FAG SS4438 Differential Seal - Rear

FAG SS4438 Differential Seal for Rear Applications

The FAG SS4438 differential seal is built for rear axle service where reliable sealing is critical to driveline performance. It uses a nitrile sealing material with a metal spring and auxiliary lip design to help keep lubricant in place while blocking dirt, dust, and moisture from entering the assembly.

Compatible with select Subaru BRZ, Lexus IS300, Lexus LS400, Toyota Cressida, and Toyota Supra rear applications, this seal is sized for specific OE-style service needs. The FAG SS4438 is a direct-fit sealing solution for vehicles that require precise bore and outside diameter dimensions.

Key Features

• Part number: SS4438
• Seal type: metal, spring, auxiliary lip
• Sealing material: nitrile
• Bore diameter: 2.756 in. / 70.002 mm
• Seal outside diameter: 2.761 in. / 70.129 mm
• Seal width: 1.693 in. / 43.002 mm
• Designed for rear differential sealing applications

Detailed Description

FAG designs wheel and axle seals to meet vehicle-specific requirements, with attention to contamination control and lubricant retention over the life of the bearing or sealed component. The SS4438 uses a spring-loaded sealing profile and auxiliary lip to support a tighter sealing interface, while the nitrile material provides the flexibility commonly needed in driveline sealing service. This part cross-references National 710142 and Remy 16917 for the same application.

Fits 2013-2019 Subaru BRZ, rear. Fits 2001-2005 Lexus IS300, rear. Fits 1990-1992 Lexus LS400, rear. Fits 1989-1992 Toyota Cressida, rear. Fits 1987-1992 Toyota Supra, rear. Fits 1988 Toyota Cressida, rear. Fits 1987 Toyota Cressida, rear.

Common Problems This Seal Can Address

• Rear differential fluid seepage at the seal surface
• Contamination from road dirt, dust, or moisture entering the axle area
• Loss of grease or lubricant from the bearing/seal interface
• Wear-related sealing issues on aging rear driveline components
• Service replacement for a damaged or hardened original seal

Installation Notes and Tips

Confirm the bore diameter, outside diameter, and seal width before installation to ensure the correct match for the axle housing. Inspect the shaft or hub sealing surface for scoring, corrosion, or wear that could affect sealing performance. Clean the mating surfaces thoroughly and install the seal squarely to avoid distortion of the lip or spring.

For Subaru BRZ rear differential seal replacement, Lexus IS300 rear axle service, or Toyota Supra rear seal repair, verify the application by year and position before ordering. The SS4438 is intended for specific rear applications only.

Quality Assurance

FAG sources seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS4438 is engineered for demanding wheel-end and driveline sealing requirements where contamination control and lubricant retention matter.