FAG SS3259 Differential Pinion Seal - Rear

FAG SS3259 Differential Pinion Seal

The FAG SS3259 differential pinion seal is built for rear axle sealing applications that demand accurate dimensions and dependable contamination control. It is specified for select Chevrolet and GMC trucks and vans, including Chevrolet C30, K30, P30, and GMC P3500 applications.

Key Features

• Part number: SS3259
• Seal type: metal, spring, auxiliary lip, inner shell
• Sealing material: polyacrylate
• Bore diameter: 3.481 in. / 88.417 mm
• Seal outside diameter: 3.486 in. / 88.544 mm
• Seal width: 2.598 in. / 65.989 mm
• Designed for rear and rear outer axle positions listed in the fitment data
• Cross-reference: National 411330N

Detailed Description

FAG SS3259 is a differential pinion seal engineered to match the dimensional requirements of specific rear axle applications. Its metal-and-spring construction, auxiliary lip, and inner shell design help maintain sealing integrity at the pinion area, while the polyacrylate sealing material is selected for axle service conditions. This seal is listed for 1968-1972 Chevrolet C20 Suburban and K20 Suburban rear axle applications, 1975-1981 Chevrolet C30, K30, and P30 rear applications, and 1979-1983 GMC P3500 rear applications, along with select GMC G35/G3500 Van rear outer applications.

For buyers searching for a rear differential pinion seal for Chevrolet C30, K30, or P30 trucks, or a GMC P3500 rear axle seal, SS3259 provides a direct-fit reference based on the supplied vehicle data. The listed dimensions and seal construction support proper fit at the axle housing interface and help keep lubricant where it belongs while limiting entry of dirt, dust, and moisture.

What It Helps Address

• Gear oil seepage at the differential pinion area
• Contamination entering the rear axle seal interface
• Loss of grease or lubricant around the bearing and seal area
• Wear-related sealing issues on older Chevrolet and GMC rear axle assemblies
• Replacement needs for a rear pinion seal during axle service

Installation Notes and Tips

Verify the axle type, seal dimensions, and position before installation. This part is listed for rear and rear outer applications only, so confirm the vehicle match against the supplied fitment data for Chevrolet C20 Suburban, K20 Suburban, C30, K30, P30, GMC G35/G3500 Van, and GMC P3500 models. Clean the sealing surface thoroughly and inspect the pinion area for wear, scoring, or housing damage before installing the new seal.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS3259 is built to the dimensional and material requirements shown above for the listed applications.