SONNAX 34672-01 Performance Shaft Up 4L80E 4L85E TH400 1000HP

( Brand: Sonnax ), ( Manufacturer Part Number: 34672-01 ), ( Non-domestic Product: No ), ( Fitment Type: Direct Replacement ), ( Items Included: Heavy Duty 300m Input Shaft ), ( Transmission Type: Automatic ), ( California Prop 65 Warning: Warning ), ( Type: Input Shaft ), ( Manufacturer Warranty: Unspecified Length ), ( Universal Fitment: Yes )

Review SONNAX Performance Main Shaft Heavy Duty Up To 1000hp fits 300M

The Sonnax Performance Shaft Kit (Part Number: 34672-01) is an essential upgrade for vehicles equipped with 4L80E, 4L85E, or TH400 transmissions, capable of handling power outputs up to 1,000 horsepower. This high-performance component is designed to enhance the durability and strength of your transmission, ensuring optimal performance and reliability.

This Sonnax shaft kit is specifically engineered for heavy-duty and high-performance applications. The key feature of this product is the use of 300M alloy steel for the shafts, which provides increased strength and rigidity compared to the standard OE material. This material upgrade is crucial for transmissions that experience high torque and horsepower levels.

The Sonnax 34672-01 kit includes several shafts that are critical to the transmission's functionality. These include the input shaft, countershaft, output shaft, and the reverse idler shaft. Each shaft is precision-manufactured to ensure a perfect fit and superior strength. Additionally, the kit includes new seals and bearings, ensuring a proper seal and minimizing the possibility of leaks.

The Sonnax 34672-01 Performance Shaft Kit offers numerous benefits for enthusiasts and professionals alike. It provides improved strength and durability, enabling the transmission to handle increased power levels without failure. This not only results in better performance but also extends the life of the transmission, saving you from costly repairs or replacements.

The Sonnax 34672-01 Performance Shaft Kit is an excellent investment for anyone looking to maximize the potential of their high-performance vehicle or heavy-duty equipment. By upgrading your transmission with this superior-quality component, you can confidently push your vehicle to new limits while ensuring its longevity.

Pros and Cons of Buying Sonnax 34672-01 Performance Shaft for 4L80E, 4L85E, and TH400 Transmissions (Up to 1000hp)

The Sonnax 34672-01 Performance Shaft is a popular upgrade for high-performance applications of 4L80E, 4L85E, and TH400 transmissions, capable of handling up to 1000 horsepower. This article aims to provide an unbiased analysis of the product, including its advantages and disadvantages, leading to a conclusion and recommendation.

1. Enhanced Durability: The Sonnax 34672-01 Performance Shaft is designed with high-strength steel, which ensures increased durability and resistance to failure under high horsepower and torque loads.

2. Improved Power Transfer: The shaft's larger diameter and increased strength result in more efficient power transfer between the transmission and the differential, leading to improved acceleration and overall performance.

3. Compatibility: The Sonnax 34672-01 Performance Shaft is compatible with various transmission types and applications, including 4L80E, 4L85E, and TH400, making it a versatile option for car enthusiasts and builders.

4. Upgrade Path: The shaft serves as a stepping stone for further performance upgrades, such as installing aftermarket clutches or converters, as it can handle the increased loads that come with these modifications.

1. Cost: The Sonnax 34672-01 Performance Shaft is a premium upgrade, and its price tag might be a significant investment for some enthusiasts, especially those on a tight budget.

2. Installation Complexity: Installing the Sonnax 34672-01 Performance Shaft requires some level of expertise and experience in transmission rebuilding and installation, which might be a challenge for some DIYers.

3. Potential Clearance Issues: Depending on the application and the available space within the transmission case, there might be clearance concerns when installing the shaft, which could require additional modifications.

The Sonnax 34672-01 Performance Shaft is an excellent investment for those seeking improved durability, power transfer, and overall performance in their high-horsepower 4L80E, 4L85E, and TH400 transmissions. Despite its cost and installation complexity, the benefits outweigh the drawbacks for performance enthusiasts and builders.

If you are planning a high-performance build with a 4L80E, 4L85E, or TH400 transmission and expect to exceed stock horsepower levels, the Sonnax 34672-01 Performance Shaft is a must-have upgrade. Its durability, efficiency, and compatibility make it an essential component for any serious performance project. However, it is crucial to ensure that you have the necessary expertise, tools, and resources to install the shaft correctly to reap its full benefits.

Details:

Never has been used in a vehicle The Sonnax Performance 4L80E 4L85E TH400 Main Shaft is heavy-duty, 300M input shaft designed for automatic transmissions. The new surface finish and universal fitment make it a versatile option for various vehicle model's racing applications. It is a direct replacement part suitable for up to 1000HP vehicles, ensuring durability and reliability high-performance applications. Was installed into a transmission for Dino/bench testing only.

part #: 3467201 prices

• $438.70-$1342.40

specifications gearreb:

• brand: Sonnax
• mpn: 34672-01
• non-domestic product: No
• fitment type: Direct Replacement
• items included: Heavy Duty 300m Input Shaft
• transmission type: Automatic
• california prop 65 warning: Warning
• type: Input Shaft
• manufacturer warranty: Unspecified Length
• universal fitment: Yes

seller gearreb:

• # reviews: 8
• city: Hays, Kansas
• rating: 100.0%

general gearreb:

• condition: New other see details
• Car Truck Parts Accessories > Transmission Drivetrain > Transmission Rebuild Kits

payments gearreb:

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

offer gearreb:

• best offers: True
• sold: 0
• quantity: 1
• started: November 23, 2025
• availability: In Stock
• options: Ship-to-home

shipping gearreb:

• type: Calculated
• cost: $30.94
• transit: 5-11 Days
• carrier: USPS
• service: USPS Priority Mail
• class: Expedited

returns gearreb:

• policy: No Returns

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