SKF 18903 Transfer Case Input Shaft Seal

SKF 18903 Transfer Case Input Shaft Seal

SKF 18903 is a transfer case input shaft seal built for vehicles that need reliable fluid retention at the transfer case input. It uses a polyacrylate sealing surface and precise dimensions to match the shaft and housing interface, helping maintain a clean, stable seal in demanding driveline conditions.

Compatible with Nissan Armada, Frontier, TITAN, Xterra, Pathfinder, and INFINITI QX56 applications, this seal is a direct-fit service part for a wide range of 2004-2014 four-wheel-drive and transfer case setups. The SKF 18903 is also cross-referenced to 331117S110 for the same application.

Key Features

• Transfer case input shaft seal for driveline sealing service
• Polyacrylate sealing surface type for the sealing lip interface
• Outside diameter: 2.809 in.
• Shaft diameter: 1.890 in.
• Width: 0.315 in.
• Fits Nissan Armada, Frontier, TITAN, Xterra, Pathfinder, and INFINITI QX56 applications
• SKF 18903 replacement part number for transfer case sealing repair

Detailed Description

SKF has a long history in shaft seal engineering, and this transfer case input shaft seal reflects that experience with application-specific design and premium material selection. The seal is manufactured to the stated dimensions for the shaft and housing interface, helping maintain proper sealing performance where transfer case lubricant must stay contained and road contaminants must stay out. For service work on Nissan Armada, Frontier, TITAN, Xterra, Pathfinder, and INFINITI QX56 models, SKF 18903 provides a focused replacement option for the transfer case input location.

What It Helps Address

• Transfer case fluid seepage at the input shaft area
• Contamination entering the transfer case through a worn seal
• Seal wear from age, heat, and driveline use
• Leak-related low fluid condition in the transfer case
• Noise or driveline concerns associated with inadequate sealing

Installation Notes and Tips

Verify shaft diameter, outside diameter, and width before installation to confirm the seal matches the transfer case opening and input shaft. Inspect the shaft surface for grooves, corrosion, or damage that could affect sealing performance. Clean the bore and sealing surface thoroughly before pressing the new seal into place, and follow the vehicle service procedure for the correct installation depth and orientation.

Fits 2005-2014 Nissan Armada, N/A; Fits 2005-2014 Nissan Frontier, N/A; Fits 2004-2014 Nissan TITAN, N/A; Fits 2005-2014 Nissan Xterra, N/A; Fits 2005-2012 Nissan Pathfinder, N/A; Fits 2004-2010 INFINITI QX56, N/A.

Quality Assurance

SKF designs and manufactures seals to high quality standards, using materials selected for the application and operating environment. The brand’s seal engineering heritage includes the first integrated shaft seal, introduced in 1928, and continued development focused on long service life and dependable sealing performance.