Keep differential lubricant where it belongs with the SKF differential pinion seal, part number 21955, built to seal the pinion opening of the rear differential. It is a direct-fit replacement for the listed Chevrolet and GMC applications, including the 1975-1996 Chevrolet G30, 1979-1996 GMC G3500, 1988-1997 Chevrolet C2500, 1988-1997 Chevrolet K2500 and 1996-1997 Chevrolet Express 2500. See the "Vehicles it fits" section for the full vehicle list and engine details.
The seal body stays stationary at the pinion opening while its lip seals against the rotating pinion yoke or flange. Signs this seal may need replacing include lubricant seeping or dripping at the front of the rear differential where the driveshaft connects, and a low differential fluid level. Diagnose the source of any leak before replacing parts.
SKF has a long history in seal design and development, beginning with its invention of the first integrated shaft seal in 1928, and it has continued to develop new designs and bonding techniques. Its seals are made to specific designs from premium materials chosen to suit both the application and its operating environment.
Interchange: 2286.1 · 683-8345 · CHR 21955 · 432-1955
22861 · 6838345 · CHR21955 · 4321955 · 02190351059 · 4133147100 · 975921955 · 26004811 · 3977359 · 145821955 · X91516 · 2286BN · 21955CHR · N21955 · 47530
This part cross-references / interchanges with the following part numbers:
What does the SKF differential pinion seal do?
It seals the pinion opening of the rear differential. It keeps lubricant in and helps keep dirt and water out while its lip rides against the rotating pinion yoke or flange.
Which vehicles does SKF 21955 fit?
It fits many Chevrolet and GMC trucks and vans, including the 1988-1997 Chevrolet C2500 and the 1979-1996 GMC G3500. See the "Vehicles it fits" section for the full list.
What are signs a pinion seal may need replacing?
Common signs are lubricant seeping or dripping at the front of the rear differential near the driveshaft, and a low differential fluid level. Confirm the source of the leak before replacing the seal.
How is the SKF 21955 seal constructed?
The body uses deep drawn sheet steel for a rigid, stress-resistant metal case. The garter spring uses cold drawn steel wire for fluid retention.
What part numbers does SKF 21955 replace?
It cross-references numbers including CHR 21955, 683-8345, 432-1955, 2286.1, 3977359 and 26004811. See the Interchange line for the complete list.
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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.
