FAG SS3634 Transfer Case Shift Shaft Seal

Transfer Case Shift Shaft Seal for Ford and Mazda

FAG SS3634 is a transfer case shift shaft seal built with a metal and spring design and nitrile sealing material for controlled sealing performance. It is specified for a wide range of Ford, Lincoln, Mercury, Mazda, and Cadillac applications, including many Warner transfer case setups.

This part cross-references National 330385 for the same application.

Key Features

• Part number: SS3634
• Transfer case shift shaft seal for sealing the shift shaft area
• Metal and spring seal construction
• Nitrile sealing material
• Bore diameter: 0.749 in. / 19.025 mm
• Seal outside diameter: 0.753 in. / 19.126 mm
• Seal width: 0.375 in. / 6.35 mm
• Fits many Warner transfer case applications across Ford truck and SUV platforms

Detailed Description

FAG SS3634 is engineered to seal the transfer case shift shaft and help maintain proper sealing at the transfer case housing. The metal and spring design supports consistent contact, while the nitrile sealing material is selected for sealing performance in drivetrain environments. With precise dimensions and application-specific fitment, this seal is used on a broad range of vehicles including Ford Expedition, Ford F-150, Ford Ranger, Ford Explorer, Lincoln Navigator, Mercury Mountaineer, Mazda B-series trucks, and Cadillac SRX. If you are servicing a Ford F-150 transfer case, Ford Explorer transfer case, or Mazda B4000 drivetrain, SS3634 is a direct-fit service part for the listed applications.

What It Helps Fix

• Transfer case fluid seepage at the shift shaft
• Contamination entering the transfer case through a worn seal
• Loss of lubricant around the shift shaft area
• Rough or inconsistent sealing caused by age, heat, or wear
• Service issues on Warner transfer case applications in Ford and Mazda vehicles

Installation Notes and Tips

Verify the transfer case type and seal dimensions before installation. Clean the bore and shaft area thoroughly, and inspect the shaft surface for wear, scoring, or corrosion that could affect sealing. Confirm the vehicle application against the listed fitment for your Ford Expedition, Ford F-150, Ford Explorer, or related model before ordering. Proper seating and alignment are important to avoid leaks after service.

Quality Assurance

FAG seals are produced with high-quality materials and built to meet vehicle manufacturer specifications for the listed applications. The design focus is on protecting drivetrain components from dirt, dust, and moisture while helping retain lubricant over the service life of the bearing and seal assembly.