National 710403 Transfer Case Output Shaft Seal - Front or Rear

Transfer Case Output Shaft Seal for 4WD Service

National 710403 is a transfer case output shaft seal built for vehicles that rely on a Borg-Warner transfer case. It uses nitrile sealing material and OE-style dimensions to support a precise seal at the output shaft area. This part number 710403 is used across a wide range of Ford Ranger, Explorer, and related 4WD applications.

Key Features

• Transfer case output shaft seal / oil seal
• Nitrile sealing material for dependable fluid sealing
• Inside diameter: 1.625 in. (41.270 mm)
• Outside diameter: 2.444 in. (62.080 mm)
• Thickness / width: 0.472 in. (12.000 mm)
• Housing bore: 2.440 in. (61.980 mm)
• National 710403 and series 710400 dimensions

Detailed Description

National 710403 is an output shaft seal for transfer cases that require a 1.625-inch shaft diameter and a 2.440-inch housing bore. The nitrile sealing surface is specified for transfer case sealing applications where fluid retention and shaft interface control are critical. National has supplied sealing solutions for more than 75 years, and its engineering focus tracks current vehicle sealing requirements. This part cross-references Remy 16485 and Bosch 16043 for the same application.

Compatible With Ford Ranger, Ford Explorer, Ford Explorer Sport Trac, Mazda B4000, Mazda B3000, Mercury Mountaineer, and other listed 4WD platforms using Borg-Warner transfer cases. National 710403 is also listed for Kia Sorento, Hyundai Santa Fe, Mercedes-Benz ML320, ML350, ML430, ML500, ML55 AMG, Isuzu Trooper, Axiom, Rodeo, VehiCROSS, Acura SLX, Lincoln Aviator, and Mazda Navajo/B2300/B3000/B4000 applications where the specified transfer case and position match.

What This Seal Helps Address

• Transfer case fluid seepage at the output shaft
• Oil leakage around the housing bore
• Contamination from worn or hardened sealing surfaces
• Loss of fluid level in Borg-Warner transfer case assemblies
• Service issues during transfer case reseal repairs

Installation Notes and Tips

Verify shaft diameter, housing bore, and transfer case model before installation. Clean the bore and shaft sealing surface thoroughly, and inspect for grooves, corrosion, or wear that could affect sealing performance. Confirm the vehicle position listed in the fitment data, since this seal is used in front, rear, and N/A applications depending on the transfer case configuration. For Ford Ranger and Ford Explorer service, match the Borg-Warner transfer case number and drivetrain setup exactly to the vehicle listing.

Quality Assurance

National builds sealing products with long-standing industry experience and application-focused engineering. Part number 710403 is manufactured to the dimensional specifications shown above for transfer case output shaft service.