Keep gear lubricant sealed inside the axle and road grime out with the SKF differential pinion seal, part number 18831. Built for the rear differential, it installs as a direct-fit replacement on many vehicles, among them the 2003-2012 Nissan Frontier, 2003-2012 Nissan Pathfinder and 2005-2015 Nissan Armada. See the "Vehicles it fits" section for the full list and engine-specific details.
The seal sits in the rear differential housing at the pinion, where the driveshaft connects. Its body stays stationary while its lip contacts the rotating pinion, holding lubricant in and helping keep contaminants out.
SKF introduced the first integrated shaft seal in 1928 and has kept developing new seal designs and bonding techniques since then. It builds its seals to specific designs with premium materials, chosen to suit both the application and its operating environment.
If you're planning a pinion seal replacement, watch for signs that the original may be failing. These include gear-oil seepage or drips where the driveshaft meets the differential, and oily grime building up on the housing. Confirm the source of the leak before replacing the seal.
Interchange: 38189-ZJ00A
2004958 · 38189ZJ00A
This part cross-references / interchanges with the following part numbers:
What does the SKF 18831 pinion seal do?
It seals the rear differential housing around the rotating pinion. That keeps lubricant inside and helps block dirt and water from getting in.
Is this the right part for a 2003-2012 Nissan Frontier pinion seal replacement?
Yes. It is listed for the 2003-2012 Nissan Frontier, 2003-2012 Nissan Pathfinder and 2005-2015 Nissan Armada. See the "Vehicles it fits" section for the full list and engine details.
How is this seal constructed?
The body is made from deep drawn sheet steel, forming a rigid, stress-resistant metal case. The garter spring uses cold drawn steel wire.
What are signs a pinion seal may need replacing?
Common signs are gear-oil seepage or drips where the driveshaft meets the differential, and oily grime on the housing. Diagnose the leak source before replacing the seal.
Is this seal for the front or rear differential?
SKF 18831 is cataloged for the rear differential pinion on the listed Nissan applications.
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WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
