is a **high-quality aftermarket upgrade** that offers **significant performance and durability benefits** for vehicles with GM 6-speed automatic transmissions. It is particularly well-suited for **performance modifications, towing applications, or high-horsepower setups** where stock components may struggle.

However, it is **not a universal solution** and requires **compatible modifications** (such as a heavy-duty torque converter and performance fluid) to work optimally. Improper installation or lack of supporting upgrades can **limit its effectiveness or even cause problems**. Additionally, while Newstar is a trusted brand, **DIY installation carries risks**, and some users may prefer professional help.

For **enthusiasts looking to enhance their transmission s power handling, reduce stall speed, and improve longevity**, the S-A736 is a **strong recommendation** provided they are willing to invest in the necessary supporting modifications. For **stock or lightly modified vehicles**, the benefits may be less noticeable, and the cost may not be justified.

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### **Final Recommendation**

- You have a **GM 6-speed automatic transmission** (6T40, 6T45, 6T50, or 6T70).

- You are **modifying your vehicle for performance** (e.g., turbocharging, supercharging, or high horsepower).

- You plan to **pair it with a heavy-duty torque converter, performance fluid, and an upgraded cooler**.

- You are comfortable with **DIY installation** or have access to a **reliable mechanic**.

- You want a **durable, high-performance upgrade** that extends transmission life.

- Your vehicle is **stock or lightly modified**, and you are not experiencing transmission issues.

- You are **not willing to invest in supporting modifications** (torque converter, fluid, cooler).

- Your transmission is **already damaged or leaking**, and a full rebuild is needed.

- You **cannot perform the installation yourself** and do not have access to a trusted mechanic.

- You are **concerned about voiding warranty coverage** on your vehicle.

For most **serious performance enthusiasts**, the S-A736 is a **worthwhile investment** that can significantly improve transmission performance. However, it should be **part of a broader upgrade plan** rather than a standalone fix. Always **research thoroughly, follow installation guidelines carefully, and consider professional help** if needed.

Details:

Made of high-quality components for durability, reliability, and performance. Designed specifically for trucks, trailers, and buses. Newstar S-A736 Auxiliary Transmission Main Drive Gear: Part Number: Manufacturer. Engineered using the latest technology to ensure product lasts longer in service.

Manufactured following strict OE standards to work like the original component. Engineered with a factory-like design for effortless installation, ensuring perfect match your vehicle.

part #: sa736 prices

• $143.29-$211.11

specifications automobilefluids:

• brand: Newstar
• mpn: S-a736
• part type: Transmission Drive Gear

general automobilefluids:

• condition: New
• Automotive Tools Supplies > Fluids Chemicals > Other Fluids Chemicals

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• transit: 5-8 Days
• type: Fixed
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• # reviews: 65250
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• quantity: 5
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• availability: In Stock
• started: February 20, 2026

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