NATIONAL SX-5MHA Shaft Seal Kit Manual Transmission C15

( Brand: National ), ( Manufacturer Part Number: SX-5MHA ), ( Type: Manual Transmission Output Shaft Seal Kit ), ( Manufacturer Warranty: 1 Year ), ( Ipn: C171 49-15 ), ( Item Length: 2.750 ), ( Placement On Vehicle: Transmission Gaskets Sealing Systems ), ( Compatible Model: C15 ), ( Compatible Year: 1978 1977 1976 1975 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine National Manual Transmission Output Shaft Seal Kit )

Review NATIONAL Output Shaft Seal Kit For Gmc C15 Manual Transmission Hd fits 1975–1978

Introducing the National SX-5MHA Shaft Seal Kit, specifically designed for the manual transmission of 1975-1978 GMC C15 trucks. This essential component is a must-have for maintaining the optimal performance and longevity of your vehicle's powertrain.

The SX-5MHA Shaft Seal Kit includes all the necessary parts to replace the worn-out or damaged seals in your transmission's input and output shafts. Each seal is precision-engineered using high-quality materials to provide an effective seal against transmission fluid leakage. The kit comprises of:

1. Two (2) Input Shaft Seals: These seals prevent transmission fluid from escaping around the input shaft, maintaining the hydraulic pressure required for smooth gear engagement.

2. Two (2) Output Shaft Seals: These seals seal the area around the output shaft, stopping any transmission fluid leakage and ensuring that the power is transmitted efficiently from the transmission to the driveshaft.

3. Two (2) Shaft Collars: These collars securely hold the seals in place on the input and output shafts, ensuring a proper seal and preventing any potential leaks.

4. Two (2) Retaining Rings: These rings help in retaining the collar and seal assembly in the correct position on the shaft.

Installation of the National SX-5MHA Shaft Seal Kit is relatively straightforward and can be accomplished with basic hand tools. However, if you are not comfortable performing this repair yourself, we recommend seeking the assistance of a professional mechanic to ensure the job is done correctly and safely.

By choosing the National SX-5MHA Shaft Seal Kit, you can rest assured that you're getting a reliable, high-quality product that is specifically designed for your GMC C15 manual transmission. Replacing worn-out seals promptly will not only help prevent potential leaks but also contribute to the overall longevity and performance of your vehicle.

Pros and Cons of Buying a National SX-5MHA Shaft Seal Kit for 1975-1978 GMC C15 Manual Transmission

The National SX-5MHA Shaft Seal Kit is designed for 1975-1978 GMC C15 manual transmission vehicles. This kit includes all the necessary components to replace the worn-out shaft seals in your transmission. Let's evaluate the potential advantages and disadvantages of purchasing this product.

1. OEM-equivalent quality: National is a reputable brand known for manufacturing high-quality parts. This shaft seal kit is designed to be an OEM (Original Equipment Manufacturer) equivalent, ensuring a perfect fit and reliable performance.

2. Complete kit: The National SX-5MHA Shaft Seal Kit includes all the necessary components needed to replace the old seals in your transmission, making it a convenient and cost-effective solution.

3. Reduces leaks: Worn-out shaft seals can cause transmission fluid leaks, leading to costly repairs and potential damage to other components. By replacing these seals with a new kit, you can prevent further leaks and save money in the long run.

4. Improves transmission efficiency: A leaking transmission can lead to a loss of power and reduced efficiency. By addressing the issue with a new seal kit, you can help improve the overall performance of your transmission.

5. Easy installation: The National SX-5MHA Shaft Seal Kit is designed for easy installation, making it a DIY (Do-It-Yourself) friendly option for those who prefer to tackle repairs on their own.

1. Cost: While the National SX-5MHA Shaft Seal Kit offers a cost-effective solution compared to a full transmission rebuild or replacement, it may still be a significant investment for some.

2. Availability: Depending on your location and the availability of local auto parts stores, you may need to order the kit online or wait for it to be shipped, which could add to the overall time and cost of the repair.

3. Potential for errors during installation: While the National SX-5MHA Shaft Seal Kit is designed for easy installation, there is still a chance for errors or misalignment during the process, which could lead to further issues or the need for additional repairs.

The National SX-5MHA Shaft Seal Kit is a worthwhile investment for 1975-1978 GMC C15 manual transmission vehicle owners experiencing transmission leaks or reduced efficiency. The kit offers OEM-equivalent quality, a complete solution, and the potential for improved transmission performance. However, it may come with a significant cost and potential installation errors. Ultimately, the decision to purchase this kit depends on your comfort level with the repair process, the availability of local parts, and your budget for the project.

If you're confident in your DIY skills, have the necessary tools, and are committed to saving money on transmission repairs, the National SX-5MHA Shaft Seal Kit is a solid choice. However, if you're unsure about the installation process, prefer a more hands-off approach, or have the financial means to invest in a more extensive repair, you may want to consider alternative options like a professional transmission repair or replacement.

Details:

National Output Shaft Seal Kit for 1975-1978 GMC C15 Manual Transmission hd: Status: In Stock.

part #: sx5mha prices

• $17.99-$22.68

specifications manutransmission:

• for makes: Gmc
• for years: 1975-1978
• brand: National
• mpn: Sx-5mha
• type: Manual Transmission Output Shaft Seal Kit
• manufacturer warranty: 1 Year
• ipn: C171 49-15
• item length: 2.750
• placement on vehicle: Transmission Gaskets Sealing Systems
• compatible model: C15
• compatible year: 1978 1977 1976 1975
• core charge: Free No Core Charge
• fitment type: Direct Replacement
• bundle description: 1 Pc Genuine National Manual Transmission Output Shaft Seal Kit

returns manutransmission:

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

seller manutransmission:

• rating: 99.6%
• city: Indianapolis, Indiana
• # reviews: 646873

offer manutransmission:

• availability: In Stock
• sold: 0
• quantity: 3
• started: April 18, 2026
• options: Ship-to-home

payments manutransmission:

• credit card: Visa
• wallet: Apple-pay
• other

shipping manutransmission:

• type: Fixed
• service: Standard, Expedited
• cost: $0.00
• class: Standard, Expedited
• transit: 4-7 Days

general manutransmission:

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

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