National 710304 Steering Knuckle Seal - Front or Front Lower

Steering Knuckle Seal for Front Lower Applications

National 710304 is a steering knuckle seal built for front lower axle applications that require a precise oil seal fit. It is made from nitrile and sized for a 65.100 mm housing bore, 37.570 mm shaft, and 11.940 mm width to support a controlled seal interface in service.

National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and durable sealing materials. The National 710304 is a direct-fit style oil seal for select Ford, Dodge, Chevrolet, and GMC front lower steering knuckle applications.

Key Features

• Part number: 710304
• Steering knuckle seal / oil seal design
• Nitrile construction for sealing performance
• Housing bore: 2.563 in. / 65.100 mm
• Outside diameter: 2.567 in. / 65.200 mm
• Shaft size: 1.479 in. / 37.570 mm
• Width: 0.470 in. / 11.940 mm
• Fits front lower positions and front axle applications listed below

Application Details

Compatible With select front lower steering knuckle applications on Dodge W250, Dodge W350, Chevrolet V3500, Ford F-350, GMC V3500, Chevrolet V30, Chevrolet K30, GMC K3500, Dodge W200, Dodge W300, Ford F-250, and Ford F-350. This part cross-references Four Seasons 37306 for the same application.

• Fits 1981-1993 Dodge W250, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1981-1993 Dodge W350, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1989-1991 Chevrolet V3500, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1985-1991 Ford F-350, Front Lower, with Spicer 60-7F Axle(s); with 9.75 (in) Ring Gear
• Fits 1987-1991 GMC V3500, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1987-1988 Chevrolet V30, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1977-1986 Chevrolet K30, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1979-1986 GMC K3500, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1975-1980 Dodge W200, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1975-1980 Dodge W300, Front Lower, with Spicer 60-F Axle(s); with 9.75 (in) Ring Gear
• Fits 1978-1979 Ford F-250, Front Lower, with Spicer 60-3F Axle(s); with 9.75 (in) Ring Gear
• Fits 1978-1979 Ford F-350, Front Lower, with Spicer 60-3F Axle(s); with 9.75 (in) Ring Gear
• Fits 1964-1975 Ford F-250, Front, with Spicer 44-6CFHD Axle(s); with 8.5 (in) Ring Gear
• Fits 1964-1975 Ford F-350, Front, with Spicer 44-6CFHD Axle(s); with 8.5 (in) Ring Gear

Common Problems This Seal Can Address

• Oil leakage at the steering knuckle or axle seal area
• Contamination entering the sealed joint
• Wear-related seepage around the shaft interface
• Loss of sealing performance from an aged or hardened seal
• Service issues on front lower axle assemblies that use the listed dimensions

Installation Notes and Tips

Verify housing bore, shaft diameter, width, and axle configuration before installation. Confirm the vehicle’s axle type and ring gear specification against the fitment notes, especially on Ford F-250, Ford F-350, and Dodge W-series applications. Clean the sealing surface thoroughly and inspect the shaft and bore for wear or scoring before installing National 710304.

Quality Assurance

National has focused on premium sealing solutions for more than 75 years, with engineering that tracks current vehicle requirements. The National 710304 is built to the listed dimensions and material specification for consistent sealing performance in the applications shown.