FAG SS2776 Differential Pinion Seal - Rear

FAG SS2776 Differential Pinion Seal

FAG SS2776 is a differential pinion seal built for rear axle service on a wide range of classic Chevrolet, GMC, Buick, Oldsmobile, and Pontiac applications. It uses a nitrile sealing material with a metal spring and auxiliary lip design to help retain lubricant and block contamination at the pinion area.

For drivers searching for a rear differential pinion seal for a 1975-1981 Chevrolet G10, a 1979-1981 GMC K1500, or a 1965-1979 Chevrolet Corvette, this FAG seal is sized for specific axle applications and OE-style service replacement.

Key Features

• Brand: FAG
• Part number: SS2776
• Part type: Differential pinion seal
• Seal type: Metal, spring, auxiliary lip
• Sealing material: Nitrile
• Bore diameter: 2.812 in. / 71.425 mm
• Seal outside diameter: 2.816 in. / 71.526 mm
• Seal width: 1.739 in. / 44.171 mm

Detailed Description

FAG SS2776 is engineered for rear differential pinion sealing where precise dimensions matter. The nitrile sealing element is paired with a metal case, spring tension, and auxiliary lip to help maintain a consistent seal at the pinion opening. This matters in applications such as Chevrolet C10, Chevrolet K10, GMC Jimmy, Pontiac GTO, and other rear axle platforms listed in the fitment data.

This part cross-references Bosch 17190 and National 8460N for the same application. Use the listed vehicle notes to confirm axle configuration, including 8.875" ring gear and 12-bolt cover references where shown. The FAG SS2776 part number is also commonly searched as SS2776 when sourcing a rear pinion seal for older GM driveline service.

What It Helps Address

• Gear oil seepage at the differential pinion area
• Contamination from dirt, dust, and moisture entering the axle housing
• Loss of lubricant around the pinion shaft seal surface
• Service replacement on worn or hardened rear axle seals
• Noise or driveline issues caused by low differential fluid level

Installation Notes and Tips

Confirm bore diameter, seal outside diameter, and seal width before installation. Match the vehicle, axle, and position exactly as listed; this seal is used in rear applications and some fitments include notes for 8.875" ring gear or 12-bolt cover configurations. Inspect the pinion surface for wear or scoring before pressing in the new seal, and verify proper seating depth during assembly.

Quality Assurance

FAG sources seals using materials selected to meet vehicle manufacturer specifications and works with suppliers to maintain FAG quality standards. The seal design is intended to protect wheel-end and driveline components from contamination while helping preserve lubricant over the service life of the bearing or axle assembly.