Keep lubricant in and dirt and water out at the rear output shaft with the SKF 21768 Automatic Transmission Seal / Transfer Case Output Shaft Seal. It fits many vehicles as a direct-fit replacement for the listed applications, among them the 2007-2015 GMC Sierra 2500 HD, the 2007-2015 Chevrolet Silverado 2500 HD and the 2009-2013 Chevrolet Suburban 2500. The part is cataloged under both names and fits the rear position.
The seal body stays stationary while its lip contacts the rotating output shaft.
- Protection against dirt and water: Designed to give superior protection from dirt and water.
- Rigid metal case: The body is deep drawn sheet steel, which forms a rigid, stress-resistant metal case.
- Garter spring: Made from cold drawn steel wire for superior fluid retention.
- Tested for correct fit: Built with a high-quality, tested design and materials for a correct fit.
SKF invented the first integrated shaft seal in 1928 and has kept developing new seal designs and bonding techniques since then. Each SKF seal is made to a specific design with premium materials, chosen to suit both the application and its environment.
Signs this seal may need replacing:
- Fluid seeping or dripping at the rear of the transmission or transfer case.
- A falling fluid level.
Other components can also leak, so confirm the source before you replace the seal.
See the "Vehicles it fits" section for the full list of vehicles and engine details.
Interchange: 710771 · 4135590100 · 24226707 · 27SS5590
This part cross-references / interchanges with the following part numbers:
21768, 24226707, 58626-1A, 710771, 4135590100, 27SS5590, 710675
Frequently Asked Questions
What does the SKF 21768 seal do?
It seals the rear output shaft. The seal body stays stationary while its lip contacts the rotating shaft, keeping lubricant in and dirt and water out.
Why is it listed as both an automatic transmission seal and a transfer case output shaft seal?
The part is cataloged under both names. It is the rear output shaft seal for the listed Chevrolet, GMC and Cadillac applications.
Which vehicles does it fit?
The listed applications include the 2007-2015 GMC Sierra 2500 HD, the 2007-2015 Chevrolet Silverado 2500 HD and the 2009-2013 Chevrolet Suburban 2500. See the "Vehicles it fits" section for the full list and engine details.
What are signs this seal may need replacing?
Fluid seeping at the rear of the transmission or transfer case, or a falling fluid level, may indicate a worn seal. Other parts can leak too, so confirm the source first.
What part numbers does SKF 21768 interchange with?
It interchanges with 710771, 4135590100, 24226707 and 27SS5590.
