EATON FULLER 22079 Gear Countershaft 4TH FS4005A FS4005B

( Brand: Eaton Fuller ), ( Manufacturer Part Number: 22079 ), ( Part Type: Gear )

Review EATON FULLER Oem 4th Gear Countershaft

The Eaton Fuller 22079 4th Gear Countershaft Kit is a crucial component for heavy-duty transmission systems, specifically designed for use with Eaton Fuller Roadranger Gearboxes. This particular kit includes two essential parts - the 4th gear countershaft (FS4005A) and the 4th gear countershaft nut set (FS4005B).

The 4th gear countershaft (FS4005A) is a robust and precisely engineered component. It is manufactured from high-strength steel, ensuring it can withstand the immense torque and power transmission requirements of heavy-duty vehicles. The shaft features a polished finish to minimize friction and wear, while its precision machining guarantees a perfect fit within the transmission system.

The FS4005A countershaft measures approximately 3.175 inches in length and 1.187 inches in width, with a central bore of 0.875 inches. It is designed for use with a 1.000 inch spline and is compatible with various Eaton Fuller Roadranger gearboxes, including those used in commercial trucks, buses, and other heavy-duty applications.

The FS4005B nut set consists of a series of specially designed nuts, which securely fasten the 4th gear countershaft to the transmission system. These nuts are manufactured from high-strength material and are engineered to provide a secure and reliable connection. The set includes the necessary number of nuts for a complete installation, ensuring a proper fit and optimal performance.

These components are essential for maintaining the smooth and efficient operation of the Eaton Fuller Roadranger transmission system. Regular replacement of worn or damaged countershafts and nuts is vital to ensure the longevity and reliability of the transmission system in heavy-duty vehicles.

The Eaton Fuller 22079 4th Gear Countershaft Kit is a high-quality, reliable, and durable solution for those in need of replacement parts for their heavy-duty transmission systems. With its precise engineering, robust materials, and excellent fit, this kit offers the perfect combination of durability, reliability, and performance for heavy-duty applications.

The Eaton Fuller 22079 4th gear countershaft kit (consisting of partsFS4005A andFS4005B) is a commonly used replacement gear assembly in heavy-duty applications, particularly for Volvo and Mack trucks. Here are some pros and cons to consider before making a purchase.

1. High-quality components: Eaton Fuller is a well-known and reputable brand in the heavy-duty transmission industry. This kit is made of high-quality materials and is specifically designed for heavy-duty applications.

2. Improved performance: A new countershaft kit can help improve the overall performance of your transmission. Worn gears can cause shifting issues, noise, and vibration, which can be addressed with a replacement kit.

3. Increased durability: The new gears in this kit are designed to last longer than the original equipment, which can help reduce the need for future repairs.

4. OEM compatibility: This kit is designed to be a direct replacement for the original equipment, which can make installation easier and more straightforward.

1. Cost: Replacing a countershaft kit can be a significant investment, especially for older trucks. The cost of this kit may be more than some people are willing to pay.

2. Labor costs: Installing a countershaft kit can be a complex and time-consuming process, which can add to the overall cost of the repair.

3. Availability: Depending on the specific application, it may be difficult to find this exact kit. It's important to make sure that you order the correct part number to ensure compatibility.

In conclusion, the Eaton Fuller 22079 4th gear countershaft kit (FS4005A andFS4005B) can offer improved performance, increased durability, and OEM compatibility. However, the cost and labor involved in the installation process may be a disadvantage for some.

If you own a heavy-duty truck that requires a countershaft kit replacement and you value the benefits of high-quality components and improved performance, then this kit may be a worthwhile investment. However, if cost is a major concern, it may be worth exploring alternative options or considering a used or remanufactured part. Ultimately, the decision to purchase this kit depends on your specific needs, budget, and priorities.

Details:

See pictures for condition. Eaton Fuller OEM 22079 4th Gear Countershaft FS4005A FS4005B.

part #: 22079 prices

• $229.99-$2495.00

specifications manutransmission:

• brand: Eaton Fuller
• mpn: 22079
• part type: Gear

offer manutransmission:

• availability: In Stock
• options: Ship-to-home
• best offers: True
• quantity: 2
• started: August 30, 2025
• sold: 0

returns manutransmission:

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

seller manutransmission:

• rating: 99.9%
• city: Overland Park, Kansas
• # reviews: 1938

general manutransmission:

• condition: New
• Car Truck Parts Accessories > Transmission Drivetrain > Manual Transmission Parts

payments manutransmission:

• credit card: Diners-club
• other
• wallet: Apple-pay

shipping manutransmission:

• type: Fixed
• service: USPS Ground Advantage
• cost: $12.50
• transit: 5-10 Days
• class: Standard
• carrier: USPS

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