Help keep lubricant sealed inside the transfer case and dirt and water out with the SKF transfer case output shaft seal 18687. SKF also lists this part as a transfer case extension housing seal and a transfer case input shaft seal. It is a direct-fit replacement for the listed applications and fits many vehicles, including the 2013-2018 Ram 1500, 1980-2014 Ford F-150 and 2003-2012 GMC Sierra 1500. It also fits Chevrolet, Cadillac, Lincoln and Oldsmobile models. See the "Vehicles it fits" section for the full vehicle list and engine details.
The seal's case stays stationary in the housing bore while its lip contacts the rotating shaft, which helps hold lubricant in and keep contaminants out. It is cataloged for front, rear and rear rearward positions, depending on the application.
- Tested for correct fit: SKF manufactures it with a high-quality, tested design and materials.
- Dirt and water protection: The seal is designed to give superior protection against dirt and water.
- Steel garter spring: The garter springs use cold drawn steel wire for superior fluid retention.
- Rigid metal case: The body is made from deep drawn sheet steel to form a rigid, stress-resistant metal case.
SKF invented the first integrated shaft seal in 1928 and has continued to develop new designs and bonding techniques since then. Its seals are made to specific designs using premium materials chosen to suit both the application and its environment.
Signs this seal may need replacing include lubricant seepage around the shaft or housing and a low transfer case fluid level. Diagnose the source of any leak before replacing parts.
Interchange: CHR 18687
CHR18687 · 4503N · 68089735AA · 4132911100 · 2L1Z7B215A · E0TZ7B215A · E0TZ7B215B · E1TZ7B215A · E4TZ7B215B · E5TZ7B215A · E8TZ7B215A · 15580329 · 89059495 · 27SS2911
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
4503N, 68089735AA, 4132911100, 2L1Z7B215A, E0TZ7B215A, E0TZ7B215B, E1TZ7B215A, E4TZ7B215B, E5TZ7B215A, E8TZ7B215A, CHR 18687, 15580329, 89059495, 27SS2911
Frequently Asked Questions
What does the SKF 18687 seal do?
It seals the gap between the transfer case housing and a rotating shaft, helping keep lubricant in and dirt and water out. The seal case stays stationary while its lip rides on the shaft.
Is this an output shaft seal or an extension housing seal?
SKF 18687 is listed under several names: transfer case output shaft seal, extension housing seal and input shaft seal. Its cataloged position (front, rear or rear rearward) varies by application.
Which vehicles does the SKF 18687 fit?
Applications include the 2013-2018 Ram 1500, 1980-2014 Ford F-150 and 2003-2012 GMC Sierra 1500, among many others. See the "Vehicles it fits" section for the full list.
What is the seal's case made of?
SKF forms the body from deep drawn sheet steel to create a rigid, stress-resistant metal case. Its garter springs use cold drawn steel wire for fluid retention.
What are signs this seal may need replacing?
Lubricant seepage or wetness around the shaft where it exits the transfer case, or a low transfer case fluid level, may indicate a worn seal. Confirm the source of the leak before replacing.
