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  3. NATIONAL SX-431D

NATIONAL SX-431D Transfer Shaft Seals K15

fits model: Suburban. make: Gmc. year: 1975–1978.

Sx-431d National 2 Pc Transfer Case Shift Shaft Seals For 1975-1978 Gmc K15 Suburban Ea

( Brand: National ), ( Manufacturer Part Number: SX-431D ), ( Type: Transfer Case Shift Shaft Seal ), ( Ipn: C637 58-25 ), ( Item Length: 2.000 ), ( Manufacturer Warranty: 1 Year ), ( Placement On Vehicle: Transfer Case Gaskets Sealing Systems ), ( Compatible Model: K15 Suburban ), ( Compatible Year: 1978 1977 1976 1975 ), ( Core Charge: Free No Core Charge ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 2 Pc Genuine National Transfer Case Shift Shaft Seal Kit )

Review NATIONAL Pc Transfer Case Shift Shaft Seals For Gmc K15 Ea fits SUBURBAN 1975–1978

Introducing the National SX-431D Transfer Shaft Seals, specifically designed for the 1975-1978 GMC K15 Suburban models. These transfer shaft seals are an essential component of your vehicle's drivetrain system, responsible for preventing the transfer of power from the transmission to the drivelines while also keeping out contaminants such as water, debris, and lubricants.

The National SX-431D Transfer Shaft Seals are engineered using high-quality materials that ensure a perfect fit and long-lasting performance. Each seal is manufactured with a precision-molded lip that conforms to the transfer shaft's surface, creating a tight and effective seal. The material used is a durable rubber compound that provides excellent resistance to wear, tear, and the harmful effects of various fluids and environmental conditions.

These transfer shaft seals come as a complete kit, including all necessary seals for the specific application. Each seal is carefully packaged to ensure protection during transportation and to prevent damage during installation.

Installing the National SX-431D Transfer Shaft Seals is a straightforward process that can be completed by most DIY enthusiasts with basic mechanic skills. The kit includes clear and detailed installation instructions to guide you through the process step by step.

By replacing your worn or damaged transfer shaft seals with these high-quality National SX-431D Transfer Shaft Seals, you'll not only improve the overall performance and efficiency of your GMC K15 Suburban but also extend the life of your drivetrain components.

These transfer shaft seals are a worthwhile investment for any Suburban owner looking to maintain the reliability and longevity of their vehicle. So, if you're experiencing leaks, unusual noises, or reduced power transmission, don't hesitate to upgrade to the National SX-431D Transfer Shaft Seals.

Pros and Cons of Buying National SX-431D Transfer Shaft Seals for 1975-1978 GMC K15 Suburban

1. Understanding the Part:

The National SX-431D transfer shaft seal is designed for use in 1975-1978 GMC K15 Suburban vehicles. It is a critical component of the transfer case, responsible for preventing oil leakage.

2. Pros of Buying National SX-431D Transfer Shaft Seals:

a. OEM Replacement: These seals are manufactured to meet or exceed the original equipment specifications, ensuring a proper fit and function.

b. Improved Performance: New seals can help reduce oil leaks, improve transfer case efficiency, and extend the overall life of the transfer case.

c. Availability: These seals are readily available at various automotive parts stores and online marketplaces, making them a convenient option for those in need.

3. Cons of Buying National SX-431D Transfer Shaft Seals:

a. Cost: Replacing transfer shaft seals can be an expensive repair, especially when considering labor costs if professional installation is required.

b. Potential for Pre-existing Damage: If there are other issues with the transfer case, such as worn gears or damaged bearings, the new seals may not provide a long-term solution.

4. Ending Conclusion:

While the National SX-431D transfer shaft seals offer the benefits of OEM quality and improved performance, their high cost and potential for pre-existing damage may be a deterrent for some. Ultimately, the decision to purchase these seals depends on the individual's budget, vehicle condition, and personal priorities.

5. Recommendation:

If your 1975-1978 GMC K15 Suburban is experiencing persistent oil leaks from the transfer case and you are committed to addressing the issue, purchasing National SX-431D transfer shaft seals could be a worthwhile investment. However, it is essential to consider the potential costs and other potential causes of the oil leak before making a final decision. If you are unsure about the extent of the damage, it may be wise to consult a professional mechanic for an assessment.

Details:

2 pc National Transfer Case Shift Shaft Seals for 1975-1978 GMC K15 Suburban ea: Status: In Stock.

part #: sx431d prices

  • $17.40-$50.78

specifications manutransmission:

  • for models: Suburban
  • for makes: Gmc
  • for years: 1975-1978
  • brand: National
  • mpn: Sx-431d
  • type: Transfer Case Shift Shaft Seal
  • ipn: C637 58-25
  • item length: 2.000
  • manufacturer warranty: 1 Year
  • placement on vehicle: Transfer Case Gaskets Sealing Systems
  • compatible model: K15 Suburban
  • compatible year: 1978 1977 1976 1975
  • core charge: Free No Core Charge
  • fitment type: Direct Replacement
  • bundle description: 2 Pc Genuine National Transfer Case Shift Shaft Seal Kit

seller manutransmission:

  • city: Indianapolis, Indiana
  • # reviews: 581163
  • rating: 99.0%

payments manutransmission:

  • wallet: Paypal
  • credit card: Discover
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returns manutransmission:

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

shipping manutransmission:

  • service: Standard, Expedited
  • transit: 3-5 Days
  • type: Fixed
  • class: Standard, Expedited
  • cost: $0.00

general manutransmission:

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

offer manutransmission:

  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • started: October 17, 2025
  • quantity: 3
for models: suburban, for makes: gmc, for years: 1975-1978, type: transfer case shift shaft seal, item length: 2.000, manufacturer warranty: 1 year, placement on vehicle: transfer case gaskets sealing systems, compatible model: k15 suburban, compatible year: 1978 1977 1976 1975, core charge: free no core charge, fitment type: direct replacement, bundle description: 2 pc genuine national transfer case shift shaft seal kit,
category: auto parts > car truck parts accessories > transmission drivetrain > manual transmission parts, sku: 8661173797096792,

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