FAG SS3845 Differential Pinion Seal - Rear or Rear Outer

FAG SS3845 Differential Pinion Seal

FAG SS3845 is a differential pinion seal built for driveline sealing performance where contamination control and lubricant retention matter. It uses a polyacrylate sealing material with a metal shell, spring, auxiliary lip, and inner shell construction to help maintain a secure seal at the pinion area.

For buyers searching for a differential pinion seal for FAG SS3845, this part is engineered to meet vehicle manufacturer specifications and the demanding requirements of wheel-end and driveline sealing applications. It is a direct-fit style service part for applications that call for a 98.45 mm bore diameter, 98.577 mm outside diameter, and 2.5 in. seal width.

Key Features

• Part number: SS3845
• Brand: FAG
• Category: Driveline and Axles > Gaskets and Sealing Systems
• Seal type: metal, spring, auxiliary lip, inner shell
• Sealing material: polyacrylate
• Bore diameter: 3.876 in. / 98.45 mm
• Seal outside diameter: 3.881 in. / 98.577 mm
• Seal width: 2.5 in. / 63.5 mm

Detailed Description

FAG SS3845 is designed for differential pinion sealing where the seal must help keep dirt, dust, and moisture out of the assembly while retaining grease and lubricant over service life. The metal-backed construction and spring-loaded sealing design support consistent contact at the sealing surface, while the auxiliary lip adds another layer of protection against contamination. If you are sourcing a FAG differential pinion seal for driveline service, SS3845 provides the dimensional and material details needed for application matching.

This part cross-references National 415082N for the same application. It is also associated with interchange part numbers 25102 and 4133845100.

What It Helps Address

• Gear oil seepage at the differential pinion area
• Contamination from road dirt, dust, and moisture
• Loss of lubricant from worn or damaged sealing surfaces
• Noise or driveline issues caused by seal deterioration
• Service replacement needs on vehicles using this seal specification

Installation Notes and Tips

Verify bore diameter, outside diameter, and seal width before installation to confirm the correct application. Inspect the pinion surface for wear, scoring, or corrosion, since seal performance depends on a clean and properly prepared sealing surface. Use the vehicle service procedure for the specific axle or differential assembly, and confirm the seal is seated evenly to avoid leaks.

Compatible With select vehicle applications that use this FAG SS3845 seal specification, including make/model fitments referenced by the vehicle service catalog. Search terms such as differential pinion seal for make/model service, FAG SS3845 replacement seal, and driveline seal for axle repair are commonly used by buyers comparing this part.

Quality Assurance

FAG states that its seals are engineered to meet vehicle manufacturer specifications and are developed with supplier input to maintain the brand’s quality standards. The design focus is on protecting wheel-end and driveline components from contamination while helping preserve lubricant over the life of the bearing or seal assembly. FAG SS3845 is built to the dimensional and material requirements expected in professional driveline service.