National 472635 Transfer Case Output Shaft Seal - Front or Rear

Transfer Case Output Shaft Seal for Spicer 18 Applications

National 472635 is a transfer case output shaft seal built for sealing the output shaft area in select 4WD transfer case applications. It uses nitrile sealing material and a Redicoat finish to support a secure seal at the housing bore and shaft interface.

With dimensions of 1.552 in. shaft diameter, 2.506 in. outside diameter, and 0.500 in. width, this National oil seal is sized for specific transfer case service needs. It is a direct-fit sealing component for vehicles such as Chevrolet Blazer, GMC Jimmy, and Jeep CJ5 applications listed below.

Key Features

• Transfer case output shaft seal for drivetrain sealing service
• Nitrile sealing material for oil resistance in transfer case use
• Redicoat finish for installation support and sealing performance
• Inside diameter: 1.552 in. / 39.420 mm
• Outside diameter: 2.506 in. / 63.650 mm
• Width: 0.500 in. / 12.700 mm
• Housing bore: 2.502 in. / 63.550 mm
• National 472635 part number for catalog matching

Detailed Description

National 472635 is an oil seal from National’s 470000 series, engineered for transfer case output shaft sealing where the shaft and housing dimensions must match precisely. The nitrile sealing material is selected for fluid sealing in drivetrain environments, while the 2.506-inch outside diameter and 0.500-inch width help it seat correctly in the specified housing bore. This part cross-references Dayco 15450 for the same application. National has supplied sealing solutions for more than 75 years, and this seal reflects that focus on dimensional accuracy and modern vehicle sealing requirements.

Compatible With 1969-1972 Chevrolet Blazer, front and rear; 1969-1972 Chevrolet K10 Suburban, front and rear; 1969-1972 Chevrolet K20 Suburban, front and rear; 1970-1972 GMC Jimmy, front and rear; and 1959-1970 Jeep CJ5, front and rear applications listed with Spicer 18 transfer case configurations. National 472635 is also referenced in transfer case sealing searches for Chevrolet Blazer, GMC Jimmy, and Jeep CJ5 service work.

Common Problems This Seal Addresses

• Transfer case oil leakage at the output shaft
• Fluid seepage around the housing bore
• Contamination entering the transfer case through a worn seal
• Seal wear from age, heat, and drivetrain movement
• Noise or driveline mess caused by low transfer case fluid

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Inspect the output shaft surface for grooves or corrosion that can affect sealing performance. Clean the bore thoroughly and install the seal squarely to avoid distortion. Confirm the transfer case configuration matches the listed Spicer 18 applications before ordering.

Quality Assurance

National is a long-established sealing brand with a history of supplying premium sealing solutions for drivetrain and engine service. Part number 472635 is built to the listed dimensions and material specifications for accurate fitment in the confirmed applications.