Keep transmission lubricant sealed inside the gearbox and road grime out with the SKF Manual Transmission Seal 18521. This rear seal is a direct-fit replacement for many vehicles, among them the 1988-1991 Chevrolet C1500, 1999-2007 Chevrolet Silverado 1500 and 1999-2007 GMC Sierra 1500. See the "Vehicles it fits" section for the full list and engine details.
SKF invented the first integrated shaft seal in 1928 and has kept developing new seal designs and bonding techniques since then. Each seal is built to a specific design using premium materials selected for the application and the environment it works in. The goal is to keep lubricants in and contaminants out.
The seal body stays stationary while its sealing lip rides against the rotating shaft, holding lubricant at the rear of the manual transmission. Signs this part may need replacing include lubricant seeping or dripping from the back of the transmission, wet residue around the seal area, or a transmission lubricant level that keeps dropping. Confirm the source of the leak before you replace the seal.
Interchange: 4528N · 4132889100 · 23049496 · 27SS2889
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This part cross-references / interchanges with the following part numbers:
What does the SKF 18521 seal do?
It is a rear manual transmission seal. The body stays stationary while its lip rides on the rotating shaft, which helps keep transmission lubricant in and dirt and water out.
Which vehicles does the SKF 18521 fit?
Listed applications include the 1988-1991 Chevrolet C1500, 1999-2007 Chevrolet Silverado 1500 and 1999-2007 GMC Sierra 1500. See the "Vehicles it fits" section for the full list.
What part numbers does the SKF 18521 interchange with?
It cross-references to 4528N, 4132889100, 23049496 and 27SS2889.
What are signs a rear manual transmission seal may need replacing?
Warning signs include lubricant seeping or dripping from the rear of the transmission, wet residue around the seal, or a lube level that keeps dropping. Confirm the leak source before replacing the seal.
How is the SKF 18521 constructed?
The case is made of deep drawn sheet steel for a rigid, stress-resistant body. The garter spring uses cold drawn steel wire for fluid retention.
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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.
