NATIONAL SX-623Z Shaft Seal Kit Manual Transmission K15

( Brand: National ), ( Manufacturer Part Number: SX-623Z ), ( Type: Manual Transmission Output Shaft Seal Kit ), ( Manufacturer Warranty: 1 Year ), ( Ipn: C491 38-43 ), ( Item Length: 2.750 ), ( Placement On Vehicle: Transmission Gaskets Sealing Systems ), ( Compatible Model: K15 ), ( 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 K15 Manual Transmission fits 1975–1978

The National SX-623Z Shaft Seal Kit is specifically designed for the manual transmission of 1975-1978 GMC K15 trucks. This kit provides a complete replacement for the worn-out or damaged shaft seals in your vehicle's powertrain, ensuring a reliable and efficient performance.

The SX-623Z kit includes six (6) high-quality shaft seals, each engineered to provide an optimal seal against power transmitted through the driveshaft. These seals are precision-machined from a durable, heat-resistant material that can withstand the harsh conditions of regular use in a heavy-duty vehicle application.

The outer diameter of these seals ranges from 1.375 inches to 1.618 inches, with the appropriate length to fit the specific applications in your GMC K15's manual transmission. Each seal comes with a retainer and a new gasket to ensure a perfect seal and minimize any potential leakage.

Installation of the National SX-623Z Shaft Seal Kit is relatively straightforward. The kit includes detailed instructions to guide you through the process, ensuring that you can confidently complete the repair yourself. However, if you prefer, you can also take your vehicle to a professional mechanic for the installation.

By upgrading your vehicle with this high-quality shaft seal kit, you'll not only prevent potential leaks, but you'll also improve the overall performance and longevity of your GMC K15's manual transmission. With the National SX-623Z Shaft Seal Kit, you can trust that your vehicle will continue to run smoothly and efficiently for years to come.

Pros and Cons of Buying a National SX-623Z Shaft Seal Kit for 1975-1978 GMC K15 Manual Transmission

a. Designed Specifically: The National SX-623Z shaft seal kit is manufactured specifically for the 1975-1978 GMC K15 manual transmission, ensuring a perfect fit and compatibility with your vehicle.

b. High-Quality Materials: The kit includes high-quality seals made from advanced materials to ensure effective sealing and prevent leaks.

c. Complete Kit: The National SX-623Z shaft seal kit is a complete set, including all necessary seals and hardware, making it a one-stop solution for your transmission seal replacement needs.

d. Easy Installation: The seals are designed for easy installation, which can save you time and money on labor costs.

e. Reputable Brand: National is a reputable brand in the automotive aftermarket, known for producing reliable and durable parts.

a. Cost: The National SX-623Z shaft seal kit may be more expensive than some aftermarket alternatives or used seals, which could be a consideration for those on a tight budget.

b. Availability: Depending on your location and the specific seals required, you may need to order the kit online, which could result in a longer wait time for the parts.

The National SX-623Z shaft seal kit offers several advantages, such as its perfect fit for the 1975-1978 GMC K15 manual transmission, high-quality materials, complete kit, easy installation, and reputation as a reliable brand. However, its cost and potential availability may be drawbacks for some buyers. Ultimately, the decision to purchase the National SX-623Z shaft seal kit depends on your budget, installation preferences, and the importance of having a high-quality, long-lasting sealing solution for your transmission.

If you value the benefits of a perfect fit, high-quality materials, and a complete kit, and are willing to invest in a reliable and durable sealing solution for your 1975-1978 GMC K15 manual transmission, the National SX-623Z shaft seal kit is a recommended option. If cost is a major concern, you may want to explore alternative aftermarket options or used seals. Regardless of your decision, ensure that you choose a reputable supplier to ensure the authenticity and quality of the seals you purchase.

Details:

National Output Shaft Seal Kit for 1975-1978 GMC K15 Manual Transmission yy: Status: In Stock.

part #: sx623z price

• $17.99

specifications manutransmission:

• for makes: Gmc
• for years: 1975-1978
• brand: National
• mpn: Sx-623z
• type: Manual Transmission Output Shaft Seal Kit
• manufacturer warranty: 1 Year
• ipn: C491 38-43
• item length: 2.750
• placement on vehicle: Transmission Gaskets Sealing Systems
• compatible model: K15
• 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

payments manutransmission:

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

shipping manutransmission:

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

seller manutransmission:

• city: Indianapolis, Indiana
• rating: 99.6%
• # reviews: 646848

general manutransmission:

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

offer manutransmission:

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

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