SX-A3H8 NATIONAL Transmission Shaft Seal Manual Gaskets Ou

Review NATIONAL Transmission Input Shaft Seal For Gmc P15 Manual Gaskets Ou for GMC 1975–1978

National SX-A3H8 Transmission Shaft Seal for 1975-1978 GMC P15

The National SX-A3H8 Transmission Shaft Seal is an essential component designed specifically for the manual transmission systems of 1975-1978 GMC P15 pickups. This seal is engineered to provide an effective solution for leakages that may occur around the transmission shaft.

Constructed from a high-quality, heavy-duty rubber compound, this seal ensures a perfect fit and an unbeatable seal. Its unique design includes an inner lip that contacts the shaft, preventing any potential leakages from the transmission fluid. The outer edge of the seal features a carefully engineered shape that seals tightly against the housing, preventing any external contaminants from entering the transmission system.

The SX-A3H8 seal is easy to install and can be done as a DIY project for those who are comfortable working on their vehicles. It is crucial to drain the transmission fluid before installing the new seal to ensure a clean and hassle-free installation process. The seal comes with clear installation instructions to guide users through the process.

This National transmission shaft seal is manufactured to meet or exceed OE specifications, ensuring optimal performance and reliability. It is a direct replacement for the original equipment seal, providing a cost-effective solution for those seeking to maintain their GMC P15's transmission system without the need for expensive repairs or rebuilds.

In summary, the National SX-A3H8 Transmission Shaft Seal for 1975-1978 GMC P15 pickups is an essential upgrade for those seeking to maintain the performance and longevity of their manual transmission system. Its high-quality materials, precise fit, and easy installation process make it an excellent choice for both professional mechanics and dedicated DIY enthusiasts.

Pros and Cons of Buying a National SX-A3H8 Transmission Shaft Seal for 1975-1978 GMC P15

a. Designed specifically for the 1975-1978 GMC P15: This seal is a direct replacement for the original part, ensuring a proper fit and function.

b. High-quality materials: National is known for producing reliable and durable parts, which is crucial for transmission seals.

c. Reduces leaks: A faulty transmission shaft seal can lead to significant fluid leaks. Replacing it with a new one can help prevent these leaks and save you money on repairs.

d. Improves transmission performance: A leaking seal can cause power loss and poor shifting. Replacing it can improve the overall performance of the transmission.

e. OEM-equivalent: The National SX-A3H8 transmission shaft seal is an OEM-equivalent part, meaning it offers the same level of quality and performance as the original seal.

a. Cost: While the National SX-A3H8 transmission shaft seal is a high-quality part, it may be more expensive than some aftermarket alternatives.

b. Installation difficulty: Depending on your mechanical skills and experience, installing a transmission shaft seal can be a challenging process.

c. Availability: This seal might not be readily available at all auto parts stores, so you may need to order it online or from a specialized dealer.

The National SX-A3H8 transmission shaft seal for 1975-1978 GMC P15 offers several advantages, including a proper fit, high-quality materials, leak reduction, and improved transmission performance. However, it may come with a higher cost and installation challenges. Ultimately, if you want a reliable and long-lasting seal, the National SX-A3H8 is a worthwhile investment.

If you're looking for a high-quality and reliable transmission shaft seal for your 1975-1978 GMC P15, the National SX-A3H8 is a solid choice. It may cost more than some aftermarket alternatives, but its OEM-equivalent design and superior materials ensure a proper fit and superior performance. Additionally, if you're unsure about the installation process, consider having it done by a professional mechanic to ensure everything is done correctly.

Details:

National transmission input shaft seal for 1975-1978 Gmc p15 manual gaskets ou: status: in stock.

specifications differentialsdepo:

• for makes: Gmc
• for years: 1975–1978
• brand: National
• mpn: Sx-a3h8
• placement on vehicle: Transmission Gaskets Sealing Systems
• type: Manual Transmission Input Shaft Seal
• item length: 2.750
• manufacturer warranty: 1 Year
• ipn: C198 27-18
• compatible model: P15
• compatible year: 1978 1977 1976 1975
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine National Manual Transmission Input Shaft Seal

shipping differentialsdepo:

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

seller differentialsdepo:

• city: indianapolis, indiana
• # reviews: 600743
• rating: 99.3%

offer differentialsdepo:

• prices: $185.71–$196.53
• item condition: New
• sold #: 11
• started: december 7, 2025
• options: ship-to-home
• availability: in stock
• in stock #: 3

payments differentialsdepo:

• wallet: paypal
• other
• credit card: diners-club

returns differentialsdepo:

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

general differentialsdepo:

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