FAG SS4379 Automatic Transmission Seal - Rear

Automatic Transmission Seal for Nissan 300ZX

FAG SS4379 is an automatic transmission seal built with nitrile sealing material and a rubber spring auxiliary-lip design. It is specified for rear applications on select Nissan 300ZX models and is sized for precise sealing performance at the transmission or wheel-end interface, depending on application use.

Compatible with 1991-1995 Nissan 300ZX rear applications, this seal is identified by part number SS4379 and cross-references Remy 14915 for the same application.

Key Features

• Part number: SS4379
• Brand: FAG
• Seal type: Rubber; spring; auxiliary lip
• Sealing material: Nitrile
• Bore diameter: 1.969 in. / 50.013 mm
• Seal outside diameter: 1.975 in. / 50.165 mm
• Seal width: 1.496 in. / 37.998 mm
• Rear application for select Nissan 300ZX models

Product Details

FAG SS4379 is engineered to meet vehicle manufacturer specifications using materials selected for sealing durability and dimensional accuracy. The nitrile construction and auxiliary-lip profile help maintain a controlled seal at the mating surface, while the spring-loaded design supports consistent contact under operating conditions. For Nissan 300ZX rear service, correct seal dimensions are important for maintaining fluid retention and keeping contaminants out of the assembly.

This part cross-references Remy 14915 for the same application. Use SS4379 when servicing 1991-1995 Nissan 300ZX rear positions, excluding Twin Turbo models from 1/91 per the listed fitment notes.

Common Problems This Seal Addresses

• Transmission or axle fluid leakage at the seal interface
• Contamination from dirt, dust, and moisture entering the assembly
• Grease loss from the bearing or sealed component area
• Wear caused by an aging or hardened seal lip
• Noise or drivability concerns related to fluid loss in the rear assembly

Installation Notes and Tips

Verify the bore diameter, outside diameter, and seal width before installation to confirm the seal matches the housing and shaft dimensions. Inspect the sealing surface for scoring, corrosion, or debris, and replace any damaged mating components before assembly. For 1991-1995 Nissan 300ZX rear service, confirm the vehicle is not a Twin Turbo built from 1/91, as noted in the fitment data.

Quality Assurance

FAG designs seals to meet manufacturer specifications and works with suppliers to maintain its quality standards. The seal construction is intended to provide consistent sealing performance for the listed application when installed to the correct dimensions and fitment requirements.