FAG SS3111 Transfer Case Output Shaft Seal - Front or Rear

Transfer Case Output Shaft Seal for Ford Applications

The FAG SS3111 transfer case output shaft seal is built for Ford trucks and SUVs that use New Process 203 and 205 transfer cases. It is specified for front and rear positions on select Bronco, F-100, F-150, F-250, and F-350 applications, including 1978-1979 Ford Bronco and 1979 Ford truck models.

• Part number: FAG SS3111
• Transfer case output shaft seal for front or rear position applications
• Seal type: metal, spring, inner shell
• Sealing material: Viton
• Bore diameter: 3.061 in / 77.749 mm
• Seal outside diameter: 3.066 in / 77.876 mm
• Seal width: 2.125 in / 53.975 mm
• Cross-reference: Gates 21215

Detailed Fitment and Construction

FAG SS3111 is a transfer case output shaft seal engineered to help retain lubricant at the transfer case output while keeping dirt, dust, and moisture away from internal components. The Viton sealing material and metal spring inner-shell design support a precise sealing interface for the specified Ford Bronco and Ford truck transfer case applications. This part number, SS3111, also cross-references OE-style global number 4133111100 for the same application.

Compatible With 1978-1979 Ford Bronco, front and rear; 1979 Ford F-100, front and rear; 1979 Ford F-150, front and rear; 1979 Ford F-250, front and rear; and 1979 Ford F-350, front and rear. It also aligns with 1953-1958 Ford F-350 rear applications listed in the fitment data.

What This Seal Helps Address

• Transfer case fluid seepage at the output shaft
• Contamination from road dirt, dust, and moisture
• Loss of grease or lubricant around the bearing area
• Wear related to an aging or hardened seal lip
• Service issues on Ford Bronco and Ford truck transfer case assemblies

Installation Notes and Tips

Verify transfer case model, shaft dimensions, and seal orientation before installation. Match the bore diameter, outside diameter, and width to the housing and shaft specification, and inspect the shaft surface for grooves or corrosion that can affect sealing performance. Clean the bore thoroughly and seat the seal evenly to avoid distortion.

Quality Assurance

FAG designs seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS3111 uses materials selected for demanding sealing service in transfer case applications, including Viton for the sealing element.