C491 NATIONAL Transmission Shaft Seal C20 Chevrolet

Review NATIONAL 79-8 Transmission Input Shaft Seal For Chevrolet Pickup for CHEVROLET C20 1964–1968

Introducing the National C491 79-8 Transmission Shaft Seal, an essential component designed specifically for Chevrolet C20 vehicles manufactured between 1964 and 1968. This high-quality seal is engineered to provide a perfect fit and reliable performance, ensuring the smooth operation of your transmission system.

The National C491 79-8 Transmission Shaft Seal is meticulously crafted using advanced materials, ensuring durability and longevity. The seal features a robust design that effectively prevents transmission fluid from leaking out, while simultaneously keeping contaminants and debris from entering the transmission.

This seal is easy to install and replace, making it an ideal choice for both professional mechanics and dedicated DIY enthusiasts. Its precise dimensions and contours ensure a secure fit in the transmission shaft housing, minimizing the need for extensive modifications or adjustments during installation.

The National C491 79-8 Transmission Shaft Seal is specifically designed for the unique requirements of Chevrolet C20 models from 1964 to 1968. By choosing this seal, you can trust that you are investing in a part that delivers superior functionality and fits perfectly in your vehicle.

In summary, the National C491 79-8 Transmission Shaft Seal is an essential upgrade for any Chevrolet C20 owner seeking to maintain or restore their vehicle's transmission system. Its advanced design, durability, and ease of installation make it an indispensable component for ensuring the long-term health and performance of your transmission.

Buying a national C491 79-8 transmission shaft seal for a 1964-1968 Chevrolet C20 comes with several pros and cons that are essential to consider before making a purchase.

1. Availability: National seal is widely available in the aftermarket, making it easier to find and purchase.

2. Quality: National brands like Sealed Power are known for their high-quality seals, ensuring a long-lasting solution.

3. Cost-Effective: National seals are generally more affordable than OEM seals, making them a cost-effective option.

1. Fitment: While national seals are designed to fit most applications, there is always a risk of fitment issues. It is crucial to ensure the correct part number is ordered.

2. Performance: Aftermarket seals may not perform exactly like OEM seals, but they should still provide adequate sealing for most applications.

3. Warranty: Aftermarket seals typically do not come with the same level of warranty coverage as OEM seals.

In conclusion, buying a national C491 79-8 transmission shaft seal for a 1964-1968 Chevrolet C20 can be a cost-effective and convenient solution for those looking to repair their transmission. However, there is a risk of fitment issues and potential performance differences compared to OEM seals. It is important to ensure the correct part number is ordered and to consider the level of warranty coverage before making a purchase. Ultimately, if the seal is installed correctly, it should provide adequate sealing and help keep the transmission functioning properly.

Recommendation: If you are looking for a cost-effective solution for your transmission seal replacement, a national brand like Sealed Power is a good option. Just make sure to double-check the part number and installation instructions to ensure a successful repair.

Details:

National transmission input shaft seal for 1964-1968 Chevrolet C20 pickup dd: status: in stock.

specifications differentialsdepo:

• for makes: Chevrolet
• for years: 1964–1968
• brand: National
• mpn: 1968
• placement on vehicle: Transmission Gaskets Sealing Systems
• type: Manual Transmission Input Shaft Seal
• item length: 2.750
• manufacturer warranty: 1 Year
• ipn: C491 79-8
• compatible model: C20 Pickup
• compatible year: 1968 1967 1966 1965 1964
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine National Manual Transmission Input Shaft Seal

returns differentialsdepo:

• time: 30 days
• paid by: seller
• policy: returns accepted

payments differentialsdepo:

• credit card: mastercard
• wallet: google-pay
• other

seller differentialsdepo:

• city: indianapolis, indiana
• rating: 99.0%
• # reviews: 583949

offer differentialsdepo:

• availability: in stock
• in stock #: 5
• started: october 24, 2025
• sold #: 15
• prices: $14.95–$25.01
• item condition: New
• options: ship-to-home

shipping differentialsdepo:

• transit: 3-6 days
• class: standard, expedited
• service: standard, expedited
• type: fixed

general differentialsdepo:

• category: Auto Parts > Transmission Drivetrain > Differentials, Assemblies > Additional