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  3. NATIONAL SX-40D4

NATIONAL SX-40D4 Rear Outer Differential Pinion Seal Avanti Ku

fits year: 1987–2001.

Sx-40d4 National Rear Outer Differential Pinion Seal For 1987-2001 Avanti Ii Ku

( Brand: National ), ( Manufacturer Part Number: SX-40D4 ), ( Manufacturer Warranty: 1 Year ), ( Ipn: C156 9-14 ), ( Placement On Vehicle: Driveline Axles Gaskets Sealing Systems ), ( Compatible Make: Avanti ), ( Compatible Model: Ii ), ( Compatible Year: 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989 ), ( Core Charge: Free No Core Charge ), ( Position: Rear Outer ), ( Type: Differential Pinion Seal ), ( Fitment Type: Direct Replacement ), ( Bundle Description: 1 Pc Genuine National Differential Pinion Seal )

Review NATIONAL Rear Outer Differential Pinion Seal For Avanti Ku fits 1987–2001

Introducing the National SX-40D4 Rear Outer Differential Pinion Seal, an essential component for maintaining the performance and longevity of your 1987-2001 Avanti or Ku's rear differential system. This seal is specifically engineered to provide a perfect fit and reliable sealing for the pinion shaft, preventing oil leakage and ensuring optimal differential function.

The National SX-40D4 Rear Outer Differential Pinion Seal is manufactured from high-quality materials that offer superior flexibility and resistance to wear and tear. Its durable rubber compound is engineered to withstand the harsh conditions of regular use, while its precise dimensions ensure a secure and snug fit in the differential housing.

This seal is easy to install, making it an ideal solution for DIY enthusiasts and professional mechanics alike. Its design allows for simple removal of the old seal and installation of the new one without requiring any special tools or extensive disassembly of the differential unit.

By installing a new National SX-40D4 Rear Outer Differential Pinion Seal, you'll be able to enjoy the peace of mind that comes with knowing your differential system is sealed tightly and operating at peak performance. This seal is an essential preventative maintenance item and an important investment in the longevity of your vehicle's drivetrain.

In summary, the National SX-40D4 Rear Outer Differential Pinion Seal is a high-quality, durable, and easy-to-install component that is crucial for maintaining the performance and reliability of your 1987-2001 Avanti or Ku's rear differential system. Its precise fit, superior flexibility, and resistance to wear and tear make it an ideal solution for preventing oil leakage and ensuring optimal differential function.

The National SX-40D4 rear outer differential pinion seal is a crucial component in maintaining the differential system of a 1987-2001 Avanti KU. This seal prevents oil leakage from the pinion shaft and keeps the differential fluid inside the housing. Here are some pros and cons to consider before purchasing this part.

Pros:

1. Improved Durability: A new pinion seal can prevent oil leaks and extend the life of the differential system.

2. Enhanced Performance: Proper sealing ensures that the differential fluid remains in place, reducing power loss and improving overall performance.

3. Better Fuel Economy: With the differential system functioning correctly, the engine does not have to work harder to compensate for the loss of power, which can lead to better fuel economy.

Cons:

1. Cost: Replacement parts can be expensive, and this seal is no exception.

2. Installation Complexity: The process of replacing the pinion seal can be time-consuming and may require specialized tools and expertise.

3. Potential for Additional Repairs: If the pinion seal has failed, there may be underlying issues with the differential system that need to be addressed.

In conclusion, while the National SX-40D4 rear outer differential pinion seal for a 1987-2001 Avanti KU can offer improved durability, enhanced performance, and better fuel economy, it comes with a cost and the potential complexity of installation. If you notice excessive oil leakage from your differential system, it is recommended to replace the pinion seal as soon as possible to prevent further damage and ensure the proper functioning of your vehicle.

Recommendation: If you are comfortable with the cost and the installation process, or if you have a trusted mechanic to help you with the procedure, then purchasing the National SX-40D4 rear outer differential pinion seal is a worthwhile investment for the long-term health of your Avanti KU. If you are unsure, it may be wise to consult a professional mechanic for advice before making a decision.

Details:

National Rear Outer Differential Pinion Seal for 1987 - 2001 Avanti II ku: Status: In Stock.

part #: sx40d4 price

  • $20.89

specifications parthick:

  • for years: 1987-2001
  • brand: National
  • mpn: Sx-40d4
  • manufacturer warranty: 1 Year
  • ipn: C156 9-14
  • placement on vehicle: Driveline Axles Gaskets Sealing Systems
  • compatible make: Avanti
  • compatible model: Ii
  • compatible year: 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989
  • core charge: Free No Core Charge
  • position: Rear Outer
  • type: Differential Pinion Seal
  • fitment type: Direct Replacement
  • bundle description: 1 Pc Genuine National Differential Pinion Seal

offer parthick:

  • availability: In Stock
  • sold: 0
  • options: Ship-to-home
  • started: April 11, 2026
  • quantity: 4

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

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

general parthick:

  • condition: New
  • Parts Accessories > Car Truck Parts Accessories > Other Car Truck Parts Accessories

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  • # reviews: 644003
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  • city: Indianapolis, Indiana

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for years: 1987-2001, manufacturer warranty: 1 year, placement on vehicle: driveline axles gaskets sealing systems, compatible make: avanti, compatible model: ii, compatible year: 2001 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989, core charge: free no core charge, position: rear outer, type: differential pinion seal, fitment type: direct replacement, bundle description: 1 pc genuine national differential pinion seal,
category: auto parts > car truck parts accessories, sku: 15590345092578603,

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